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

MRDS	M009042
MAS	60330012
DEP	10139161
Reference	{Deposit:: USBM R.I.5579,1960}{Deposit:: CDMG,BULL.152,1950}{Deposit:: CDMG,BULL.125,1943}{Deposit:: USGS FILE,1918}
Reporter	Deino, Al