Grasberg Block Cave is an underground mine passed under an open mine Grasberg Reserve, with the "... more Grasberg Block Cave is an underground mine passed under an open mine Grasberg Reserve, with the "Cu-Au Porphyry" deposit type, located within the Contract of Work A (COW "A") of PT. Freeport Indonesia, Ertsberg District, Papua. The reserve until late of January 2015 was 1.011 million tonnes with 1% copper (Cu) and gold (Au) 0.77 g / t. Grasberg Block Cave is a porphyry deposit where the highest Cu-Au grade hosted within stock work material in a horse-shoe shape at the margin of barren core Kali diorite. Metallurgy performance reflected in ore type is required by mine engineer to get an optimal metal target. Clean ore type will produce higher metal recovery compared to problematic ore material. Identification of problematic ore at the Block Cave Grasberg underground mine, discussed in the paper, is expected to be useful in the mining process. The problematic ore study on Grasberg Block Cave reserves was conducted to determine the characteristics and controls of mineralogy in this type of ore in order to reduce losses due to reduced acquisition of valuable ore minerals. Methods used were geological mapping and field sampling, XRD analysis for selected samples from drilled core rocks, and geo-metallurgical analyzes performed in the laboratory. Troubled ore types based on Freeport Indonesia's geo-metallurgical standards, as in the Grasberg open pit, are also predicted to be found in the Grasberg Block Cave. This ore is affected by impurity minerals such as mineral sericite-clay> 10%, pyrite> 5%, and mica> 15%. Therefore, geological observation in the field combined with laboratory analysis is essential to find out the problematic ore in the Block Cave Grasberg underground reserve. Keywords: Grasberg block cave reserve, mineralogy problematic ore and test geometallurgy
Grasberg Block Cave is an underground mine passed under an open mine Grasberg Reserve, with the "... more Grasberg Block Cave is an underground mine passed under an open mine Grasberg Reserve, with the "Cu-Au Porphyry" deposit type, located within the Contract of Work A (COW "A") of PT. Freeport Indonesia, Ertsberg District, Papua. The reserve until late of January 2015 was 1.011 million tonnes with 1% copper (Cu) and gold (Au) 0.77 g / t. Grasberg Block Cave is a porphyry deposit where the highest Cu-Au grade hosted within stock work material in a horse-shoe shape at the margin of barren core Kali diorite. Metallurgy performance reflected in ore type is required by mine engineer to get an optimal metal target. Clean ore type will produce higher metal recovery compared to problematic ore material. Identification of problematic ore at the Block Cave Grasberg underground mine, discussed in the paper, is expected to be useful in the mining process. The problematic ore study on Grasberg Block Cave reserves was conducted to determine the characteristics and controls of mineralogy in this type of ore in order to reduce losses due to reduced acquisition of valuable ore minerals. Methods used were geological mapping and field sampling, XRD analysis for selected samples from drilled core rocks, and geo-metallurgical analyzes performed in the laboratory. Troubled ore types based on Freeport Indonesia's geo-metallurgical standards, as in the Grasberg open pit, are also predicted to be found in the Grasberg Block Cave. This ore is affected by impurity minerals such as mineral sericite-clay> 10%, pyrite> 5%, and mica> 15%. Therefore, geological observation in the field combined with laboratory analysis is essential to find out the problematic ore in the Block Cave Grasberg underground reserve. Keywords: Grasberg block cave reserve, mineralogy problematic ore and test geometallurgy
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