A and H Claim
Nevada · Humboldt County
Unconfirmed Gold Occurrence Mixed Underground/Surface
Documented shaft evidence
Development Status: Occurrence
715 underground-eligible catalog records with this USGS development status.
Development status is not verification status
USGS development status (Producer, Past Producer, Prospect, Occurrence) describes the source record’s development context. UndergroundMines verification status (Unconfirmed, Verified, etc.) is a separate community/admin confirmation layer.
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
Ackers
California · Fresno County
Unconfirmed Copper Occurrence Underground
Aetna Extension
California · Napa County
Unconfirmed Mercury Occurrence Mixed Underground/Surface
Historical mapped workings available
African Prospect
Arizona · Mohave County
Unconfirmed Gold Occurrence Underground
Historical mapped workings available
Alamo Prospects
Arizona · Gila County
Unconfirmed Asbestos Occurrence Mixed Underground/Surface
Alcyone Prospect
Arizona · Mohave County
Unconfirmed Gold Occurrence Underground
Historical mapped workings available
Allison
California · Amador County
Unconfirmed Gold Occurrence Underground
Alphi Alpi
California · Amador County
Unconfirmed Gold Occurrence Underground
Historical mapped workings available
Alto Divide Mine
Nevada · Esmeralda County
Unconfirmed Gold Occurrence Underground
Historical mapped workings available
Ama Oro
California · Amador County
Unconfirmed Gold Occurrence Underground
American Prospect
Arizona · Mohave County
Unconfirmed Manganese Occurrence Mixed Underground/Surface
Americus
California · Shasta County
Unconfirmed Copper Occurrence Underground
Amoron-Rainbow Group
Nevada · Elko County
Unconfirmed Gold Occurrence Underground
Historical mapped workings available
Anaco
California · San Bernardino County
Unconfirmed Zinc Occurrence Mixed Underground/Surface
Anderson
California · Riverside County
Unconfirmed Copper Occurrence Underground
Documented shaft evidence
Ann Belcher
California · Sonoma County
Unconfirmed Mercury Occurrence Underground
Apache Extension Mine
Arizona · Gila County
Unconfirmed Asbestos Occurrence Underground
Documented adit evidence
Apex No. 1 Claim
Nevada · Humboldt County
Unconfirmed Gold Occurrence Mixed Underground/Surface
Historical mapped workings available
Arcturus Mine
Nevada · Pershing County
Unconfirmed Tungsten Occurrence Mixed Underground/Surface
Documented adit evidence
Argo Group
Nevada · Humboldt County
Mindat Confirmed Tungsten Occurrence Underground
Documented shaft/adit evidence
Arkansas & Arizona Prospect
Arizona · Yavapai County
Unconfirmed Copper Occurrence Underground
Historical mapped workings available
Arrowhead Consolidated Mines Co.
Nevada · Nye County
Unconfirmed Silver Occurrence Underground
Documented shaft evidence