Blasher

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

Geologic information

Identification information

Deposit ID 10000159
MRDS ID A010195
Record type Site
Current site name Blasher
Alternate or previous names Lone Star Group
Related records 10113025

Geographic coordinates

Geographic coordinates: -130.26676, 56.05588 (WGS84)
Relative position The Blasher prospect is in Section 16 at an elevation of about 2600 feet approximately 0.3 mile northwest of Texas Lake (Elliott and Koch, 1981, p. 12, loc. 32). The location is accurate to within about a quarter of a mile.? Also see Additional Comments field, below.
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Geographic areas

Country State
United States Alaska

Commodities

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

Materials information

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

Alteration

  • (Local) Hostrock identified as quartzite may have formed by silicification of pelitic country rock.

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 Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Hazelton Group;Hazelton Group;Texas Creek Granodiorite
    Rock description Hazelton Group;Hazelton Group;Texas Creek Granodiorite

Nearby scientific data

(1) -130.26676, 56.05588

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Blasher prospect include pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; and the Eocene Hyder Quartz Monzonite, which intrudes both the Hazelton and Texas Creek rocks (Smith, 1977; Berg and others, 1977, p. 15-18, 22-23; Koch, 1996).? Buddington (1929, p. 100) describes the deposit as a shattered and fissured zone in quartzite, less than 200 feet above the contact of the Texas Creek Granodiorite. The zone, traced along strike for about 1500 feet, contains a quartz vein about 4 feet thick and many mineralized quartz stringers. The veins carry galena, pyrite, sphalerite, and minor chalcopyrite. A short adit driven in argillite to undercut the lode encountered quartz veinlets containing disseminated molybdenite. ? Berg and others (1977, p. 38-39, 72, 85-89) describe the deposit as a quartz vein up to 2 feet thick and exposed along strike for about 140 feet . The hostrocks are Hazelton hornfels and quartz monzonite that is interpreted as a cupola of the Texas Creek Granodiorite. The vein contains erratically distributed chalcopyrite, galena, sphalerite, pyrrhotite, pyrite, and molybdenite. A weighted average of assay data over the exposed length of the vein gives 0.93% Cu, 1.15% Pb, 1.25% Zn, 0.002% Mo, and 4.4 oz Ag and 0.016 oz Au per ton. Small amounts of powellite are present locally in the vein, and the quartz monzonite and hornfels country rocks locally contain sparse molybdenite.? Lead-isotope studies of galena from the Blasher prospect (Maas and others, 1995, p. 244) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.?
  • Age = Lead-isotope studies of galena from the Blasher prospect (Maas and others, 1995, p. 244) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

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 = Property has been explored by a short drift, surface opencuts, trenches, and pits, and seven diamond drillholes.? A weighted average of assay data over the exposed length of the vein gives 0.93% Cu, 1.15% Pb, 1.25% Zn, 0.002% Mo, and 4.4 oz Ag and 0.016 oz Au per ton (Berg and others, 1977).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010195
USGS Alaska Resource Data File ARDF BC032

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

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

  • 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 = the Blasher prospect was originally staked in 1923, restaked several times, and covered in 1970-71 by the Lone Star group of 32 claims (Berg and others, 1977, p. 85).

Reporter information

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