Mine detail: Portland Group

Previously called 'Holland'

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Location

Lat / long:

42.11788, -123.51309

Resource(M)

Primary:	Gold
Secondary:	Silver
Gangue:	Quartz

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer
Production years:	1923

Geology

Host rock:	Applegate Group
Host type:	Argillite
Alteration processes:	Silicified, Bleached, Altered Shear Zone

References

MRDS	M060637
DEP	10042714
Reference	{Deposit:: RAMP, L. AND PETERSON, N.V., 1979, GEOLOGY AND MINERAL RESOURCES OF JOSEPHINE COUNTY, OREGON; ODGMI BULL. 100, 45P}{Deposit:: BROOKS, H.C. AND RAMP, L., 1968, GOLD AND SILVER IN OREGON; ODGMI BULL. 61, P.261}{Deposit:: OREGON METAL MINES HANDBOOK, 1942, ODGMI BULL. 14-C, VOL. 2, SEC. 1, P.212}{Production:: USBM}
Reporter	Ferns, Mark L. (Brooks, Howard C.), Gray, Jerry J., Johnson, Maureen G.