Martha Mine (Greenback Group), Coyote Creek District, Josephine Co., Oregon, USALocated in the SW¼, Section 28, Township 33 South, Range 5 West, Willamette Meridian.
Quartz veins in greenstone.
Ref: Oregon Metal Mines Handbook, 1952, Oregon Department of Geology and Mineral Industries: Bulletin No. 14-C, Vol. 2, Section 1 - Josephine Co., 2nd Edition, page 112.
6 entries listed. 6 valid minerals.
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