Dugas; Stampede; Blasher Extension Prospect, Hyder Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Dugas; Stampede; Blasher Extension Prospect	Prospect
Hyder Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

This prospect, identified in 1972 (Berg and others, 1977, p. 77, 79-80) by three small pits, was called Dugas by Buddington (1929, p. 99) and Stampede by Berg and others (1977, p. 38-39, 77, 79). The Dugas/Stampede prospect area was originally staked in 1925 and restaked several times since then. In 1958 it was covered by the Alaska State Mines Extension group of claims. None of these claims was active in 1973. The name Blasher Extension has also been associated with this prospect area. Site appears to be just within Misty Fiords National Monument.
Location: The prospect is in Section 16 at an elevation of about 4100 feet, about 1.8 mile north-northwest of Texas Lake (Elliott and Koch, 1981, p. 12, loc. 31; Berg and others, 1977, plate 2). The location probably is accurate to within about a quarter of a mile.
Geology: The country rocks in the area of this prospect are pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group. The Hazelton is underlain and locally intruded by the Triassic Texas Creek Granodiorite, and both the Hazelton and Texas Creek are intruded by the Eocene Hyder Quartz Monzonite (Smith, 1977; Berg, 1977, p. 15-18, 22-23; Koch, 1996). Buddington (1929, p. 99) describes three types of deposits, hosted in graywacke and slate: (1) quartz fissure veins in a shattered zone cutting across bedding; (2) mineralized quartz stringers in shear zones parallel to bedding; and (3) stringers of sulfide minerals parallel to bedding. The sulfide minerals are sphalerite, galena, pyrite, and chalcopyrite. Fracture surfaces in an aplite are faced with some of the sulfides. Berg and others (1977, p. 38-39, 77, 79-80) describe the strongly iron-stained deposit as a shear zone up to two feet wide in graywacke and argillite that contains small amounts of galena, sphalerite, and chalcopyrite. They also describe a mineralized aplite dike and a two-foot-thick quartz vein that contains small to trace amounts of the same[?] sulfide minerals and malachite. A single composite sample from three channel samples assayed 300 ppm Cu, 250 ppm Pb, 200 ppm Zn, and 10 ppm Ag. The highest precious-metal assays from 5 samples were 0.05 ppm Au and 30 ppm Ag.
Workings: The only workings identified in 1973 (Berg and others, 1977) were three small pits or trenches. A single composite from three channel samples assayed 300 ppm Cu, 250 ppm Pb, 200 ppm Zn, and 10 ppm Ag. The highest precious-metal assays from 5 samples were 0.05 ppm Au and 30 ppm Ag.
Alteration: Local intense iron staining. Minor oxidation of chalcopyrite to malachite.

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins

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Link to USGS - Alaska:	BC031

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References