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County staff maps 39 known mines, proposes internal dashboard and public education
Summary
Staff presented a county inventory of known mines (39 sites, 23 on public land), recommended an internal geospatial dashboard to inform planning, and proposed a public-facing fact sheet or web page for education while keeping parcel-level mine hazard maps internal to avoid encouraging unsafe visitation.
County planning staff reported results of a year-long review of historic mine features across Nevada County and proposed actions to reduce public safety risks and better integrate mine data into planning.
Alex Keeble Toll presented the analysis and said staff identified 39 known mines in the county, 23 of which are on public lands. He recommended keeping detailed mine-hazard mapping internal (an "internally accessible geospatial dashboard") to permit county departments to weigh mine hazards in wildfire mitigation, recreation planning and project siting while avoiding publicly posting parcel-level maps that might attract unsafe exploration of mine features.
Keeble Toll recommended an Office of Emergency Services web page with simple, high-level guidance for residents (how to recognize hazards, where to seek technical help) and proposed incorporating mine-hazard awareness into the county's hazard mitigation and safety-element planning work.
Board members asked for follow-up on specific legacy sites (including the Blue Lead Mine) and for a one-page fact sheet about county authority and responsibilities; staff said the public-lands mapping allows better coordination with state and federal partners and that private-property mine issues remain the responsibility and liability of property owners, who should consult geotechnical experts if needed. Staff estimated six months to complete community education materials and website materials with no additional fiscal impact beyond staff time.
Next steps: staff will finalize the internal mapping dashboard, prepare public education materials and return to the board with a brief factual summary of county roles and legal limits regarding private-property mine hazards.
