Geology · Glossary
Mine Hazard / ARMR
Updated 2026-07-20
Former mines and mapped mineral lands can leave shafts, adits, or contamination risk. Screen historic mining maps and confirm with local records before grading.
What it means
Former mines and mapped mineral lands can leave shafts, adits, or contamination risk. Screen historic mining maps and confirm with local records before grading.
Why it matters for land decisions
Confirm how the concept applies to your specific parcel with the city or county planning department and the controlling agency map or ordinance.
- Treat online GIS as a first-pass screen.
- Verify before design, escrow, or lending decisions.
People also ask
What is Mine Hazard / ARMR?
Former mines and mapped mineral lands can leave shafts, adits, or contamination risk. Screen historic mining maps and confirm with local records before grading.
Is a GIS overlay enough to decide?
No. Public GIS is a screening tool. Official determinations come from the governing agency, recorded documents, and licensed professionals when required.
Official sources
Related terms
Check this on a California parcel
Parcel View screens zoning, flood, fire, soils, and planning layers for any California lot — every finding linked to the official source.