Bowser Creek-Headwaters

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

Geologic information

Identification information

Deposit ID 10307865
Record type Site
Current site name Bowser Creek-Headwaters

Geographic coordinates

Geographic coordinates: -153.72082, 62.19448 (WGS84)
Relative position The Bowser Creek-Headwaters prospect is located in the valley bottom of the headwaters of Bowser Creek; it extends for a distance of about 750 feet (230 meters) at an elevation of 4,400-to-4,500 feet (1,340 to 1,370 meters) in the NE1/4 sec. 5, T. 24 N., R. 24 W., of the Seward Meridian. Location is precisely known; reporter visited the site in 1982.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Zinc Primary
Arsenic Secondary
Gold Secondary
Cobalt Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue
Siderite Gangue

Alteration

  • (Local) Massive pyrrhotite is heavily oxidized to ferricrete gossan.

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
    Chronological age 60.4
    Dating method K-Ar
    Type of media quartz porphyry
    Stratigraphic age (youngest) Tertiary

Nearby scientific data

(1) -153.72082, 62.19448

Comments on the geologic information

  • Geologic Description = The Bowser Creek-Headwaters prospect consists of disseminated to massive, sulfide mineralization in discrete, northwest-trending, steeply dipping, quartz-carbonate veins and vein breccias cutting quartz porphyry of the Bowser Creek composite pluton. The quartz porphyry phase, which has been radiometrically dated a 60.4 Ma; it intrudes the Early to mid-Paleozoic Dillinger subterrane (Bundtzen and others, 1988; Bundtzen, Harris, and Gilbert, 1997). A prospect map has been published by Bundtzen and others (1988). Sulfide minerals include massive sphalerite and pyrrhotite, with lesser amounts of galena, chalcopyrite, and arsenopyrite. Pyrrhotite and arsenopyrite clearly crosscut previously deposited galena, sphalerite, and pyrite. Reed and Elliott (1968, C 559) reported scattered values of up to 4,820 grams/tonne silver, 0.08 grams/tonne gold, 3.00 percent arsenic, 3.00 percent copper, 200 ppm cobalt, 10.00 percent zinc, and 10.00 percent lead. The average of four chip samples taken by Bundtzen and others (1988) across the sulfide-bearing vein system was 35.7 grams/tonne silver, 0.29 percent copper, 0.14 percent lead, and 4.00 percent zinc, but no detectable gold. Other elevated metal concentrations include 469 ppm arsenic, 0.12 percent cadmium, and 169 ppm cobalt (Bundtzen and others, 1988).
  • Age = Inferred to be Tertiary, based on a K-Ar age of 60.4 Ma from host quartz porphyry intrusion.
  • Age = Chronological age is for the hosdt rock.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = No surface exploration excavations have been undertaken at the prospect. Reed and Elliott (1968, C 559) reported scattered values of up to 4,280 grams/tonne silver, 0.08 grams/tonne gold, 3.00 percent arsenic, 3.00 percent copper, 200 ppm cobalt, 10.00 percent zinc, and 10.00 percent lead. The average metallic content of four chip samples taken by Bundtzen and others (1988) across the sulfide-bearing veins was 37.5 grams/tonne silver, 0.29 percent copper, 0.14 percent lead, and 4.00 percent zinc. Other elevated metal concentrations include 469 ppm arsenic, 0.12 percent cadmium, and 169 ppm cobalt noted by Bundtzen and others (1988).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG066

Bibliographic references

  • Deposit

    Reed, B.L. and Elliott, R.L., 1968, Geochemical anomalies and metalliferous deposits between Windy Fork and Post River, southern Alaska: U.S. Geological Survey Circular 596, 22 pages.

  • Deposit

    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

  • Deposit

    Bundtzen, T.K., Kline, J.T., Smith, T.E., and Albanese, M.D., 1988, Geology of the McGrath A-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 91, 18 p., 1sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = Bundtzen and others, 1988

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).
Deposit Other Comments = Part of a larger mineral center related to the Bowser Creek composite pluton; see Bowser Creek-Main (MG068) and Bowser Creek-Northeast (MG067) prospects.

Reporter information

Type Date Name Affiliation Comment
Reporter 13-OCT-98 T.K. Bundtzen Pacific Rim Geological Consulting