Glacier Peak Mine, Glacier Peak Mining District, Snohomish County, Washington, USAi

Regional Level Types
Glacier Peak Mine	Mine
Glacier Peak Mining District	Mining District
Snohomish County	County
Washington	State
USA	Country

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The Glacier Peak was a copper mine located on Miner's Ridge near the head of the Suiattle River. It is notable for the extensive exploration work that was done there. It worked a stockwork porphyry copper-molybdenum system consisting of three major deposits, the Main, the Northeast, and the Eastern Area. While the grade and tonnage were high, there was never any significant production due to permitting issues. The proposed development of this mine was one of the main reasons for the formation of the Glacier Peak wilderness area. Developments include 6 adits 100'-150' long, with one 450' long, and 34685' of drill holes.
Structure: Major East-Northeast Trending Shear Zone Northwest Projection Of Entiat Fault

Alteration: Potassic, Phyllic, Propylitic

Tectonics: Cascade Volcanic Arc

Commodity: Geochemical signature includes strong anomalies for ag, as, bi, cu, mo, pb, and w, moderate anomalies for au, in, k, rb, ti, and zn, and negative anomalies for al, ca, na, ni, and sr.

Deposit: Dimensions are of main ore body. There are two other ore bodies. Entire mineralized zone is 10,000 x 2000 x 1200 ft. System is accompanied by breccia pipes mrds records us53008, w002695, w017895 have been merged with this record and deleted

Deposit type: Porphyry Cu-Mo

Development: 56,472 ft of diamond drilling in 78 drill holes

Geology: Derkey and others (1990, p. 347) The Cloudy Pass batholith granodiorite was sheared and then intruded by a quartz diorite plug aproximately 400 ft south of the gneiss contact. Fracturing, stockwork systems, and veining developed in the quartz diorite and adjacent granodiorite. Mineralization flooded the fracture systems; the majority of the ore is in quartz diorite; lesser amounts of ore are in granodiorite, and ore extends locally into the gneiss. Mineral zonation and alteration are consistent with porphyry copper-type models. Derkey and others (1990, p. 347) The deposits occur on the northwest projection of the Entiat fault that was intruded by the Cloudy Pass Pluton. A post-Cloudy Pass quartz diorite plug and associated mineralization were emplaced into a major shear zone. This shear zone trends east to northeast and is located 400 ft south of the gneiss-Cloudy Pass granodiorite contact. The stockwork porphyry deposits are spatially related to fracturing intensity and east-west sheeted fissures.

Rock formation(s): Cloudy Pass Pluton;Totem Pass Migmatite;Cloudy Pass Pluton


Ore(s): Fracturing Intensity And East-West Sheeted Fissures

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

28 valid minerals.

Rock Types Recorded