heap leaching


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heap leaching

[′hēp ‚lēch·iŋ]
(metallurgy)
A process used for the recovery of copper from weathered ore and material from mine dumps; material is laid to a thickness of 20 feet (6 meters) in alternately fine and coarse beds and treated with water at intervals during which oxidation occurs; liquor that runs off is treated with scrap iron to precipitate copper.
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Further metallurgical test work on heap leaching is ongoing to determine the extent of the impact on gold resources and reserves.
This Pan project is a low cost, oxidized, Carlin-style gold deposit mineable by shallow open pit methods and treatable by heap leaching.
Mining a series of staged open pits with treatment at the Greenfields Mill, working with Norton Gold Fields on the license to mine for the Castle Hill Stage 1 development and unlocking the value of mined lower grade ore using heap leaching technology.
Heap leaching is usually used to extract uranium from low grade ore of which the uranium content is too low to be economically processed in a uranium mill.
The addition of a heap leaching circuit to the Murchison gold project will increase the annual gold production.
There have been some notable green victories: Montana has banned the use of cyanide heap leaching (effectively killing the industry there), California has introduced prohibitively strict water-use rules, and activists in Washington recently blocked the proposed Crown Jewel mine.
Cyanide, he says, has allowed heap leaching, and heap leaching lets mines profitably work deposits that otherwise would stay in the ground.
At a time when heap leaching was in its infancy, many problems, unsurprisingly, were encountered.
What you'll see: open pits, mills, heap leaching, maybe a mine shaft
Annual production is estimated at 70 million pounds of copper cathode over 12 years, using open-pit mining, heap leaching of copper ore at run-of-mine size, solvent extraction and electrowinning.
The BHP Heap Leaching program has provided Bureau Veritas the opportunity to expand their existing capabilities at the Wingfield laboratory in Adelaide, South Australia, to now include comprehensive heap-leaching capability from small-scale through to demonstration scale, as well as other pilot plant facilities for mineral flotation, complex metal extraction and recovery studies.
has been engaged to oversee and co-ordinate a select team of engineers who will conduct Engineering studies to evaluate options for a copper heap leaching operation at Canariaco, Northern Peru.