Le Mignot E.,CNRS Georesources lab |
Le Mignot E.,University of Lorraine |
Reisberg L.,University of Lorraine |
Andre-Mayer A.-S.,CNRS Georesources lab |
And 4 more authors.
Economic Geology | Year: 2017
The Archean-Proterozoic craton of West Africa hosts numerous gold deposits, which are spatially and temporally related to the Eburnean orogeny that took place between 2250 and 1980 Ma, and included multiple deformation events. The majority of these gold deposits are located along shear zones. The structural history is relatively well established for most gold deposits, but absolute timing of the mineralization is commonly lacking. Five deposits hosted in the Baoulé-Mossi domain, located in the southwestern part of the West African craton, were studied to better constrain timing of gold events: Nassara and Kiaka in Burkina Faso and Wassa, Damang, and Obuasi in southern Ghana. Gold mineralization was structurally characterized at each deposit, and dated by the Re-Os method on pyrite, arsenopyrite, and pyrrhotite grains that were coeval with the gold deposition. Combined structural and Re-Os geochronological constraints allow two groups of gold deposits to be distinguished. Early orogenic gold formed during the Eoeburnean orogeny, i.e., between 2190 and 2125 Ma, as represented by Kiaka1 at 2157 ± 24 Ma, and Wassal at 2164 ± 14 Ma. These early gold occurrences are expressed as early disseminated gold enrichment (1-3 g/t Au) at Kiaka, and gold hosted in folded and boudinaged quartz veins that are transposed along the primary S1 foliation at Wassa. These Re-Os ages on the early sulfides at Wassa and Kiaka are significant because they definitively provide the first direct age constraints on gold-only Eoeburnean mineralization in the Birimian of West Africa. Late orogenic gold, hosted by brittle structures and with higher gold grades (up to 60g/t at Kiaka), formed during late Eburnean deformation (D3-D5 events) between 2120 and 2000 Ma, as represented by the Re-Os dating of these ores at Wassa at 2055 ± 18 Ma and Obuasi at 2045 ± 40 Ma. Similar-style ores dated at Nassara at 2131 ± 99 Ma and Damang at 2080 ± 135 Ma, but both with large uncertainties, and an undated younger event at Kiaka, are also suggested to be part of this later mineralizing episode. The high uncertainties on the Nassara and Damang ages may be directly linked to the low rhenium and osmium contents of the studied samples. These results highlight the polyphase character of the widespread gold mineralization in the West African craton. Although the late stages of the Eburnean orogeny constitute a prolific period for the formation of highgrade gold mineralization, identification of less well-studied early-stage gold deposits, which can also contain large quantities of gold, is critical for mineral exploration in the West African craton. © 2017 Society of Economic Geologists, Inc.
News Article | December 21, 2016
DENVER--(BUSINESS WIRE)--Solitario Exploration & Royalty Corp. (“Solitario;” NYSE MKT: XPL; TSX: SLR) is pleased to announce today that its board of directors has appointed John Labate, age 67, to the board of directors. Mr. Labate was also appointed to serve as the Audit Committee chairman. Mr. Labate has over 30 years’ experience in the mining industry and has held senior financial management positions in mining and technology companies. Mr. Labate is currently the Chief Financial Officer of Gold Resource Corporation (NYSE-MKT: GORO) and has served in that capacity since May 2015. Prior to that, Mr. Labate served as a consultant in accounting and finance matters in the mining industry as well as Chief Financial Officer for Golden Star Resources Ltd., a gold mining company (NYSE MKT: GSS; TSX: GSC) and Constellation Copper Corporation, Crown Resources Corporation and Applied Optical Technologies. Mr. Labate received a bachelor’s degree in Accounting from San Diego State University. Chris Herald, President and CEO of Solitario, stated: “We are very pleased that John has accepted a position on our board and will lead the Audit Committee. His management experience in accounting and regulatory issues in the mining industry both in the US and Canada will be a valuable addition to our board.” Solitario also announced that John Hainey will resign as a director and Chairman of its Audit Committee effective December 31, 2016. Chris Herald stated: "On behalf of the Board and Solitario employees, we want to thank John for his more than 20 years with Solitario, including his invaluable service in leading the Solitario Audit Committee. We are thankful to John for his contributions to Solitario's success and wish him all the best going forward." Solitario announced today that its board of directors has approved the extension of its existing share repurchase program through December 31, 2017. The share repurchase program, as initially approved in October 2015, authorized Solitario to repurchase up to 2.0 million shares of its outstanding common stock and was set to expire on December 31, 2016. As of December 20, 2016, Solitario has repurchased 613,000 shares under the plan at an average price of US$0.507 per share, Under the program, as now extended, Solitario will have the ability to repurchase up to the remaining 1,387,000 available shares under the plan through December 31, 2017. All shares repurchased will be cancelled and will reduce Solitario’s current 38.7 million shares outstanding. The timing and amount of any stock repurchased will be determined by Solitario’s Company’s management in the open market or in privately negotiated transactions based on market conditions and other factors, including price, regulatory requirements and capital availability, and in compliance with applicable state and federal securities laws. Repurchases may also be made under Rule 10(b)-18. The program does not require the repurchase of any minimum number of shares and may be suspended, modified or discontinued at any time without prior notice. No repurchases will be made outside of the United States, including shares trading on the Toronto Stock Exchange. Payment for shares repurchased under the program will be funded using Solitario’s working capital. Chris Herald stated: “The share repurchase program demonstrates our commitment to creating, enhancing and returning value to shareholders. We believe our current stock value does not reflect the value of our current cash position, our carried interest in the high-grade Bongará zinc project, and our past success in identifying, acquiring and enhancing precious and base metal properties with solid technical work.” Solitario is an exploration and royalty company. Solitario has a joint venture with Minera Milpo (a Peruvian zinc miner) on its high-grade Bongará zinc project in Peru. Solitario is traded on the NYSE MKT ("XPL") and on the Toronto Stock Exchange ("SLR"). Additional information about Solitario is available online at www.solitarioxr.com. This press release contains forward-looking statements within the meaning of the U.S. Securities Act of 1933 and the U.S. Securities Exchange Act of 1934, and as defined in the United States Private Securities Litigation Reform Act of 1995 (and the equivalent under Canadian securities laws), that are intended to be covered by the safe harbor created by such sections. Forward-looking statements are statements that are not historical fact. They are based on the beliefs, estimates and opinions of Solitario’s management on the date the statements are made and address activities, events or developments that Solitario expects or anticipates will or may occur in the future, and are based on current expectations and assumptions. Forward-looking statements involve a number of risks and uncertainties. Consequently, there can be no assurances that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Such forward-looking statements include, without limitation, statements regarding Solitario’s intentions to repurchase shares of its common stock from time to time under the stock repurchase program, that any or all repurchases will be in conformance with Rule 10(b)-18, the timing and amounts of any repurchases, the intended use of any repurchased shares, the source of funding for the stock repurchase program. It can give no assurance that these expectations will prove correct. Additional risk factors are discussed in Solitario’s filings with the U.S. Securities and Exchange Commission (the “SEC”) including Solitario’s latest Annual Report on Form 10-K and its other SEC filings (and Canadian filings) including, without limitation, its latest Quarterly Report on Form 10-Q. Solitario does not intend to publicly update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as may be required under applicable securities laws.
News Article | February 21, 2017
TORONTO, Feb. 21, 2017 /PRNewswire/ - Golden Star Resources Ltd. (NYSE MKT: GSS; TSX: GSC; GSE: GSR) ("Golden Star" or the "Company") reports its financial and operational results for the fourth quarter and full year ended December 31, 2016. HIGHLIGHTS: 2016 full year...
News Article | December 5, 2016
Results Include 31.7 Metres Grading 23.8 Grams Per Tonne of Gold TORONTO, Dec. 5, 2016 /PRNewswire/ - Golden Star Resources Ltd. (NYSE MKT: GSS; TSX: GSC; GSE: GSR) ("Golden Star" or the "Company") is pleased to report significant results from the drilling program at its Wassa...
News Article | December 12, 2016
NEW YORK, December 12, 2016 /PRNewswire/ -- Pre-market, Stock-Callers.com shifts focus on Sandstorm Gold Ltd (NYSE MKT: SAND), Alamos Gold Inc. (NYSE: AGI), Golden Star Resources Ltd (NYSE MKT: GSS), and Gold Resource Corp. (NYSE MKT: GORO). On Friday, December 09th, 2016, Gold...
News Article | October 31, 2016
NEW YORK, October 31, 2016 /PRNewswire/ -- Stock-Callers.com takes notice of the following Gold equities ahead of today's trading session: Golden Star Resources Ltd (NYSE MKT: GSS), Sandstorm Gold Ltd (NYSE MKT: SAND), NovaGold Resources Inc. (NYSE MKT: NG), and Alamos Gold Inc....
News Article | February 27, 2017
TORONTO, Feb. 27, 2017 /PRNewswire/ - Golden Star Resources Ltd. (NYSE MKT: GSS; TSX: GSC; GSE: GSR) ("Golden Star" or the "Company") announces its Mineral Reserves and Mineral Resources estimate as of December 31, 2016. HIGHLIGHTS Proven and Probable Mineral Reserves of 1.9...
News Article | November 2, 2016
TORONTO, Nov. 2, 2016 /PRNewswire/ - Golden Star Resources Ltd. (NYSE MKT: GSS; TSX: GSC; GSE: GSR) ("Golden Star" or the "Company") reports its financial and operational results for the third quarter ended September 30, 2016. Highlights: At the end of the third quarter of...
News Article | November 18, 2016
TORONTO, Nov. 18, 2016 /PRNewswire/ - Golden Star Resources Ltd. (NYSE MKT: GSS; TSX: GSC; GSE: GSR) ("Golden Star" or the "Company") is hosting an analyst and investor visit to its two gold mines in Ghana, the Wassa Gold Mine and the Prestea Gold Mine. During the next three days, the...