Dugas

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000168
MRDS ID A010203
Record type Site
Current site name Dugas
Alternate or previous names Stampede, Blasher Extension
Related records 10161218

Geographic coordinates

Geographic coordinates: -130.27287, 56.06283 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Local intense iron staining. Minor oxidation of chalcopyrite to malachite.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Texas Creek Granodiorite
    Rock description Texas Creek Granodiorite
    Stratigraphic age (youngest) Early Jurassic
    Stratigraphic age (youngest) Early Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Hazelton Group;Hazelton Group
    Rock description Hazelton Group;Hazelton Group

Nearby scientific data

(1) -130.27287, 56.06283

Comments on the geologic information

  • Geologic Description = 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.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • Workings / Exploration = 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010203
USGS Alaska Resource Data File ARDF BC031

Bibliographic references

  • Deposit

    Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.

  • Deposit

    Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

  • Deposit

    Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords wilderness study area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.

  • Deposit

    Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

  • Deposit

    Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = 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.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey