leach material

leach material

[′lēch mə‚tir·ē·əl]
(mining engineering)
Material sufficiently mineralized to be economically recoverable by leaching.
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References in periodicals archive ?
For the first nine months of fiscal year '96, the Crescent Pit has produced 41,105 ounces of gold from mill-grade material, and 11,780 ounces from heap leach material.
Mill ounces increased 23%, which was offset somewhat by lower ounces from the heap leach pads due to the stockpiling of low grade sulfide heap leach material.
PDUS is currently studying the feasibility of recovering gold from lower grade, heap leach material in the Crescent Pit.
The residual tail material after the gravity separation process produced an average weighted recovery in cyanide bottle roll tests of approximately 84% for gold and 71% for silver, which is similar to the average gold recovery from the oxide heap leach material.
Vector Engineering has completed its preliminary infrastructure study for the layout of heap leach pads, dumps and basic infrastructure to support a mining operation producing approximately 150,000 tonnes of copper cathode per year from both heap and dump leach material.
The results also show that additional gold extraction can be achieved from the existing heap leach material after crushing.
The Gossey, Sokadie and Korezeina prospects will also receive additional drilling to evaluate their potential as large sources of lower-grade heap leach material.
Production from the heap leach material in 2004 is expected to be about 75,000 ounces of gold at an estimated cash cost of $211 per ounce.
5 million-tons of heap leach material mined and placed on the pad since the late 1990s.
Gold production levels at the mine have decreased significantly compared to the corresponding previous quarter due to production shortfalls caused by placing of heap leach material with slower than expected metal recoveries during the final mining stages.
The year over year sales revenue decrease is due to production shortfalls caused by production interruptions and "placing" of heap leach material with slower than expected metal recoveries during the final mining stages of the Rawhide operation.