Mine detail: Gravelly Valley

Previously called 'Toy Young'

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Location

Lat / long: 39.44627, -122.97829

Resource(M)

Tertiary: Silica, Manganese
Other material: Chert, Psilomelane, Pyrolusite
Discovery year: 1918

Production

Operation type: Surface-Underground
Development status: Past Producer
First production started: 1942

Geology

References

MRDSM009042
MAS60330012
DEP10139161
Reference{Deposit:: USBM R.I.5579,1960}{Deposit:: CDMG,BULL.152,1950}{Deposit:: CDMG,BULL.125,1943}{Deposit:: USGS FILE,1918}
ReporterDeino, Al