 | Miller River Mining District, King County, Washington, USA |
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LOCALITY IMAGES
GEOLOGY
Snoqualmie Batholith (Northern Stock) - late Oligocene to early Miocene (28 Ma[million years ago] to 22 Ma)
Numerous well-defined southeast- to southwest-dipping mineralized veins in sheared granodiorite of the Snoqulamie Batholith are present along the cliffs that define the edge of the Coney Creek basin, a broad, hanging cirque valley.
Development work consisted of 3,000 feet of adits (on two levels) and about 100 feet of shafts and raises starting in 1894 and ending in 1897 when an explosion outside the mine killed several men. Ore containing gold, silver, lead and zinc were extracted during this period.
MINERALS
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| PbCuSbS3 - Euhedral crystals to about 1/4 inch reported in veins |
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| SiO2 - small crystals in veins associated with sulfides |
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| ZnS - small euhedral crystals in veins |
* photographed
BOURNONITE with SPHALERITE and QUARTZ |
1934 Prosectus: The Coney Basin Mine, Inc., Owners of 14 Valuable Mineral Claims in the Miller River Mining District, King County, Washington.
State of Washington Division of Natural Resources, Division of Mines and Geology, Livingston, Vaughn E., Jr. (1971): Geology and Mineral Resources of King County, Washington, Bulletin No. 63, 200 pages.