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Supervisors back pilot to inventory abandoned mines, protect water and plan mitigation
Summary
Chair Hall urged a proactive program to catalog abandoned mines, evaluate environmental risks (mercury, arsenic), and build relationships with state and federal agencies. The board directed staff to prepare a plan and return with short- and mid-term steps within roughly six months.
Nevada County supervisors discussed a broad initiative to identify and mitigate risks from abandoned and legacy mines after hearing a presentation from Chair Hall on environmental and public‑health concerns posed by old mine workings.
Chair Hall told the board that the county does not know the number or condition of many historic mines and that mercury, arsenic and other heavy metals can seep into creeks and drinking-water supplies. The presentation cited recent examples — including ongoing acid‑mine drainage concerns tied to sites such as Lava Cap and engineered…
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