Engineering & Mining Journal

JUL 2018

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 23 of 75

REGIONAL NEWS - EXPLORATION ROUNDUP 22 E&MJ • JULY 2018 Wallbridge Starts Ramp Development, Underground Drilling at Fenelon Wallbridge Mining has completed rehabil- itation of existing underground workings and commenced ramp development and underground diamond drilling as part of a 35,000-metric-ton (mt) bulk sample and underground exploration program at its 100% owned Fenelon gold property in northwest Quebec. "Once dewatered, the underground workings on the existing 5228 and 5213 levels were found to be in excellent shape, allowing for rehabilitation to be complet- ed as planned," Wallbridge President and CEO Marz Kord said. "With ramp devel- opment now under way, we are on track to reach the next, 5195, level and start ore production from the first long-hole stopes in third quarter of 2018." An 8,000-meter (m) underground drill- ing program is also under way as part of a stope definition and resource expansion program proximal to the mine workings down to 150 m depth. The drilling is designed to fill in and extend high-grade mineralization intersected last year, when highlight intersections included 260.4 grams/mt gold over 7.02 m, 141.2 g/mt over 7.06 m, and 311.1 g/mt over 3.06 m. Deeper drilling to test the down-plunge of known high-grade shoots is planned for the fourth quarter of 2018 once the lower levels are developed. A 10,000-m surface drilling program is also scheduled to start in the latter part of 2018 to follow known mineralized zones and expand resources at depth and further away from the mine workings. "We are very excited to start the in- fill and resource expansion drill program, which will allow us to fully define and expand the high-grade mineralization we discovered last year," Wallbridge Vice President of Exploration Attila Pentek said. "Given the sub-parallel nature of gold-bearing structures at Fenelon, each drill hole is testing multiple zones, there- by not only defining the stopes to be tak- en during the bulk sample, but also pre- paring stopes for future production and exploring for additional mineralization. "The 18,000-m drill program planned for 2018 will also test other zones outside of the current resource to be used toward an updated resource estimate in early 2019." ( Exploration Briefs Endeavour Mining's ongoing exploration program in the Kari area 7 kilometers (km) west of its Houndé mine and processing plant in Burkina Faso has successfully extended the Kari Pump high-grade min- eralization discovered in 2017 and dis- covered two additional large mineralized zones named Kari Centre and Kari West. Following the Kari Pump discovery, explo- ration efforts were prioritized on the wider Kari area, which hosts a large gold-in-soil geochemical anomaly measuring 6 km long by 2.5 km wide area. The 2018 campaign has been very successful, with more than 65% of the 120 reverse circulation holes encounter- ing at least one interval of mineralization of 0.5 g/mt gold, with a minimum width of more than 2 m. To date, the Kari targets have been investigated by mainly shallow air-core drilling, with the majority of the reported mineralization located within the saprolite zone at a vertical depth not ex- ceeding 60 m to 80 m. More than 1,000 holes totaling 76,000 m have been drilled in the Kari area since late December 2017, extending the min- eralized zone to an area now measuring 4 km long by 3 km wide, with approximately 25% of the gold-in-soil anomaly remaining to be drilled. A minimum of an addition- al 65,000 m of drilling is expected to be completed before year-end 2018. In addition to the air-core and re- verse-circulation drilling program, a ded- icated diamond drilling campaign is also ongoing at the Kari targets to increase confidence in the geological interpretation and provide technical support for resourc- es classification requirements. An in-fill drilling program is planned on the Kari Pump target to obtain a maiden indicated resource estimate by year-end 2018. ( Silver Bull Resources has signed an agreement with South32 Ltd. whereby South32 can earn a 70% interest in Sil- ver Bull's Sierra Mojada project in Coa- huila, Mexico. To maintain its option in good standing, South32 must contribute minimum exploration funding of $10 mil- lion during a four-year option period. The first year's exploration program in- cludes a regional airborne electromagnetic survey, followed by a targeted drilling pro- gram. Initial targets will include extensions of the sulphide zones recently identified by Silver Bull. Silver Bull is initially acting as manager of the exploration program. The Sierra Mojada project has a mea- sured and indicated resource of 58.7 million mt grading 3.6% zinc and 50 g/ mt silver at a $13.50 NSR cutoff, con- taining 4.67 billion lb of zinc and 90.8 million oz of silver. Included within the global resource is a measured and in- dicated high-grade zinc zone of 10.03 million mt at an average grade of 11% zinc at a 6% cutoff and a measured and indicated high-grade silver zone of 19 million mt at an average grade of 102.5 g/mt silver. Mineralization remains open to the east, west and north. ( Trilogy Metals has reported an initial in- ferred cobalt resource of 77 million lb at its Bornite copper-cobalt project in northwest Alaska. Ongoing metallurgical studies indicate that cobalt occurs pre- dominantly as cobaltiferous pyrite, which would preferentially report to copper tail- ings following copper flotation. These studies indicate that a cobalt product may be produced on site and therefore justify reporting an initial cobalt resource in addition to the existing 5.5-billion-lb inferred copper resource. Over the next few months, Trilogy will complete flotation test work focused on concentrating cobalt into a pyrite-rich product that can be considered for further upgrading and recovery of cobalt metal at the Bornite site. The 77-million-lb contained cobalt in- ferred resource at Bornite is one of the largest cobalt resources in North America. (

Articles in this issue

Links on this page

Archives of this issue

view archives of Engineering & Mining Journal - JUL 2018