Engineering & Mining Journal

NOV 2017

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

Issue link:

Contents of this Issue


Page 25 of 83

REGIONAL NEWS - ASIA 24 E&MJ • NOVEMBER 2017 Eldorado Lowers Guidance on Ki ladağ Citing lower recoveries, Eldorado Gold has revised its 2017 guidance for the Ki ladağ gold mine in Turkey to 170,000 ounces (oz) to 180,000 oz at cash costs of $500/ oz to $550/oz. At the beginning of the year, the company was expecting Ki ladağ to produce 230,000 oz to 240,000 oz. Guidance for 2018 and beyond, according to the company, is currently under review. Ki ladağ is a low-grade, bulk-tonnage, open-pit operation that uses heap leach for gold recovery. While placing ore on the leach pad as planned during June, the company reported the gold solution grade and consequently gold recovery from the leach pad had lagged internal expectations. Initial laboratory and in situ tests, where solution chemistry was adjusted, indicated normal recovery rates were still expected. Eldorado also believed that more time for a solution to flow through the current stack height of the leach pad (approximately 80 meters at the highest point) was required. During the third quarter, a significant amount of laboratory test work was under- taken, primarily focused on the zone of mineralization located around the base of the open pit where mining is currently un- der way. Monthly composite samples from material recently placed on the pad, even with adjusted solution chemistry, have indicated lower gold recoveries. Final re- coveries in the low 40% range are now anticipated for this material and that will reduce the recoverable leach pad invento- ry by approximately 40,000 oz of gold. Further metallurgical test work on heap leaching is ongoing to determine the ex- tent of the impact on gold resources and reserves. The company is also investigat- ing alternative treatment methods for this material, which includes studies on finer particle breakage, either through milling or high-pressure grinding roll (HPGR) crush- ers. The company has previously contem- plated construction of a mill at Ki ladağ and historic and ongoing test work using bottle rolls and other metallurgical tests indicate that milling should result in con- sistently higher recoveries compared to heap leaching throughout the orebody. Ore is stacked on the leach pad at the Ki ladağ mine in Turkey. "Canadian Zinc has to date invested al- most $85 million in the exploration, devel- opment, environmental assessment, and permitting of the Prairie Creek mine and has significantly improved and de-risked the project," said Canadian Zinc Chairman and CEO John F. Kearney. "With the recent recommendation from the Mackenzie Val- ley Environmental Impact Review Board for approval of the all-season road, and with this robust feasibility study in hand, Canadian Zinc will now concentrate efforts on financing for the development and con- struction of the Prairie Creek mine." "We are currently engaged in ad- vanced discussions with several finance providers, and ongoing engineering and early project work activities are already under way to facilitate a rapid start to construction. The development and con- struction period is estimated at 2.5 years, and, subject to completion of financing, the startup of mine production is project- ed for mid-2020." The Prairie Creek project is located in the South Mackenzie Mountains in the far southwest of the Northwest Territories, ap- proximately 500 kilometers (km) west of Yellowknife. The Prairie Creek feasibility study was completed by AMC Mining Con- sultants (Canada) and Ausenco Engineer- ing Canada, with input from Allnorth Con- sultants, F. Wright Consulting, G. Mosher of Global Mineral Resource Services Ltd., and HCF International Advisers Ltd. A revised PFS says the Prairie Creek mine could produce 95 million lb/y of zinc. (News-Leading Developments - from p. 6) NEWS - CONTINUED

Articles in this issue

Links on this page

Archives of this issue

view archives of Engineering & Mining Journal - NOV 2017