No. 1 and No. 2
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.
Orejana Mine
Arizona · Graham County
Unconfirmed Lead Prospect Underground
Documented shaft/adit evidence
Panama Mine.
Arizona · Graham County
Unconfirmed Lead Prospect Underground
Historical mapped workings available
Philadelphia
California · Amador County
Unconfirmed Gold Prospect Underground
Documented shaft evidence
Plymouth-Eureka
California · Amador County
Unconfirmed Gold Prospect Underground
Price
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Quien Sabe Mine
California · San Benito County
Unconfirmed Antimony Prospect Underground
Documented shaft/adit evidence
Rare Metals Mine
Arizona · Pinal County
Unconfirmed Copper Prospect Underground
Documented shaft evidence
Red Oak
California · Amador County
Unconfirmed Gold Prospect Underground
Historical mapped workings available
Riek Property
Nevada · Esmeralda County
Unconfirmed Mercury Prospect Mixed Underground/Surface
Documented shaft evidence
Shotgun Creek Mine
California · Shasta County
Unconfirmed Iron Prospect Underground
Siskon Property
Nevada · Esmeralda County
Unconfirmed Molybdenum Prospect Mixed Underground/Surface
Sisson & Peagram Prospect
Arizona · Maricopa County
Unconfirmed Manganese Prospect Mixed Underground/Surface
Historical mapped workings available
Unnamed Prospect
Arizona · Graham County
Unconfirmed Lead Prospect Underground
Historical mapped workings available
Veteran-Tripp Underground
Nevada · White Pine County
Unconfirmed Copper Prospect Underground
Historical mapped workings available
Windmill Mine
Nevada · Clark County
Source Corroborated Gold Prospect Underground
Documented shaft evidence