INNOVATION May-June 2017

Discovery of Boleras Silver Deposit, Sandra Escobar Project, Mexico In 2016, Orex Minerals Inc. and their joint venture partner Canasil Resources Inc. discovered a new silver deposit in northern Mexico. In less than a year, Orex has

This discovery is relatively unique within the Mexican “Silver Trend” in that, unlike the traditional vein- hosted epithermal silver systems, the silver mineralization at Boleras is strataform along a rhyolite horizon and contains primarily disseminated silver-bearing minerals, with lesser broad stockwork zones. Few sulphides and no gossan are found at surface to mark the location. APEGBC members, Orex Minerals Inc.: Ben Whiting, P.Geo., Dale Brittliffe, P.Geo., Art Freeze, P.Geo., Rob van Egmond, P.Geo.

completed drilling to define a first resource estimate on the Boleras Silver Deposit. Fifty-nine diamond- drill holes, totalling just under 7,500 metres, have been used to delineate an inferred resource of 9.8 million tonnes, grading 106 grams per tonne silver, for a total of 945 tonnes (33.3 million ounces) of silver.

Building mine facilities in remote, high-elevation environment

plant, a 330-person permanent camp, and a 20-MVA substation. The project’s design, logistics and construction must take into account high winds, snow loading, ice buildup and low temperatures. Addressing these issues has proven vital to the safety of more than 900 employees and contractors at the site and to the overall success of Brucejack mine. APEGBC members, Amec Foster Wheeler: Eric Young, P.Eng., Alan Keylock, P.Eng., Raymond Lo, P.Eng., Ryan Hempton, P.Eng., Regina Voron, P.Eng.

Pretium Resources, Inc.’s Brucejack mine is a world-class, high-grade underground gold mine located northwest of Stewart, BC. The remote site is reached by a 54-kilometre gravel access road, followed by a 12-kilometre ice road over the Knipple Glacier. Amec Foster Wheeler is providing detailed engineering, procurement and site construction–assistance services for this project. Facilities include mine-ventilation fans, underground ore crushing and conveying, an ore concentrator with grinding mills, flotation and dewatering equipment, a water treatment

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