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County staff maps 39 known mines, proposes internal dashboard and public education

Nevada County Board of Supervisors Workshop · January 30, 2026
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

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…

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