Engineering & Mining Journal

AUG 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

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Page 68 of 107 E&MJ • AUGUST 2018 67 had to start closure activities, reducing our footprint and our workforce. We made it an urgency to extend the mine life." Considering the space limitations Cerro Corona faces in Cajamarca, achieving this took its share of engineering and creativity. Alberto Cárdenas, vice-president of opera- tions at Gold Fields, commented: "The beau- ty of the solution is that we are not extending the superficial footprint. We are challenging the density of the tailings to accommodate more volume within the same facility. Also, at the end of the day, the pit is also an asset, so we are looking at placing some tailings within the pit after the operation." Also in Cajamarca, Tahoe Resources con- tinues to ramp up its operation at Shahuin- do, where it is commissioning a crushing and agglomeration (C&A) plant to improve recov- eries from the fines of the ore body (produc- tion of 79,000 ounces in 2017 came from run-of-mine ore). Once the plant is commis- sioned, Tahoe will embark on the expansion of Shahuindo from 12,000 mt/d to 36,000 mt/d. "Our other Shahuindo projects, such as resourcing water, constructing pads and building a transmission line, are also key. Near-mine and satellite geological deposits in the north corridor of Shahuindo provide us potential targets to extend and maximize value at this operation," said Phil Dalke, un- til recently vice-president and managing di- rector of Tahoe Peru. Peruvian companies account for sig- nificant gold production as well. These in- clude Poderosa (254,000 oz/y), Horizonte (253,000 oz/y), and Hochschild Mining, tra- ditionally a primary silver producer, that has been increasingly leaning towards gold pro- duction with the impulse of the Inmaculada mine. Hochschild produced 203,600 oz of gold in Peru last year, and 165,000 of those ounces came from this flagship asset. With respect to Poderosa, the company is currently expanding its processing capacity from the combined 1,400 mt/d in between its Marañón and Santa María plants, to 1,600 mt/d by the end of this year. One of the main items of the expansion in terms of the capex are the tailings dams, explained Marcelo Santillana, general manager of Poderosa: "With the investments in the Liv- ias and Hualanga facilities, the tailings dams will now have a life of 22 years. Moreover, we filter the tailings, so we do not deal with pulp anymore." Poderosa expects to produce 270,000 ounces of gold this year and continues to look at formulas to optimize production and extend mine-life. Elsewhere in La Libertad, Corporación del Centro (CDC Gold) is advancing the El Toro

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