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Gold assaying is essential in determining the amount of gold in a mineral deposit. The process involves bringing a rock sample, most often a core obtained through drilling, to a laboratory where it is examined by experts. Assay results are often mapped and used to pinpoint targets for future drill programs.
In 1998, approximately70% of gold recovered from cyanide use was from vat-leaching operations, about 30% fromheap-leaching operations. 3 All in all, cyanide leaching is now used to process over 90% ofgold ores (by weight) mined in the United States.4 The use of cyanide in mining is becoming more and more controversial.n 1998, approximately70% of gold recovered from cyanide use was from vat-leaching operations, about 30% fromheap-leaching operations. 3 All in all, cyanide leaching is now used to process over 90% ofgold ores (by weight) mined in the United States.