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Montana Cyanide Process Open Pit Mining Prohibition, Initiative I-137 (1998)

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The Montana Cyanide Process Open Pit Mining Prohibition Initiative, also known as I-137, was a legislatively-referred constitutional amendment on the November 5, 2002 ballot in Montana, where it was approved.

Election results

I-137 (Cyanide Process Open Pit Mining Prohibition)
ResultVotesPercentage
Approveda Yes 169,991 52.3%
No155,03447.7%

Official results via: The Montana Secretary of State

Text of measure

The language that appeared on the ballot:

Cyanide leach mineral processing is the procedure used in mining operations that applies a cyanide-based solution over gold or silver ore to remove the precious metals from the waste rock, so the metals can be recovered. This measure would prohibit new open-pit gold and silver mines in Montana that use heap and vat cyanide leach processing. Any open-pit mines currently operating and permitted to use cyanide leach processing could continue to do so, but this measure would prohibit any expansion of these mines. If approved, this measure would be effective immediately. If approved, Montana would potentially lose taxes and royalties from new or expanded mining development. There would also be a potential reduction in the number of new mining jobs in Montana. However, the potential for state environmental liabilities may be reduced if cyanide leach mineral processing is eliminated.

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