Biooxidation process for recovery of gold from heaps of low-grade sulfidic and carbonaceous sulfidic ore materials
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United States of America Patent
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Sep 21, 1993
Issued Date -
N/A
app pub date -
Oct 18, 1992
filing date -
Jul 10, 1991
priority date (Note) -
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Abstract
A process for biooxidation of sulfides in a heap of mineral ores by freeing precious metals dispersed or occluded within said ores as pyritic or arsenopyritic sulfides and the like; the process comprises forming particulates from ore particles with an inoculate comprising bacteria capable of attacking, by biooxidation, sulfides and/or elemental sulfur in said ore particles; from these particulates a heap is constructed; and the biooxidation takes place in such heap by adding to or dispersing within the heap a leaching solution, circulating the leaching solution within the heap and recovering the precious metal values from the heap; recovery may be accomplished with a cyanide, thiourea, or a thiosulfate lixiviant.
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