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Cermak J.,University of Waterloo | Stephenson G.,University of Waterloo | Stephenson G.,Stantec Consulting Ltd. | Birkholz D.,ALS Laboratory Group | Dixon D.G.,University of Waterloo
Environmental Toxicology and Chemistry | Year: 2013

Petroleum hydrocarbons (PHCs) act via narcosis and are expected to have additive toxicity. However, previous work has demonstrated less-than-additive toxicity with PHC distillates and earthworms. A study was initiated to investigate this through toxicity and toxicokinetic studies with the earthworm Eisenia andrei. Three petroleum distillate fractions, F2 (>C10-C16), F3a (>C16-C23), and F3b (>C23-C34), were used in two binary combinations, F2F3a and F3aF3b. In the toxicity study, clean soil was spiked with equitoxic combinations of the two distillates ranging from 0.5 to 2.5 toxic units. In the toxicokinetic study, a binary combination consisting of one concentration of each distillate was used. On a soil concentration basis, the toxicity of the binary combinations of distillates was less than additive. Accumulation of the individual distillates, however, was generally reduced when a second distillate was present, resulting in lower body burden. This is thought to be due to the presence of a nonaqueous-phase liquid at the soil concentrations used. On a tissue concentration basis, toxicity was closer to additive. The results demonstrate that tissue concentrations are the preferred metric for toxicity for earthworms. They also demonstrate that the Canada-wide soil standards based on individual distillates are likely protective. © 2013 SETAC.


Cermak J.H.,University of Waterloo | Cermak J.H.,Environment Canada | Stephenson G.L.,University of Waterloo | Stephenson G.L.,Stantec Inc. | And 3 more authors.
Environmental Toxicology and Chemistry | Year: 2010

Canadian standards for petroleum hydrocarbons in soil are based on four distillate ranges (F1, C6-C10; F2, >C10-C16; F3, >C16-C34; and F4, >C34). Concerns have arisen that the ecological soil contact standards for F3 may be overly conservative. Oil distillates were prepared and characterized, and the toxicity of F3 and two subfractions, F3a (>C16-C23) and F3b (>C23-C34), to earthworms (Eisenia andrei), springtails (Orthonychiurus folsomi), and northern wheatgrass (Elymus lanceolatus), as well as the toxicity of F2 to earthworms, was determined. Clean soil was spiked with individual distillates and measured concentrations were determined for select tests. Results agree with previous studies with these distillates. Reported toxicities of crude and petroleum products to invertebrates were generally comparable to that of F3 and F3a. The decreasing order of toxicity was F3a > F3 > F3b with invertebrates, and F3a > F3b > F3 with plants. The toxicities of F3a and F3b were not sufficiently different to recommend regulating hydrocarbons based on these distillate ranges. The results also suggest that test durations may be insufficient for determining toxicity of higher distillate ranges, and that the selection of species and endpoints may significantly affect interpretation of toxicity test results. © 2010 SETAC.


VANCOUVER, BC / ACCESSWIRE / November 30, 2016 / Vendetta Mining Corp. (TSXV: VTT) (the "Company") is pleased to announce further high grade drill results from the 2016 program at the Pegmont Lead-Zinc Project in Queensland, Australia. The last holes in the 2016 resource development program continued the previous work in Zone 5 and on the Zone 2-3 "Z" fold. PVRD052A: 14.77 metres of 11.91% Pb+Zn (5.46% Pb, 6.45% Zn); and 4.35 metres of 11.85% Pb+Zn (5.01% Pb, 6.84% Zn); and 5.05 metres of 10.32% Pb+Zn (4.52% Pb, 5.80% Zn). PVRD035B: 14.73 metres of 12.41% Pb+Zn (9.02% Pb, 3.39% Zn); and 10.32 metres of 11.94% Pb+Zn (9.64% Pb, 2.31% Zn); and PVRD053: 7.49 metres of 11.51% Pb+Zn (8.10% Pb, 3.41% Zn). A full summary of the lead-zinc assay results including true widths is provided in Table 1 on page 3. Michael Williams, Vendetta's President and CEO commented, "The progress at the Pegmont project has been significant. We have successfully confirmed the shallow potential of the Burke Hinge Zone, discovered a high grade fold between Zones 2 and 3, we are able to successfully target mineralization in Zone 5, and in doing so have validated the geological model of zinc grade increasing to the west. We look forward to receipt of the metallurgical test work, updating the NI 43-101 resource which we intend to release early next year and the commencement of the 2017 program in Q1." The Company continued resource development drilling in Zone 5, an underground target, comprising 3 known stacked Lenses; A, B and C. Lens B is the most significant, with Lens C becoming increasingly valuable as drilling moves to the South-West. Mineralization in Lens A is sporadic, however grades also appear to be improving to the South-West. Drill hole PVRD052A was drilled 40 m along strike of the high-grade step-out hole PVRD017 (4.56 m @ 5.45% Pb, 10.15% Zn), it successfully intersected Lens B and C. PVRD052A, was the most southwestern hole drilled during the 2016 program and importantly zinc grades continued to exceeded lead. Drill hole PVRD051 targeted Anticline C but didn't intersect the host lithology, interpretation in this area is ongoing. In drill hole PVRD050 excessive deviation caused drilling difficulties and resulted in the hole being terminated before target depth; it did however, intersect low grade mineralization which is interpreted to be Lens A. Drill hole PVRD054 was drilled to intersect the steep northern limb of Syncline C, however, the hole path didn't flatten as expected. The hole did intersect two mineralized horizons, interpreted to be Lenses C and possibly a new fourth Lens. The Company continued to test the newly identified high-grade "Z" fold between Zones 2 and 3, drilling a second section located 350 m along strike to the north east of the previously announced hole PVRD046 (11.0 m @ 7.84% Pb, 3.18% Zn) which intersected the lower fold in Zone 3. The Zone 2-3 "Z" fold is a site of structural thickening and elevated grades. Up dip from the "Z" fold the mineralized host is structurally thinned over a distance of about 50 to 75 m, before mineralization of greater than 5 m thickens returns in the Zone 2 open pit target area. The Zone 2 "Z" fold hinge is interpreted to be a flat lying shoot, approximately 50 to 60 m wide, with a total strike potential of over 700 m. Drill hole PVRD053 successfully targeted the upper fold in Zone 2. Only one historic drill hole is interpreted to be in this structural position, PMR091 (6 m @ 10.19% Pb, 2.81% Zn). PVRD053 will be extended during the next program to test the over turned limb of the "Z" and on into the flat dipping portion of Zone 3. Drill hole PVRD035B successfully targeted the lower Zone 3 portion of the fold. It is now understood that historic holes PGD023 (18.8 m at 9.48% Pb, 3.53% Zn) and PMRD124 (9.54 m at 9.25% Pb, 3.07% Zn) intersected the lower portion of the "Z" fold in Zone 3. Drill holes PVRD048 and PVRD049 tested the limits of Zone 3, near the position where Zone 3 is intersected by the Amphibolite Dyke. PVRD049 intersected thin mineralization interpreted to be on a fold limb. PVRD048 failed to intersect significant mineralization, however it may be extended in the future. As part of the 2016 drilling program, a total of 17 historic drill holes were down hole surveyed using a true north seeking gyroscope, improving the confidence in the position of this data. To date a total of 30 historic holes have been re-logged. Metallurgical test work at ALS Metallurgy in Burnie, Tasmania is ongoing. Results are expected early in 2017 and will be released when they are finalized. Other ongoing activities include the interpretation of the recent drill data at Pegmont. The Company expects to deliver an updated NI 43-101 resource estimate, including for the first time Zone 5 and the Burke Hinge Zone early in 2017. Planning of the 2017 program is progressing and will include continued resource development drilling in Zone 5 and on the Zone 2 - 3 "Z" fold, as well as performing a surface EM survey over the recently discovered copper target; see Vendetta news release 19th October 2016. Table 1. Summary of the Final Assay Results from the 2016 Program. *True thickness estimate is based on three dimensional geological modeling, except where indicated as an estimate. #Drill intersections are summarized using a combined 1% lead plus zinc grade, over a 1 m minimum down hole intersection length, higher grade intervals included are reported at a 5% lead plus zinc grade. The drilling at Zone 5 involved drilling RC pre-collars using a 5.75 inch diameter face sampling bit to depth prior to casing and continuing the hole in HQ2 diamond core. Diamond core samples were taken on nominal 1 m lengths but varied to match geological contacts. Samples of the core are obtained using a diamond saw to half cut the core, if the hole is to be included in metallurgical test work it is then halved again. This was performed to provide sufficient sample for metallurgical test work while retaining a permanent core record. Field duplicate samples were taken and blanks and commercially prepared certified reference materials (standards) were added into the sample sequence for every hole submitted. These were analyzed by the Company and no issues were noted with analytical accuracy or precision. Samples used for the results described herein were prepared and analyzed at ALS Laboratory Group in Townsville, Queensland. Analysis was undertaken using a four acid digest and ICP (ALS method: ME-ICP61 for Pb, Zn, Ag, Fe, Mn, Cd and S) with over limit (>10,000 ppm lead and zinc and >100 ppm silver) high grade samples being read with an atomic absorption spectrometer (AAS), (ALS methods: Pb-OG62, Zn-OG62, and Ag-OG62). Drill hole collar positions have been surveyed by a licensed surveyor. Down hole surveys were undertaken using a true north seeking gyroscope with stations every 6 or 10 m. All HQ2 diamond core is orientated using digital core orientation systems and this data is incorporated into the 3D interpretations. Assay intervals shown in Table 1 are down hole intervals, and the true thickness noted are based on 3D interpretations of the host lithology, structure, and mineralization. Pegmont is a stratiform, Broken Hill-Type deposit that outcrops with an overall shallow dip to the south east and is hosted in a magnetite-rich banded iron formation within high grade metamorphic rocks. The project consists of three granted mining leases and two exploration permits that cover an area of approximately 3,468 ha. The current NI 43-101 mineral resource estimate is given in Table 2. Over 13,500 m of drilling will be incorporated into an updated resource estimate. *Reference: "Technical Report Pegmont Property Mineral Resource Estimate" AMC Mining Consultants (Canada) Ltd, effective date of 28 February 2014. The Technical Report is available on SEDAR. CIM definitions were used for the Mineral Resources. The cut-off grade applied to the oxide and transition Mineral Resources is 3% Pb + Zn, the sulphide cut-off grade is 5% Pb + Zn. Cut off is based on $0.90 /lb for Pb and Zn, a $0.90 A$:US$ exchange rate, and 90% recovery for both metals. Specific gravity used by oxidation state: 3.2 t/m3 oxide, 3.4 t/m3 transition and 3.9 t/m3 sulphide. Vendetta Mining Corp. is a Canadian junior exploration company engaged in acquiring, exploring, and developing mineral properties with an emphasis on lead and zinc. It is currently focused on advanced stage exploration projects in Australia, the first of which is the recently optioned Pegmont Lead Zinc project. Additional information on the Company can be found at www.vendettaminingcorp.com. Peter Voulgaris, MAusIMM, MAIG, a Director of Vendetta, is a non-independent qualified person as defined by NI 43-101. Mr. Voulgaris has reviewed the technical content of this press release, and consents to the information provided in the form and context in which it appears. ON BEHALF OF THE BOARD OF DIRECTORS The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this release. Certain statements within this news release, other than statements of historical fact relating to Vendetta Mining Corp., are to be considered forward-looking statements with respect to the Company's intentions for its Pegmont project in Queensland, Australia. Forward-looking statements include statements that are predictive in nature, are reliant on future events or conditions, or include words such as "expects," "anticipates," "plans," "believes," "considers," "significant," "intends," "targets," "estimates," "seeks," "attempts," "assumes," and other similar expressions. The forward-looking statements are based on a number of assumptions which, while considered reasonable by Vendetta Mining Corp., are, by their nature, subject to inherent risks and uncertainties and are not guarantees of future performance. Factors that could cause actual results to differ materially from those in forward-looking statements include: the interpretation of current results from the 2016 drilling program mentioned in this news release, further results from the 2016 drilling program, the accuracy of exploration results, the accuracy of Mineral Resource Estimates, the anticipated results of future exploration, the forgoing ability to finance further exploration, delays in the completion of exploration, delays in the completion of the updated Mineral Resource Estimate, the future prices of lead, zinc, and other metals, and general economic, market and/or business conditions. There can be no assurances that such statements and assumptions will prove accurate and, therefore, readers of this news release are advised to rely on their own evaluation of the information contained within. In addition to the assumptions herein, these assumptions include the assumptions described in Vendetta Mining Corp.'s Management's Discussion and Analysis for the nine months ended, February 29th, 2016. Although Vendetta Mining Corp. has attempted to identify important risks, uncertainties and other factors that could cause actual performance, achievements, actions, events, results or conditions to differ materially from those expressed in or implied by the forward-looking statements, there may be other risks, uncertainties and other factors that cause future performance to differ from what is anticipated, estimated or intended. Unless otherwise indicated, forward-looking statements contained herein are as of the date hereof and Vendetta Mining Corp. does not assume any obligation to update any forward-looking statements after the date on which such statements were made, except as required by applicable law. VANCOUVER, BC / ACCESSWIRE / November 30, 2016 / Vendetta Mining Corp. (TSXV: VTT) (the "Company") is pleased to announce further high grade drill results from the 2016 program at the Pegmont Lead-Zinc Project in Queensland, Australia. The last holes in the 2016 resource development program continued the previous work in Zone 5 and on the Zone 2-3 "Z" fold. PVRD052A: 14.77 metres of 11.91% Pb+Zn (5.46% Pb, 6.45% Zn); and 4.35 metres of 11.85% Pb+Zn (5.01% Pb, 6.84% Zn); and 5.05 metres of 10.32% Pb+Zn (4.52% Pb, 5.80% Zn). PVRD035B: 14.73 metres of 12.41% Pb+Zn (9.02% Pb, 3.39% Zn); and 10.32 metres of 11.94% Pb+Zn (9.64% Pb, 2.31% Zn); and PVRD053: 7.49 metres of 11.51% Pb+Zn (8.10% Pb, 3.41% Zn). A full summary of the lead-zinc assay results including true widths is provided in Table 1 on page 3. Michael Williams, Vendetta's President and CEO commented, "The progress at the Pegmont project has been significant. We have successfully confirmed the shallow potential of the Burke Hinge Zone, discovered a high grade fold between Zones 2 and 3, we are able to successfully target mineralization in Zone 5, and in doing so have validated the geological model of zinc grade increasing to the west. We look forward to receipt of the metallurgical test work, updating the NI 43-101 resource which we intend to release early next year and the commencement of the 2017 program in Q1." The Company continued resource development drilling in Zone 5, an underground target, comprising 3 known stacked Lenses; A, B and C. Lens B is the most significant, with Lens C becoming increasingly valuable as drilling moves to the South-West. Mineralization in Lens A is sporadic, however grades also appear to be improving to the South-West. Drill hole PVRD052A was drilled 40 m along strike of the high-grade step-out hole PVRD017 (4.56 m @ 5.45% Pb, 10.15% Zn), it successfully intersected Lens B and C. PVRD052A, was the most southwestern hole drilled during the 2016 program and importantly zinc grades continued to exceeded lead. Drill hole PVRD051 targeted Anticline C but didn't intersect the host lithology, interpretation in this area is ongoing. In drill hole PVRD050 excessive deviation caused drilling difficulties and resulted in the hole being terminated before target depth; it did however, intersect low grade mineralization which is interpreted to be Lens A. Drill hole PVRD054 was drilled to intersect the steep northern limb of Syncline C, however, the hole path didn't flatten as expected. The hole did intersect two mineralized horizons, interpreted to be Lenses C and possibly a new fourth Lens. The Company continued to test the newly identified high-grade "Z" fold between Zones 2 and 3, drilling a second section located 350 m along strike to the north east of the previously announced hole PVRD046 (11.0 m @ 7.84% Pb, 3.18% Zn) which intersected the lower fold in Zone 3. The Zone 2-3 "Z" fold is a site of structural thickening and elevated grades. Up dip from the "Z" fold the mineralized host is structurally thinned over a distance of about 50 to 75 m, before mineralization of greater than 5 m thickens returns in the Zone 2 open pit target area. The Zone 2 "Z" fold hinge is interpreted to be a flat lying shoot, approximately 50 to 60 m wide, with a total strike potential of over 700 m. Drill hole PVRD053 successfully targeted the upper fold in Zone 2. Only one historic drill hole is interpreted to be in this structural position, PMR091 (6 m @ 10.19% Pb, 2.81% Zn). PVRD053 will be extended during the next program to test the over turned limb of the "Z" and on into the flat dipping portion of Zone 3. Drill hole PVRD035B successfully targeted the lower Zone 3 portion of the fold. It is now understood that historic holes PGD023 (18.8 m at 9.48% Pb, 3.53% Zn) and PMRD124 (9.54 m at 9.25% Pb, 3.07% Zn) intersected the lower portion of the "Z" fold in Zone 3. Drill holes PVRD048 and PVRD049 tested the limits of Zone 3, near the position where Zone 3 is intersected by the Amphibolite Dyke. PVRD049 intersected thin mineralization interpreted to be on a fold limb. PVRD048 failed to intersect significant mineralization, however it may be extended in the future. As part of the 2016 drilling program, a total of 17 historic drill holes were down hole surveyed using a true north seeking gyroscope, improving the confidence in the position of this data. To date a total of 30 historic holes have been re-logged. Metallurgical test work at ALS Metallurgy in Burnie, Tasmania is ongoing. Results are expected early in 2017 and will be released when they are finalized. Other ongoing activities include the interpretation of the recent drill data at Pegmont. The Company expects to deliver an updated NI 43-101 resource estimate, including for the first time Zone 5 and the Burke Hinge Zone early in 2017. Planning of the 2017 program is progressing and will include continued resource development drilling in Zone 5 and on the Zone 2 - 3 "Z" fold, as well as performing a surface EM survey over the recently discovered copper target; see Vendetta news release 19th October 2016. Table 1. Summary of the Final Assay Results from the 2016 Program. *True thickness estimate is based on three dimensional geological modeling, except where indicated as an estimate. #Drill intersections are summarized using a combined 1% lead plus zinc grade, over a 1 m minimum down hole intersection length, higher grade intervals included are reported at a 5% lead plus zinc grade. The drilling at Zone 5 involved drilling RC pre-collars using a 5.75 inch diameter face sampling bit to depth prior to casing and continuing the hole in HQ2 diamond core. Diamond core samples were taken on nominal 1 m lengths but varied to match geological contacts. Samples of the core are obtained using a diamond saw to half cut the core, if the hole is to be included in metallurgical test work it is then halved again. This was performed to provide sufficient sample for metallurgical test work while retaining a permanent core record. Field duplicate samples were taken and blanks and commercially prepared certified reference materials (standards) were added into the sample sequence for every hole submitted. These were analyzed by the Company and no issues were noted with analytical accuracy or precision. Samples used for the results described herein were prepared and analyzed at ALS Laboratory Group in Townsville, Queensland. Analysis was undertaken using a four acid digest and ICP (ALS method: ME-ICP61 for Pb, Zn, Ag, Fe, Mn, Cd and S) with over limit (>10,000 ppm lead and zinc and >100 ppm silver) high grade samples being read with an atomic absorption spectrometer (AAS), (ALS methods: Pb-OG62, Zn-OG62, and Ag-OG62). Drill hole collar positions have been surveyed by a licensed surveyor. Down hole surveys were undertaken using a true north seeking gyroscope with stations every 6 or 10 m. All HQ2 diamond core is orientated using digital core orientation systems and this data is incorporated into the 3D interpretations. Assay intervals shown in Table 1 are down hole intervals, and the true thickness noted are based on 3D interpretations of the host lithology, structure, and mineralization. Pegmont is a stratiform, Broken Hill-Type deposit that outcrops with an overall shallow dip to the south east and is hosted in a magnetite-rich banded iron formation within high grade metamorphic rocks. The project consists of three granted mining leases and two exploration permits that cover an area of approximately 3,468 ha. The current NI 43-101 mineral resource estimate is given in Table 2. Over 13,500 m of drilling will be incorporated into an updated resource estimate. *Reference: "Technical Report Pegmont Property Mineral Resource Estimate" AMC Mining Consultants (Canada) Ltd, effective date of 28 February 2014. The Technical Report is available on SEDAR. CIM definitions were used for the Mineral Resources. The cut-off grade applied to the oxide and transition Mineral Resources is 3% Pb + Zn, the sulphide cut-off grade is 5% Pb + Zn. Cut off is based on $0.90 /lb for Pb and Zn, a $0.90 A$:US$ exchange rate, and 90% recovery for both metals. Specific gravity used by oxidation state: 3.2 t/m3 oxide, 3.4 t/m3 transition and 3.9 t/m3 sulphide. Vendetta Mining Corp. is a Canadian junior exploration company engaged in acquiring, exploring, and developing mineral properties with an emphasis on lead and zinc. It is currently focused on advanced stage exploration projects in Australia, the first of which is the recently optioned Pegmont Lead Zinc project. Additional information on the Company can be found at www.vendettaminingcorp.com. Peter Voulgaris, MAusIMM, MAIG, a Director of Vendetta, is a non-independent qualified person as defined by NI 43-101. Mr. Voulgaris has reviewed the technical content of this press release, and consents to the information provided in the form and context in which it appears. ON BEHALF OF THE BOARD OF DIRECTORS The TSX Venture Exchange does not accept responsibility for the adequacy or accuracy of this release. Certain statements within this news release, other than statements of historical fact relating to Vendetta Mining Corp., are to be considered forward-looking statements with respect to the Company's intentions for its Pegmont project in Queensland, Australia. Forward-looking statements include statements that are predictive in nature, are reliant on future events or conditions, or include words such as "expects," "anticipates," "plans," "believes," "considers," "significant," "intends," "targets," "estimates," "seeks," "attempts," "assumes," and other similar expressions. The forward-looking statements are based on a number of assumptions which, while considered reasonable by Vendetta Mining Corp., are, by their nature, subject to inherent risks and uncertainties and are not guarantees of future performance. Factors that could cause actual results to differ materially from those in forward-looking statements include: the interpretation of current results from the 2016 drilling program mentioned in this news release, further results from the 2016 drilling program, the accuracy of exploration results, the accuracy of Mineral Resource Estimates, the anticipated results of future exploration, the forgoing ability to finance further exploration, delays in the completion of exploration, delays in the completion of the updated Mineral Resource Estimate, the future prices of lead, zinc, and other metals, and general economic, market and/or business conditions. There can be no assurances that such statements and assumptions will prove accurate and, therefore, readers of this news release are advised to rely on their own evaluation of the information contained within. In addition to the assumptions herein, these assumptions include the assumptions described in Vendetta Mining Corp.'s Management's Discussion and Analysis for the nine months ended, February 29th, 2016. Although Vendetta Mining Corp. has attempted to identify important risks, uncertainties and other factors that could cause actual performance, achievements, actions, events, results or conditions to differ materially from those expressed in or implied by the forward-looking statements, there may be other risks, uncertainties and other factors that cause future performance to differ from what is anticipated, estimated or intended. Unless otherwise indicated, forward-looking statements contained herein are as of the date hereof and Vendetta Mining Corp. does not assume any obligation to update any forward-looking statements after the date on which such statements were made, except as required by applicable law.


News Article | February 22, 2017
Site: www.marketwired.com

- 4,936 meters completed to date in 11 diamond drill holes in the Douay West, Main Porphyry and "20" zones of the Adam Creek Gold Deposit - 2017 gold assay interval results include: 2.11 g/t gold over 20.6 meters (DO-16-147), 2.20 g/t gold over 23.1 meters (DO-16-149) and 3.53 g/t over 4.5 meters (DO-17-151) - 2nd drill mobilized on site with plans to mobilize additional drills in coming weeks MONTREAL, QUEBEC--(Marketwired - Feb. 22, 2017) - Aurvista Gold Corporation ("Aurvista" or the "Company") (TSX VENTURE:AVA)(OTCQB:ARVSF)(FRANKFURT:AV2) is pleased to update shareholders and stakeholders on the advancement of the 30,000 meters diamond drilling campaign from the Company's Douay Gold Project ("Douay"). To date, some 4,936 meters have been drilled in 11 diamond drill holes (DO-16-147 to 149, and DO-17-150 to 157) in the Douay West, Main Porphyry and "20" zones of the Adam Creek Gold Deposit (the "Deposit") (refer to appended Figure 1). Unfortunately, the sequencing of drill holes was set by warmer weather conditions which are unfavorable to drilling under wet conditions; drill holes with the easiest winter surface access were done first. Keith Minty, COO of Aurvista, stated "Aurvista's diamond drilling campaign is progressing on schedule with two core drills now on site. Plans are to accelerate the campaign as two new wood-cutting permits were issued for a total of 43 proposed drill holes. We will be adding more drills in the coming weeks to test the horizontal and vertical extensions of a number of targets: (1) the Main Porphyry Zone to the northwest towards the NW Zone, over a 1,200 meters strike length; as well as the area beyond the NW Zone for an additional 1,000 meters in strike length; (2) the Adam Porphyry Zone to the east and west-northwest, along an additional trend length of 1,000 meters; (3) the Central, '20' and '10' zones, and their potential connections along east-west mineralized structures and to the Main Porphyry zone, over a 1,500 meter length." Mr. Minty added "The objective of the first drill holes were to prove the new geological model by extending the known mineralization along east-west corridors in proximity to three known gold zones. A limited number of historical drill holes were twinned and new holes were drilled that visually extended the gold mineralization along the corridors and down-dip of previous intersections. The overall objective of the 30,000 meters drilling campaign is to outline additional higher grade mineralization in the range of 3 to 15 g/t gold and the lower grade in the 0.3 to 1.5 g/t gold, as well as increasing the size of several individual gold zones, which when combined could have an impact on increasing mineral resources at Douay." Gold assay interval results are available for the first six drill holes (DO-16-147 to 149, and DO-17-150 to 152) and are shown in the table below. The appended Table 1 summarizes all drill holes statistics and individual gold assays of the interval results. Gold assay interval results received to date confirm predictability and reproducibility of assays, and continuity of gold mineralization from the historical holes as seen in the following table: Significant gold mineralization was intersected in 3 holes: 2.11 g/t gold over 20.6 meters (DO-16-147), 2.20 g/t gold over 23.1 meters (DO-16-149) and 3.53 g/t over 4.5 meters (DO-17-151), all from the Douay West Zone. In addition, the thorough drill core sampling of the 2017 drilling campaign has likely contributed to the identification of new gold mineralization in 4 of these 6 drill holes: 0.56 g/t over 6.4 meters (DO-16-148), 1.05 g/t over 4.5 meters (DO-16-149), 0.89 g/t over 36 meters (DO-17-150), and 0.41 g/t gold over 4.5 meters and 1.51 g/t over 2.7 meters (DO-17-152). This was also observed in 2016 during the re-logging and gold assaying of un-sampled mineralized zones from the historical drill core. The full 2016 gold assay and core re-logging program results will be made available later in the year once all compiled, validated and incorporated in the overall database. The objective of proving the new geological model is being met; new results are extending the known mineralization along the east-west structural corridors and down-dip of previous intersections. In 2016, Aurvista implemented strict Quality Assurance ("QA") and Quality Control ("QC") protocols at Douay covering the planning of and placing drill holes in the field; drilling and retrieving the NQ-sized drill core; drill hole surveying; core transport to the Douay Camp; core logging by qualified personnel; sampling and bagging of core for analysis; transport of core from site to the analytical laboratory; sample preparation for assaying; and analysis, recording and final statistical vetting of results. The complete description of protocols is appended. Aurvista Gold Corporation is a junior gold exploration and development Company with 131,912,407 shares outstanding trading on the TSX Venture Exchange in Canada, the Frankfurt Stock Exchange and OTCQB in the US. Aurvista's asset is the Douay Gold Project, consisting of a 100% owned interest in 250 contiguous claims totaling 133.1 km2, plus a 90% interest in 5 contiguous claims totaling 0.2 km2 and a 75% interest (25% held by SOQUEM) in 32 contiguous claims totaling 11.9 km2. In total there are 287 claims covering 145.3 km2 located along a 20 km segment of the Casa Berardi Deformation Zone in the prolific Abitibi Belt of northern Quebec. Douay is located 40 km SW of the Matagami Base Metal Camp and 150 km N of the Val-d'Or-Malartic gold Camp (both in Quebec). In August, 2012, Aurvista updated the Mineral Resources estimates that included 657 holes in more than 185,000 metres drilled on Douay since its discovery to the end of March 2012. Douay contains base case Mineral Resources of 2.7 million tonnes of Indicated Resources at 2.76 g/t gold for 238,000 ounces above a 0.3 g/t gold cut-off grade. Under a sensitivity analysis cut-off grade of 0.5 g/t gold, the Indicated Resources total 2.5 million tonnes grading 2.98 g/t gold for 235,500 ounces. There were additional base case Inferred Resources of 115 million tonnes at 0.75 g/t gold for 2.75 million ounces above a 0.3 g/t gold cut-off grade. Under a sensitivity analysis cut-off grade of 0.5 g/t gold, the Inferred Resources total 62 million tonnes grading 1.06 g/t gold for 2.1 million ounces. Details can be viewed on the Company's website at www.aurvistagold.com. The technical contents in this news release have been approved by Mr. Jean Lafleur, M. Sc., P. Geo., President and CEO for Aurvista Gold Corporation, and Antoine Yassa, P. Geo., Database Manager for the Douay Gold Project. Both individuals are Qualified Persons under National Instrument 43-101. NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES PROVIDER (AS THAT TERM IS DEFINED IN THE POLICIES OF THE TSX VENTURE EXCHANGE) ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS PRESS RELEASE. This news release may contain forward-looking statements based on assumptions, uncertainties and management's best estimate of future events. Actual events or results could differ materially from the Company's expectations and projections. Investors are cautioned that forward-looking statements involve risks and uncertainties. Accordingly, readers should not place undue reliance on forward-looking statements. When used herein, words such as "anticipate", "will", "intend" and similar expressions are intended to identify forward-looking statements. For a more detailed discussion of such risks and other factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements, refer to Aurvista Gold Corporation's filings with Canadian securities regulators available on www.sedar.com or the Company's website at www.aurvistagold.com. To view Figure 1, please visit the following link: http://media3.marketwire.com/docs/ava0222fig1.pdf. To view Table 1, please visit the following link: http://media3.marketwire.com/docs/ava0222table1.pdf. Drill holes positioning was pre-determined via interpretation on historical drill hole sections and level plans, based on the objectives of adding continuity to the known higher and lower grade gold mineralization at depth and on strike length, and to discover new gold mineralization. Both would have a significant positive impact on the potential of increasing the mineral resources at Douay. Drilling is done along already established grids on pre-defined drill hole sections, ensuring appropriate drill hole spacing between holes and along parallel sections. Drill holes are positioned in the field following current established standards by azimuth orientation and dip with a hand-held or fixed GPS to ensure precision. Originally, a single or multi-shot reflex orientation system was used in order to controls drill hole deviation, especially in areas of thicker overburden and magnetic rocks. A gyroscopic instrument is now recording continuous deviation of the drilled hole. Drill holes a few degrees to the left of the intended azimuth to ensure drill holes will follow the intended section. Prior to and during drilling, the exact position of individual drill holes is verified by the Qualified Geologist in charge of the drill campaign. A down-the-hole deviation test is done once 9 meters has been drilled in bedrock, to ensure the drill hole has not deviated and it remains on course for its intended target depth. Assuming the results of the drill hole do not respect or conform to the technical parameters outlined prior to the drilling, or if the deviation has taken the drill hole outside the normal influence of the vertical section, the drill hole is re-started to ensure the target depth has been reached and explained. Core boxes are brought to the Aurvista core logging and storage facility at the Douay Camp at the end of each shift by the drill contractor. The Qualified Geologist regularly examine the drill core at the drill rig during the day or night to determine if the proposed target has been intersected. The Qualified Geologist instructs the drillers and/or foreman to either continue the drilling or stop the hole. At the completion of each drill hole, the overburden drill rods are left in place on instructions from the Qualified Geologist, and a numbered red cap is placed over the protruding drill rod. The numbered cap is usually accompanied by a 1.5-meter-long red metal spike topped by a red metal flag to indicate the location of the drill hole for future surface surveying. Once core boxes have been received by Aurvista at their core facility, a Qualified Geologist or Technician arranges core boxes on the core facility floor or temporary tables in numeric order from box 1 upwards. Core boxes are then opened and footage blocks are properly checked with the appropriate footages and checked for continuity. The Qualified Technician calculates footages using a measuring tape, making sure the correct footage is written on each footage block, and the end footage for each box is noted on the core box. The Qualified Technician will identify and tag each box with an aluminum metal tag writing the drill hole number and from-to footages, and will measure the Rock Quality Designation or RQD of the drill core and record the rock quality numbers. The Qualified Technician takes conductivity and magnetic susceptibility or MPP readings directly on the core at 50 centimeter intervals and record the measurements. X-Ray Fluorescence or XRF readings are also taken at 3 meter intervals by taking a 5-centimeter-long piece of core and placing it in the XRF analyser for a reading of the whole rock and trace elements geochemistry to help identify rock types and alteration patterns associated with metallic mineralization, The Qualified Geologist describe the drill core the GEOTIC Logging system. While describing or logging the drill core, the Qualified Geologist marks for sampling core showing sign of metallic mineralization. The Qualified Geologist marks the drill core with a colored wax pencil (usually in red) the actual intervals to be sampled and these are identified with a perpendicular line at the start and at the end of the intervals. The Qualified Geologist fill outs (with drill hole number and the from-to intervals for each sampled interval) an ALS Laboratory Group numbered dual sample tags and insert at the end of each interval to be sampled. Samples are taken at 1.5 meter intervals, however sample intervals are adjusted to respect lithological and/or mineralogical contacts and isolate narrow (<1.5m) veins or other structures that may yield higher grades. Once all sample intervals have been chosen, photos of the wet and dry core are taken, usually 4 boxes at a time bounded by a white rectangular legend inscribed with the drill hole number, box numbers, and from's and to's. The Qualified Technician saws the core of the sample intervals in half, cut normal to the predominant foliation and being properly oriented with a cut-line marked by the Qualified Geologist to cut along. One half of the core is kept as a witness sample, the other half is to be analyzed. The half of the dual sample tag for each interval is stapled to the bottom of the core box at the end of each sampled intervals. One half of the sampled intervals is bagged and tagged with one of the dual sample tags from the ALS Laboratory Group. Individual sample bags are sealed and placed into shipping pails and/or nylon shipping bags, sealed and marked with the contents. The samples are delivered by Aurvista personnel in batches sent to the ALS Laboratory Group facility in Val-d'Or, Quebec, for processing, crushing, pulverizing and analysis. For Quality Control, the Qualified Geologist and Qualified Technician prepare sample duplicates from a quarter split of the half-sampled core inserted approximately at every 20 samples. The method is to split 1/4 core of the original sample leaving 1/2 core remaining as witness in the core box. The results are reconciled with other 1/2 core samples by averaging the two 1/4 field duplicate split results - the average of the two 1/4 splits should be the same as a sample of the same 1/2 core. A blank sample is inserted every 20 samples - an ideal blank sample usually consists of a granite or gabbro that is known not to contain any metals. Purchased cobbles, barren of mineralization, are also used as blank material. A low-grade rock standard is inserted at every 100 samples. A high-grade rock standard is inserted at every 100. At the end of the analytical process, 5% to 10% of the sample pulps are re-analyzed by a different laboratory for comparative purposes. Multi-element major and trace element geochemistry is done at every 10 samples for rock type identification and alteration vectoring. Specific gravity is calculated in grams per cm3 is also calculated at every 5 or 10 sample intervals.


News Article | October 28, 2016
Site: www.marketwired.com

VANCOUVER, BRITISH COLUMBIA--(Marketwired - Oct. 27, 2016) - Riverside Resources Inc. ("Riverside" or the "Company") (TSX VENTURE:RRI)(OTC PINK:RVSDF)(FRANKFURT:R99) is pleased to provide an exploration update for ongoing work at the Thor Project (the "Project") in Sonora, Mexico. The Thor Project comprises two mineral concessions that together cover 11,275 hectares, which were previously staked as part of the Company's past exploration alliance (the "Alliance") with a wholly owned subsidiary of Antofagasta plc ("Antofagasta"). The Alliance was formed for the purpose of identifying and exploring copper porphyry targets in Northern Mexico. The Thor Project is being advanced as a Designated Project ("DP"), with Antofagasta, who currently hold a 51% interest, having the opportunity to earn a 65% interest by funding $5,000,000 in exploration over four (4) years (see Riverside's press release April 13, 2015). A ground magnetic susceptibility survey covering 18 square kilometers of the Project was recently completed by Riverside personnel on behalf of the joint venture. The survey data were reviewed, processed and interpreted by Reno-based Ellis Geophysical Consulting Inc. ("EGC"). The interpretation work done by EGC has been combined with geological and geochemical data previously obtained from the Project by the Alliance, resulting in the definition of a number of promising porphyry copper drill targets. An initial diamond drilling campaign has been designed to test three separate target areas. The planned program is to consist of 1,200 meters of core drilling and is now underway. Major Drilling de Mexico S.A. de C.V. has been contracted to perform the program. Riverside's President and CEO, John-Mark Staude, stated: "We are pleased to have further partner-funded work and drilling being done at our Thor Project. There is no evidence of previous drilling on the Project and we are excited to gain a better understanding of the geology under gravel cover and test copper targets that have seen little previous exploration before the Project was acquired by Riverside." Field work completed to date at Thor has identified Laramide-age intrusive and volcanic rocks with zoned alteration and copper mineralization that is consistent with a porphyry-type mineral system. The surface expression of hydrothermal alteration is recognized along a seven kilometer northwest trend within a down-faulted structural block that preserves the favourable Laramide intrusive-volcanic stratigraphy. Alteration zonation, defined through mapping, rock chip sampling and spectral mineral analysis, will now be reassessed together with magnetics data obtained by the recently completed geophysical survey. The scientific and technical data contained in this news release pertaining to the Thor Project was reviewed and prepared under the supervision of Locke Goldsmith, P. Eng., P. Geo., an independent qualified person to Riverside Resources who is responsible for ensuring that the geologic information provided in this news release is accurate and acts as a "qualified person" under National Instrument 43-101 Standards of Disclosure for Mineral Projects. Samples were taken to Hermosillo, Mexico where ALS Laboratory Group's mineral division ALS Chemex crushed and pulverized each sample. The rejects remained with ALS Chemex while the pulps were transported to ALS Chemex's ISO 9001-2008 certified laboratory in North Vancouver, BC, Canada for analysis. A QA/QC program was implemented as part of the sampling procedures for the exploration program. Standard and blank samples were randomly inserted into the sample stream prior to being sent to the laboratory. Riverside is a well-funded prospect generation team of focused, proactive precious and base metal discoverers. The Company currently has more than $3,000,000 in the treasury and less than 37,500,000 shares outstanding. The Company's model of growth through partnerships and exploration uses the prospect generation business approach to own resources, while partners share in de-risking projects en route to discovery. Riverside has additional properties available for option with more information available on the Company's website at www.rivres.com. ON BEHALF OF RIVERSIDE RESOURCES INC. Certain statements in this press release may be considered forward-looking information. These statements can be identified by the use of forward looking terminology (e.g., "expect"," estimates", "intends", "anticipates", "believes", "plans"). Such information involves known and unknown risks -- including the availability of funds, the results of financing and exploration activities, the interpretation of exploration results and other geological data, or unanticipated costs and expenses and other risks identified by Riverside in its public securities filings that may cause actual events to differ materially from current expectations. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this press release. Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.


Solhy A.,Mohammed V University | Tahir R.,Hassan II University | Tahir R.,ALS Laboratory Group | Sebti S.,Hassan II University | And 4 more authors.
Applied Catalysis A: General | Year: 2010

Hydroxyapatite was found to be a very efficient heterogeneous catalyst for the preparation of chalcone derivatives via Claisen-Schmidt condensation using microwave irradiation. The impact of water on the catalyst reactivity was studied and was thought to act as co-catalyst due to the high activation observed in its presence. To investigate the origin of this activation, different organic solvents of similar or higher microwave absorbance as/to water were also tested, and it was confirmed that water is acting as co-catalyst when combined with hydroxyapatite, making the process highly efficient. The catalyst was easily recovered and efficiently re-used. © 2009 Elsevier B.V. All rights reserved.


Genuis S.J.,University of Alberta | Birkholz D.,University of Alberta | Ralitsch M.,Als Laboratory Group | Thibault N.,Als Laboratory Group
Public Health | Year: 2010

There has been no proven method thus far to accelerate the clearance of potentially toxic perfluorinated compounds (PFCs) in humans. PFCs are a family of commonly used synthetic compounds with many applications, including repelling oil and stains on furniture, clothing, carpets and food packaging, as well as in the manufacturing of polytetrafluoroethylene - a non-stick surfacing often used in cookware (e.g. Teflon(r)). Some PFCs remain persistent within the environment due to their inherent chemical stability, and are very slowly eliminated from the human body due, in part, to enterohepatic recirculation. Exposure to PFCs is widespread and some subpopulations, living in proximity to or working in fluorochemical manufacturing plants, are highly contaminated. PFC bioaccumulation has become an increasing public health concern as emerging evidence suggests reproductive toxicity, neurotoxicity and hepatotoxicity, and some PFCs are considered to be likely human carcinogens. A case history is presented where an individual with high concentrations of PFCs in serum provided: (1) sweat samples after use of a sauna; and (2) stool samples before and after oral administration of each of two bile acid sequestrants - cholestyramine (CSM) and saponin compounds (SPCs). Stool samples before and after use of a cation-exchange zeolite compound were also examined. PFCs found in serum were not detected in substantial quantities in sweat or in stool prior to treatment. Minimal amounts of perfluorooctanoic acid, but no other PFCs, were detected in stool after SPC use; minimal amounts of perfluorooctanesulfonate, but no other PFCs, were detected in stool after zeolite use. All PFC congeners found in serum were detected in stool after CSM use. Serum levels of all PFCs subsequently declined after regular use of CSM. Further study is required but this report suggests that CSM therapy may facilitate gastrointestinal elimination of some PFCs from the human body. © 2010 The Royal Society for Public Health.


Birkholz D.A.,ALS Laboratory Group
Proceedings of the 34th AMOP Technical Seminar on Environmental Contamination and Response | Year: 2011

Private laboratories often receive soil samples from industry and consultants for the purposes of hydrocarbon testing. Usually the information required pertains to hydrocarbon levels (CCME - F1-F4) and this information is employed to determine regulatory compliance and the need for reclamation. In some instances, where the observed data suggests that exceedences have occurred and reclamation is required, additional questions often arise. These include the nature of the petroleum, potential source(s) and age of the product. The rationale behind these questions is one of assigning liability and ultimately cost of cleanup. The ability to answer such questions requires the application of forensic techniques. We were provided with three soil samples from a consultant, and following analyses for total petroleum hydrocarbons (F1-F4) it was determined that regulatory exceedences had occurred and that extensive reclamation was required. The consultant requested our laboratory to provide information on the nature of the petroleum as well as the age of the product. A Phase I audit determined a potential source, however, no product was available that we could compare to. Furthermore, it was determined that these samples were extremely weathered. Our approach to answering the question of the nature of the petroleum product and age is presented and discussed.


Genuis S.J.,University of Alberta | Beesoon S.,University of Alberta | Birkholz D.,ALS Laboratory Group | Lobo R.A.,University of Alberta
Journal of Environmental and Public Health | Year: 2012

Background. Bisphenol A (BPA) is an ubiquitous chemical contaminant that has recently been associated with adverse effects on human health. There is incomplete understanding of BPA toxicokinetics, and there are no established interventions to eliminate this compound from the human body. Using 20 study participants, this study was designed to assess the relative concentration of BPA in three body fluids-blood, urine, and sweat-and to determine whether induced sweating may be a therapeutic intervention with potential to facilitate elimination of this compound. Methods. Blood, urine, and sweat were collected from 20 individuals (10 healthy participants and 10 participants with assorted health problems) and analyzed for various environmental toxicants including BPA. Results. BPA was found to differing degrees in each of blood, urine, and sweat. In 16 of 20 participants, BPA was identified in sweat, even in some individuals with no BPA detected in their serum or urine samples. Conclusions. Biomonitoring of BPA through blood and/or urine testing may underestimate the total body burden of this potential toxicant. Sweat analysis should be considered as an additional method for monitoring bioaccumulation of BPA in humans. Induced sweating appears to be a potential method for elimination of BPA. © 2012 Stephen J. Genuis et al.


Genuis S.J.,University of Alberta | Beesoon S.,University of Alberta | Lobo R.A.,University of Alberta | Birkholz D.,Als Laboratory Group
The Scientific World Journal | Year: 2012

Background. Individual members of the phthalate family of chemical compounds are components of innumerable everyday consumer products, resulting in a high exposure scenario for some individuals and population groups. Multiple epidemiological studies have demonstrated statistically significant exposure-disease relationships involving phthalates and toxicological studies have shown estrogenic effects in vitro. Data is lacking in the medical literature, however, on effective means to facilitate phthalate excretion. Methods. Blood, urine, and sweat were collected from 20 individuals (10 healthy participants and 10 participants with assorted health problems) and analyzed for parent phthalate compounds as well as phthalate metabolites using high performance liquid chromatography-tandem mass spectrometry. Results. Some parent phthalates as well as their metabolites were excreted into sweat. All patients had MEHP (mono(2-ethylhexyl) phthalate) in their blood, sweat, and urine samples, suggesting widespread phthalate exposure. In several individuals, DEHP (di (2-ethylhexl) phthalate) was found in sweat but not in serum, suggesting the possibility of phthalate retention and bioaccumulation. On average, MEHP concentration in sweat was more than twice as high as urine levels. Conclusions. Induced perspiration may be useful to facilitate elimination of some potentially toxic phthalate compounds including DEHP and MEHP. Sweat analysis may be helpful in establishing the existence of accrued DEHP in the human body. © 2012 Stephen J. Genuis et al.

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