Abstract
PT. Freeport Indonesia is one of the mining companies that process copper and gold ore. One type of ore processed in this company is Super Grade Ore (SGO). The characteristics of SGO are wet and smooth, which can result in some problems in transportation. Therefore, it is necessary to do the blending process using material from the Kokonao stockpile which tends to be drier and rougher but has a lower grade than the Cut of Grade of company. Applying the experimental method, this research aims to figure out the effects of the addition of Kokonao material in the blending process with SGO on concentrate grade and metal recovery results. Overall, the levels of Cu and Au reduce when the Kokonao material is added to each various composition, with the lowest Cu grade being 100% Kokonao (1,97%) and the highest Cu grade being 10% Kokonao (25,69%). Meanwhile, the lowest Au grade is 100% Kokonao portion (3,26 ppm) and the highest Au grade is 20% Kokonao (38,16 ppm). In addition, All various compositions result in Cu recovery that is higher than the company standard (>80%). The highest Cu recovery is the result of 50% Kokonao composition (97,12%).
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