Mine detail: Helmke Manganese Group

Previously called 'Schoolhouse No.1 Claim'

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Location

Lat / long:

40.13065, -123.50001

Resource(M)

Tertiary:	Manganese
Discovery year:	1942

Production

Operation type:	Surface
Development status:	Prospect

Geology

References

MRDS	M020352
MAS	61050062
DEP	10263033
Reference	CA BULL 152 1950 P 334
Reporter	Western Field Operations Center (WFOC)