Acme Cons
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Development Status: Prospect
40 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.
A property may have Development Status: Prospect while still having documented underground workings. UndergroundMines only includes it when source evidence supports actual underground development.
All Canadian Copper Claims
Nevada · Esmeralda County
Unconfirmed Copper Prospect Mixed Underground/Surface
Historical mapped workings available
Ann Mason Copper Deposit
Nevada · Lyon County
Unconfirmed Copper Prospect Underground
Historical mapped workings available
Ann Mason Deposit
Nevada · Lyon County
Unconfirmed Copper Prospect Underground
Historical mapped workings available
Belmont
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Blue Claims
Nevada · Humboldt County
Unconfirmed Gold Prospect Mixed Underground/Surface
Documented shaft evidence
Cappy's Diggins
Nevada · White Pine County
Unconfirmed Silver Prospect Underground
Casa Grande Santa Cruz
Arizona · Pinal County
Unconfirmed Copper Prospect Underground
Comet
California · Amador County
Unconfirmed Gold Prospect Underground
Documented shaft evidence
Dutch Flat Mine Area
Nevada · Humboldt County
Unconfirmed Mercury Prospect Mixed Underground/Surface
Historical mapped workings available
Forty Nine
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Gold King Group
Nevada · White Pine County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Golden Star Group
Arizona · Mohave County
Unconfirmed Gold Prospect Mixed Underground/Surface
Historical mapped workings available
Jumper and Mount Vernon Mines
California · Lassen County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Kernick Mine
Nevada · Mineral County
Unconfirmed Gold Prospect Mixed Underground/Surface
Maryland
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
McFadden Peak
Arizona · Gila County
Unconfirmed Fluorine-Fluorite Prospect Mixed Underground/Surface
Midway and Esmeralda
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Monitor
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Monte Cristo Prospect
Nevada · Nye County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
NBMG Sample Sites 1985 and 1986 - Mine
Nevada · Esmeralda County
Unconfirmed Silver Prospect Underground
Historical mapped workings available
Negro Head Iron Deposit
California · San Bernardino County
Unconfirmed Iron Prospect Mixed Underground/Surface
Historical mapped workings available
Nevada Crown Shafts
Nevada · Churchill County
Unconfirmed Silver Prospect Underground
New London
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available