| 11. | The heap leaching operations provided 4, 148 ounces.
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| 12. | In 1987 Carpentaria Gold Ltd opened a new open cut mine using modern heap leaching processes.
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| 13. | Thus, a unique feature of nickel heap leaching is the need for a tailings disposal area.
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| 14. | Almost all the gold in Nevada comes from large open pit mining and with heap leaching recovery.
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| 15. | The expansion is for heap leaching, a process in which acid is filtered through piles of copper ore.
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| 16. | Iron pyrite was heaped up and allowed to weather ( an example of an early form of heap leaching ).
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| 17. | Although the heap leaching is a low cost-process, it normally has recovery rates of 60-70 %, although there are exceptions.
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| 18. | Once the ore is mined it can be treated as a whole ore using a dump leaching or heap leaching processes.
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| 19. | Small amounts of uranium were also produced by underground in-situ leaching and heap leaching of low grade ore and even waste rock.
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| 20. | The method known as heap leaching was first proposed in 1969 by the US'Bureau of Mines, and was in use by the 1970s.
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