Olauson E.,Norwest Corporation |
Dawson R.,Norwest Corporation |
Wells P.S.,Suncor Energy
Tailings and Mine Waste'10 - Proceedings of the 14th International Conference on Tailings and Mine Waste | Year: 2011
As one of the final phases of surface closure operations on Pond 1, due to be completed in 2010, Suncor has been undertaking the capping of an 11 ha area of soft tailings. After several years of investigation using cone penetration test methods and sampling to determine the general geotechnical properties of the tailings (strengths in the range of 1 to 8 kPa were measured), a mechanically placed, geogrid-reinforced sand cap was designed for the area. The objective of the capwas to create a trafficable surface on the pond and to apply a surcharge to promote consolidation of the underlying material. The design basis included carrying out the construction work in the winter months, when the benefits of frozen tailings could be realized. Construction progressed from January to April 2010 and involved using small equipment (D3 and D6 dozers) to place the two 1 m sand lifts. The cap provides a trafficable surface for carrying out reclamation activities and monitoring tailings consolidation and strengthening. © 2011 Taylor & Francis Group, London.
News Article | February 15, 2017
VANCOUVER, BRITISH COLUMBIA--(Marketwired - Feb. 15, 2017) - Northern Empire Resources Corp. (TSX VENTURE:NM) (the "Company" or "Northern Empire") today announced that the Company has entered into a Letter of Intent ("LOI") with Sterling Gold Mining Corporation ("SGMC"), a wholly owned subsidiary of Imperial Metals Corporation ("Imperial Metals")(TSX:III) to acquire a 100% interest in the Sterling property, located in Nye County, Nevada, and certain royalty rights for claims located in Nevada and California (the "Proposed Transaction"). Michael G. Allen, President, CEO and Director of Northern Empire commented, "Acquiring the Sterling property represents a company changing opportunity for the shareholders of Northern Empire. The next phase of open pit mining has been permitted at Sterling, and the properties have not seen significant exploration in 20 years. The Sterling land package consists of two claim blocks, Sterling and Daisy. Combined, the land package represents the acquisition of a gold district within Nevada, hosting 3 past producing open pit mines. The Sterling mine has previously operated as a high grade open pit and underground operation as recently as 2015, and is known for it's excellent run of mine heap leach recoveries. The site is staffed, with leach rinsing operations continuing. The Daisy claim block has indications of a large Carlin system, which has seen very little exploration since the late 1990s." Under the terms of the Proposed Transaction with SGMC, the Company will acquire: The purchase price for the assets will consist of: The completion of the transaction is subject to a number of conditions to closing including, but not limited to Northern Empire's satisfactory completion of legal, title and environmental due diligence with respect to the Sterling Property, completion of various financings to raise adequate funds to make the purchase, board and regulatory approvals, and other customary conditions in the mining industry for similar asset purchase and sales. In relation to the Proposed Transaction, the Company will be arranging a bridge financing of convertible debentures. The proceeds of the bridge financing will be used to pay the US$250,000 deposit due to SGMC, complete an updated NI 43-101 technical report on the Sterling property and for due diligence and working capital purposes. The interest free convertible debenture will convert into a unit of the Company consisting of a share and a half warrant (each full warrant, a "Warrant") upon the closing of the Proposed Transaction, or, if the Proposed Transaction doesn't complete, upon resumption of trading of the Company's shares. The conversion price shall be equal to (a) the price for which the Company completes the Subsequent Financing, as set out below, or (b) if the Proposed Transaction doesn't complete, $0.175. Each Warrant shall be exercisable into a common share of Northern Empire at a price of 33 1/3% premium to the conversion price for a period of 2 years following the closing of the convertible debenture financing. In the event that the Company files a prospectus in connection with the Acquisition Financing, it will use reasonable commercial efforts to qualify the issuance of the Units under the prospectus. In addition, the Company intends to complete a subsequent financing (the "Acquisition Financing") to complete the Proposed Transaction, the proceeds of which will be used to fund the purchase price for the proposed Acquisition, for ongoing exploration work on the Sterling Property and for general working capital. Further details regarding the Acquisition Financing will be released in due course. The Company has engaged Cormark Securities Inc. as its financial advisor in connection with the proposed transaction and Acquisition Financing. McCullough O'Connor Irwin LLP and Parsons Behle and Latimer are acting as legal advisors on the transaction. The Company has engaged JDS Energy and Mining and Norwest Corporation as technical advisors. Northern Empire is an aggressive, Vancouver based, gold explorer working to take advantage of the current improving market conditions by assembling a value driven portfolio of properties. Michael G. Allen, President of Northern Empire, and a Qualified Person as defined by NI 43-101, has reviewed the information contained in this news release. He is the non-independent qualified person for this new release and has verified the data. ON BEHALF OF THE BOARD OF NORTHERN EMPIRE RESOURCES CORP. 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 NEWS RELEASE. Certain information set forth in this news release contains "forward-looking statement", and "forward-looking information" under applicable securities laws. Except for statements of historical fact, certain information contained herein constitutes forward-looking statements, which include the Company's expectations about the completion of the Proposed Transaction and the related financings, future performance based on current results and expected cash costs and are based on the Company's current internal expectations, estimates, projections, assumptions and beliefs, which may prove to be incorrect. Some of the forward-looking statements may be identified by words such as "will", "expects", "anticipates", "believes", "projects", "plans", and similar expressions. These statements are not guarantees of future performance and undue reliance should not be placed on them. Such forward-looking statements necessarily involve known and unknown risks and uncertainties, which, may cause the Company's actual performance and financial results in future periods to differ materially from any projects of future performance or results expressed or implied by such forward-looking statement. These risks and uncertainties include, but are not limited to: liabilities inherent in mine development and production; geological risks, the financial markets generally, the results of the due diligence investigations to be conducted by the Company, the ability of the Company to complete the related financings or obtain requisite Exchange acceptance. There can be no assurance that forward-looking statement will prove to be accurate, and actual results and future events could differ materially from those anticipate in such statements. The Company undertakes no obligation to update forward-looking statements if circumstances or management's estimates or opinions should change except as required by applicable securities laws. The reader is cautioned not to place undue reliance on forward-looking statements.
Ronayne M.J.,Colorado State University |
Houghton T.B.,Colorado State University |
Houghton T.B.,Norwest Corporation |
Stednick J.D.,Colorado State University
Journal of Hydrology | Year: 2012
Three different measurement techniques (a mini-disk infiltrometer, a double-ring infiltrometer, and a Guelph permeameter) were used to characterize the saturated hydraulic conductivity of an alpine glacial till in the Rocky Mountains of southern Wyoming, USA. Measurements from 32 locations reveal significant spatial heterogeneity. The hydraulic conductivity varies over two orders of magnitude from approximately 0.05-5. m/d. Along with natural variability throughout the study area, the results also indicate that the estimated hydraulic conductivity is dependent on measurement technique. Compared to the mini-disk infiltrometer, hydraulic conductivities are consistently higher for the double-ring infiltrometer and Guelph permeameter. By considering surface-subsurface hydrologic response during snowmelt, we demonstrate the importance of accurately characterizing the hydraulic conductivity. A model parameterized with a low hydraulic conductivity underestimates the rate of shallow groundwater flow, suggesting that the subsurface saturated zone may not be able to accommodate all of the snowmelt-derived recharge. Saturation-excess overland flow is predicted as a result. These findings have important implications for integrated hydrologic assessments focused on understanding water flows in glaciated alpine watersheds. © 2012 Elsevier B.V.
PubMed | University of Nevada, Reno, Norwest Corporation and Nuclear Waste Repository Program Office
Type: Journal Article | Journal: Ground water | Year: 2016
To better understand the groundwater resources of southern Nye County, Nevada, a multipart distributed thermal perturbation sensing (DTPS) test was performed on a complex of three wells. These wells penetrate an alluvial aquifer that drains the Nevada National Security Site, and characterizing the hydraulic properties and flow paths of the regional groundwater flow system has proven very difficult. The well complex comprised one pumping well and two observation wells, both located 18 m from the pumping well. Using fiber-optic cables and line heaters, DTPS tests were performed under both stressed and unstressed conditions. Each test injects heat into the water column over a period of one to two days, and observes the rising temperature during heat injection and falling temperatures after heating ceases. Aquifer thermal properties are inferred from temperature patterns in the cased section of the wells, and fluxes through the 30-m screened section are estimated based on a model that incorporates conductive and advective heat fluxes. Vertical variations in flux are examined on a scale of tens of cm. The actively flowing zones of the aquifer change between the stressed and unstressed test, and anisotropy in the aquifer permeability is apparent from the changing fluxes between tests. The fluxes inferred from the DTPS tests are compared to solute tracer tests previously performed on the same site. The DTPS-based fluxes are consistent with the fastest solute transport observed in the tracer test, but appear to overestimate the mean flux through the system.
Siegrist R.L.,Colorado School of Mines |
Parzen R.,Norwest Corporation |
Tomaras J.,Massachusetts Institute of Technology |
Lowe K.S.,Colorado School of Mines
Water Research | Year: 2014
Drip dispersal of partially treated wastewater was investigated as an approach for onsite water reclamation and beneficial reuse of water and nutrients in a semi-arid climate. At the Mines Park Test Site in Golden, Colorado, a drip dispersal system (DDS) was installed at 20- to 30-cm depth in an Ascalon sandy loam soil profile. Two zones with the same layout were established to enable study of two different hydraulic loading rates. Zones 1 and 2 each had one half of the landscape surface with native vegetation and the other with Kentucky bluegrass sod. After startup activities, domestic septic tank effluent was dispersed five times a day at footprint loading rates of 5L/m2/d for Zone 1 and 10L/m2/d for Zone 2. Over a two-year period, monitoring included the frequency and volume of effluent dispersed and its absorption by the landscape. After the first year of operation in October a 15N tracer test was completed in the sodded portion of Zone 1 and samples of vegetation and soil materials were collected and analyzed for water content, pH, nitrogen, 15N, and bacteria. Research revealed that both zones were capable of absorbing the effluent water applied at 5 or 10L/m2/d. Effluent water dispersed from an emitter infiltrates at the emitter and along the drip tubing and water movement is influenced by hydrologic conditions. Based on precipitation and evapotranspiration at the Test Site, only a portion of the effluent water dispersed migrated downward in the soil (approx. 34% or 64% for Zone 1 or 2, respectively). Sampling within Zone 1 revealed water filled porosities were high throughout the soil profile (>85%) and water content was most elevated along the drip tubing (17-22% dry wt.), which is also where soil pH was most depressed (pH 4.5) due to nitrification reactions. NH4+ and NO3- retention occurred near the dispersal location for several days and approximately 51% of the N applied was estimated to be removed by plant uptake and denitrification. Heterotrophic bacteria levels were elevated (up to 1log) in the subsurface within the DDS but there was effective elimination of effluent fecal coliform and Escherichia coli bacteria. © 2013 Elsevier Ltd.
Bhattacharyya S.,Norwest Corporation |
Nelson M.G.,University of Utah
2015 SME Annual Conference and Expo and CMA 117th National Western Mining Conference - Mining: Navigating the Global Waters | Year: 2015
Coal bearing rocks are low in strength and have geological discontinuities and moisture sensitivity. Roof and rib falls have been a major cause of fatalities in underground coal mines. Mine engineers design ground control plans for regulatory approvals. A number of tools are available from the National Institute for Occupational Safety and Health to design and assess these plans. Quite often there is not enough geotechnical input information available and databases are used. The Appalachian coalfields have extensive scientific studies to provide reliable regional inputs. Coal mines in the western United States and Canada have different geological and geotechnical conditions, and less available data. Use of inappropriate inputs in the tools like Analysis of Retreat Mining Pillar Stability, Analysis of Longwall Pillar Stability, and Analysis of Roof Bolt Systems may result in unsafe designs or over conservative designs. The tools are convenient but thorough understanding of the inputs, calibration with local test results, and operating experience are important for effective designs. The current paper contains examples of difficulties faced during mine planning using the above tools. Copyright © 2015 by SME.
An evaluation of air permeability measurements to characterize the saturated hydraulic conductivity of soil reclamation covers [Caractérisation de la conductivité hydraulique des sols bonifiés au point de saturation d’après la perméabilité à l’air]
Huang M.,University of Saskatchewan |
Huang M.,Northwest Agriculture and Forestry University |
Rodger H.,Norwest Corporation |
Barbour S.L.,University of Saskatchewan
Canadian Journal of Soil Science | Year: 2015
The saturated hydraulic conductivity (Ks) of soil covers used in land reclamation is known to change over time as the result of weathering processes. Guelph permeameter (GP) measurements have been used to track the evolution of Ksfor soil covers at an oil sands mine near Ft. McMurray , Alberta. Although successful, the method was time consuming and consequently a rapid method of estimating Ksbased on in situ air permeability measurements was developed. The objectives of this study were: (1) to use air permeability measurements to characterize the spatial variations of Ksfor typical reclamation soils and (2) to compare air permeability measurements to direct measurements obtained through laboratory and GP measurements. The results highlight that the values of Ksestimated from measured air permeability values were higher than the values of Ksmeasured directly using the GP. This is likely due to swelling of clay soils or air-entrapment during GP measurements. Although the magnitude was over-estimated, the variability of Kswas captured by the air permeability measurements. Consequently, a limited program of comparative GP and air permeameter measurements could be used to more rapidly characterize the Ksof reclamation covers over time. ©, 2015 Agricultural Institute of Canada, All rights reserved.
Toney T.A.,Norwest Corporation |
Hickinbotham A.,Coal Performance Investigations Ltd. |
Trygstad J.E.,Norwest Corporation
International Coal Preparation Congress 2010, Conference Proceedings | Year: 2010
New Canadian mercury stack emission regulations will come into effect January 1, 2011. In response, TransAlta Utilities Corporation has been testing the efficacy of the activated carbon in removing mercury from the flue gas at its Sundance Power Plants at Wabamun Lake, Alberta, Canada. At the same time, TransAlta has been investigating the economic feasibility of washing coal to reduce the amount of mercury and ash entering the boiler and thereby reducing the amount and expense of activated carbon needed to capture the mercury. Norwest Corporation consultants chose a low capital partial wash design that incorporated an innovative roller screen to remove fine coal, less than 10 mm, from the washing process. A comprehensive sampling and washability analyses program was undertaken to determine the distribution of mercury in the different coal seams, partings and floor rock. This data was then fed to plant simulation software to determine to what extent mercury and ash would be removed with washing the coarse sized mine product. Preliminary indications show: 1. A 5% reduction in tons burned due to increased Btu; 2. A 23% reduction in total tons of ash produced; and 3. A 31% reduction in the amount of mercury going to combustion.
Sequera B.,University of Calgary |
Sequera B.,Norwest Corporation |
Moore R.G.,University of Calgary |
Mehta S.A.,University of Calgary |
Ursenbach M.G.,University of Calgary
Journal of Canadian Petroleum Technology | Year: 2010
During in-situ combustion (ISC) processes, different chemical reactions occur depending on the temperature level. In heavy oils and bitumens, low temperature oxidation (LTO) reactions dominate below 300°C, increasing the density and viscosity and producing coke which could prevent the success of ISC. Above 350°C, combustion reactions dominate, known as high temperature oxidation (HTO), producing carbon oxides and water. Numerical models tend to include only thermal cracking and HTO reactions, as LTO reactions are not well understood. In the present work, ISC experiments operated under LTO were simulated, using Saturates, Aromatics, Resins and Asphaltenes (SARA) fractions to characterize the Athabasca bitumen. Concentration profiles and coke deposition for individual temperatures were matched for isothermal experiments from 60°C to 150°C. Based on these results, ramped temperature oxidation (RTO) experiments were then modelled, incorporating the heat of reaction at LTO. Different reaction models were studied to match temperature profiles along the reactor, oxygen consumption, coke formation and fluids production. This research will greatly increase the understanding of LTO reactions occurring in Athabasca bitumen during ISC and contribute to the creation of a reliable numerical model that predicts ISC performance under ideal (HTO) and, importantly, non-ideal (LTO) temperature conditions.
Eglington B.M.,University of Saskatchewan |
Pehrsson S.J.,Geological Survey of Canada |
Ansdell K.M.,University of Saskatchewan |
Lescuyer J.-L.,AREVA |
And 3 more authors.
Precambrian Research | Year: 2013
Studies of the evolution of the Earth require a better understanding of regional geological geology, particularly for earth scientists who do not have broad, domain-specific knowledge. The Palaeoproterozoic geology of North America and Greenland has been summarized at domain level using the database system developed for the IGCP 509 project "Palaeoproterozoic Supercontinents and Global Evolution", with additional geochronological information from the DateView database. A series of diagrams illustrate and contrast the geochronology and isotopic evolution of the Trans-Hudson Orogen and its bounding older crustal domains. These are accompanied by several time-space correlation charts and time-slice tectonic reconstructions showing the lithostratigraphy of the region. The origin and setting of uranium mineralization in Canada is discussed in order to illustrate the knowledge potential captured within these databases. © 2013 Elsevier B.V.