Montana Code 82-4-390. Cyanide heap and vat leach open-pit gold and silver mining prohibited
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82-4-390. Cyanide heap and vat leach open-pit gold and silver mining prohibited. (1) Open-pit mining for gold or silver using heap leaching or vat leaching with cyanide ore-processing reagents is prohibited except as described in subsection (2).
(2)A mine described in this section operating on November 3, 1998, may continue operating under its existing operating permit or any amended permit that is necessary for the continued operation of the mine.