Gold recovery efficiency from operating heap leaches is typically ∼70%, although it can range from 50% to 90%. Silver recovery efficiency is typically ∼55%. Most gold heap leaches apply cyanide within a range of 200–600 mg/L NaCN. Silver-bearing ores should usually be leached with a cyanide level of 600–1000 mg/L NaCN.

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As of December 31, 2014, we had an estimated NRM of 1.7 million tons, with 10.9 grams per ton of gold, 286.1 grams per ton of silver, 2.1 percent lead and 3.5 percent zinc. In 2015 we will focus our exploration efforts in the Blanquita and Mayra veins.

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Naimi et al. 62 found that the mean particle diameter of grinds after the hammer milling of pine was about four to seven times smaller than the hammer …

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The results confirmed NRM of 16,330 metric tons at 16.9 grams per ton of gold and 6.6 ounces per ton of silver with an average width of 1.1 meters. In 2004, we continued our exploration efforts, investing US$1.2 million in 1,703 meters of tunneling and 1,710 meters of diamond drilling in the Hatun Orcco Sur prospect.

Abstract. This chapter considers comminution for gold ores, starting with breakage induced in the blasting process, continuing through primary crushing, primary milling, and secondary milling. Both technical and operational considerations are reviewed; while gold ore comminution is broadly similar to like-sized circuits for other mineral ...

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As of December 31, 2012, we had estimated NRM of 147,096 dry short tons, or DST, with 9.26 ounces per ton of silver, 0.016 ounces per ton of gold, 1.68 percent lead and 1.23 percent zinc. Mallay. Our exploration efforts in this area include the old Chanca silver mine and surrounding area of Chanca, which encompasses the Candelaria, Santa Rosa ...

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