Abstract
An open-pit gold mine in the Mother-Lode mining region of the Sierras was essentially closed according to an accepted mine closure plan. However, because one element of the plan was not completed, due to technical disagreements, the entire mine site is now being re-examined, conceptually resulting, in revisions to the closure plans for the entire site. Elements of the mine include open-pits, a pit lake, waste rock piles, tailings pile, and a site wide surface water drainage system. Concerns to be re-addressed include: off site migration of dissolved metals in groundwater, stormwater sediment transport, revised criteria for side slope gradients of waste rock piles, disposition of pit lakes, and other complex issues.
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