Engineering & Mining Journal

AUG 2017

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Page 7 of 99

REGIONAL NEWS - U.S. & CANADA 6 E&MJ • AUGUST 2017 Pretium Pours First Gold at Brucejack Pretium Resources announced on June 30 it has poured the fi rst gold at its Brucejack mine in northwest British Columbia and followed up with an an- nouncement on July 7 that the mine has reached commercial production. The gold pour announcement included a report that Brucejack's fl otation and gravity cir- cuits are operational and that gold-silver fl otation concentrate is being produced and bagged, with initial shipments sched- uled to depart in the near term. The commercial production date was defi ned as the fi rst day of the calendar month immediately following the fi rst calendar month during which the Bruce- jack plant processed ore at an average rate of 60% of monthly nameplate ca- pacity. Annual processing capacity is 985,500 metric tons per year (mt/y) or 2,700 mt per day (mt/d). During June, the Brucejack plant pro- cessed 70,805 mt (87.4% of monthly nameplate capacity) for an average of 2,360 mt/d. Higher-grade ore was being introduced into the plant as work contin- ued on optimizing recoveries in the gravi- ty and fl otation circuits. The Brucejack mine is located approx- imately 950 kilometers (km) northwest of Vancouver and 65 km north of Stewart, British Columbia. The 330-person Bruce- jack camp, which includes the mine dry, offi ces, recreation facilities, dining hall, and kitchen, was fully commissioned and operational in early February. Brucejack is scheduled to produce an average of 504,000 ounces per year (oz/y) of gold over its fi rst eight years of operation and a mine-life average of 404,000 oz/y over 18 years. September Gold Pour Targeted for Rainy River New Gold Inc. reported in late June that it is targeting fi rst gold production from its Rainy River project in northwest On- tario in September, with the project ex- pected to reach commercial production in November. Project planning calls for production of 325,000 oz/y of gold at full production. The processing rate will be 21,000 mt/d from a combination of open- pit, underground and stockpiled ore. Project spending for Rainy River to- taled $903 million through March, and spending of an additional $389 million was planned through to the start of com- mercial production. The Rainy River project currently has 3.9 million oz of gold in reserves and 2.3 million oz of gold in measured and indi- cated resources. The Rainy River property is located in Richardson township in northwest Ontario, approximately 160 km south of Kenora and 420 km west of Thunder Bay. Excellent infrastructure includes year-round road access and powerlines in close proximity to the site, as well as a railway 21 km to the south. The town of Fort Frances 66 km southeast of the site has a population of approximately 10,000 people, eliminating the need to establish a camp at site. "We are pleased with the solid progress we have made at Rainy River over the last fi ve months," said New Gold President and CEO Hannes Portmann. "Through the second quarter, our team has both successfully commenced the staged com- missioning of our process facility and delivered on our mining plan. As the pit has opened up, our operations team has recently delivered further increases in the mining rate, including several days of pro- duction of more than 130,000 mt/d." The primary crusher and conveyor system were commissioned on schedule, and the fi rst crush occurred on May 11. Commissioning of the refi ning portion of the circuit began in July, and dry and wet commissioning of the full process circuit was scheduled for August. Alcoa Plans Partial Restart of Warrick Smelter Alcoa Corp. announced plans to restart three of fi ve potlines at its Warrick Oper- ations aluminum smelter near Evansville, Indiana. The process to restart the three lines, with 161,400 mt of annual capac- ity, will begin immediately and is expect- ed to be complete in the second quarter of 2018. The three potlines will direct- ly supply the Warrick rolling mill, which serves the North American market with fl at-rolled aluminum. "By restarting a portion of the War- rick smelter, we will provide an effi cient source of metal for the co-located roll- ing mill and help it meet an anticipated increase in production volumes," said Tim Reyes, president of Alcoa's Alumi- num business unit. "The action will en- able us to more fully utilize the assets at this integrated site for the benefi t of our investors, customers, employees and the community." The smelter at Warrick closed in March 2016. Brucejack's fi rst gold dore bar (inset) was poured on June 30.

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