A and B Mine
Nevada · Nye County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Historical mapped workings available
Mixed Underground / Surface
Records documenting both surface and underground work. · 1280 records
Mixed surface/underground sites may include open cuts, pits, or glory holes alongside shafts or levels.
Catalog eligibility still requires underground evidence; surface-only properties are not treated as underground mines.
A and H Claim
Nevada · Humboldt County
Unconfirmed Gold Occurrence Mixed Underground/Surface
Documented shaft evidence
A-1 Claims
Arizona · Graham, Greenlee County
Unconfirmed Manganese Producer Mixed Underground/Surface
Documented shaft evidence
Abe Lincoln Mine
Arizona · Pima County
Unconfirmed Copper Occurrence Mixed Underground/Surface
Accord Mine
Arizona · Gila County
Unconfirmed Manganese Occurrence Mixed Underground/Surface
Historical mapped workings available
Adelaide and Anderson
California · Mariposa County
Unconfirmed Gold Past Producer Mixed Underground/Surface
Historical mapped workings available
Adobe Canyon Group
California · Stanislaus County
Unconfirmed Chromium Past Producer Mixed Underground/Surface
Advance
Nevada · Lincoln County
Unconfirmed Gold Past Producer Mixed Underground/Surface
Historical mapped workings available
Aetna
California · Napa County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Documented adit evidence
Aetna Extension
California · Napa County
Unconfirmed Mercury Occurrence Mixed Underground/Surface
Historical mapped workings available
Afterthought
Nevada · Churchill County
Unconfirmed Lead Past Producer Mixed Underground/Surface
Aguinaldo Mine Group
Arizona · Pima County
Unconfirmed Lead Past Producer Mixed Underground/Surface
Historical mapped workings available
Ajax Mine Group
Arizona · Pima County
Unconfirmed Gold Producer Mixed Underground/Surface
Historical mapped workings available
Ajo Peak Mine
Arizona · Pima County
Unconfirmed Copper Producer Mixed Underground/Surface
Documented shaft evidence
Akoz
California · Mariposa County
Unconfirmed Zinc Past Producer Mixed Underground/Surface
Alameda
California · Placer County
Unconfirmed Gold Past Producer Mixed Underground/Surface
Historical mapped workings available
Alamo Prospects
Arizona · Gila County
Unconfirmed Asbestos Occurrence Mixed Underground/Surface
All Canadian Copper Claims
Nevada · Esmeralda County
Unconfirmed Copper Prospect Mixed Underground/Surface
Historical mapped workings available
Allison-Merrimac Group
California · Calaveras County
Unconfirmed Gold Past Producer Mixed Underground/Surface
Alpine
California · San Benito County
Unconfirmed Mercury Past Producer Mixed Underground/Surface
Documented adit evidence
Alpine
California · Alpine County
Unconfirmed Gold Past Producer Mixed Underground/Surface
Alpine Mine
Nevada · Pershing County
Unconfirmed Tungsten Producer Mixed Underground/Surface
Alps Mine
Nevada · Lincoln County
Unconfirmed Silver Past Producer Mixed Underground/Surface
Historical mapped workings available
Alta
California · Calaveras County
Unconfirmed Gold Producer Mixed Underground/Surface
Documented adit evidence