Site Narrative
The history of the Lucky Green Mine and Mill Site is unclear but it is believed to have been in operation during 1940-1950's primarily as a vat leach operation using tin cans to precipitate the copper. The remains of the plant consist of concrete foundations and several large concrete vats partially filled with leached ore. The area has a conspicuous acrid odor that has given staff members severe headaches and "wooziness" when on site. The site is in a Wilderness Area and does receive recreational use, and may pose a human health hazard.
Previous/Existing Assessments
The locations and condition of the mine and mill features were compiled by the Needles FO and by contractor in June 1998. At this time excessive levels of thallium was discovered in an open water well and copper in excess of 45% was identified in a pile of mill process sludge.
Reclamation/Recommendations
The previous study, conducted by Environmental Dynamics, identified thallium in the water well at five times the California MCL, and a small amount of dried sludge with up to 454,000 ppm copper. Additionally, approximately 20,000 cubic yards of stockpiled aggregate have copper concentrations exceeding the State TTLC criteria. The study recommended, at a minimum, removal of the copper contaminated sludge, residues on the processing floor, and the contents of Tank C and surrounding soil.
Estimated Costs
A plan to mitigate this site beginning with additional characterization and eventual removal of hazardous material could range from a minimum of $30,000-$40,000 to over $400,000, depending on the extent of removal and Wilderness tool restrictions.
Risks: Human health, water quality
AMLIS #: CA036900002
Location: N34 16 15, W114 24 08
Field Office: Needles
Congressional District: 41
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