Mine detail: Portland Mine

Previously called ''

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Location

Lat / long:

37.70051, -117.21785

Resource(M)

Primary:	Gold
Gangue:	Pyrite
Discovery year:	1906

Production

Operation type:	Unknown
Deposit type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host type:	Tuff,Latite,Andesite,Basalt
Associated rock:	Milltown Andesite;Siebert Tuff
Associated type:	Latite,Andesite,Basalt
Alteration processes:	Strong Alteration

References

MRDS	M241887
DEP	10046688
Reference	{Deposit:: RANSOME, F.L., 1909, USGS PP 66, P. 245}{Deposit:: NBMG REPORT 33, P. 77-86.}
Reporter	La Pointe, D.D. (Tingley, J.V.)