December 2000
Volume 52    Issue 12

Banning cyanide use at McDonald -- an attack on open-pit mining

Mining Engineering , 2000, Vol. 52, No. 12, pp. 0-8
De Voto, Richard H.; McNulty, Terry P.

The McDonald gold project and two satellite gold deposits near Lincoln, MT were discovered in the early 1990s. They contain at least 307.9 t (9.9 million oz) of gold and 933 t (30 million oz) of silver. The McDonald gold deposit alone contains 223.9 t (7.2 million oz) of gold reserves that can be open-pit mined and processed by cyanide heap leaching at a projected cash operating cost of $6.10/g ($190/oz).

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