Unnamed (on Raggedtop Mountain)

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

Geologic information

Identification information

Deposit ID 10001009
MRDS ID A011681
Record type Site
Current site name Unnamed (on Raggedtop Mountain)

Geographic coordinates

Geographic coordinates: -149.13262, 61.01954 (WGS84)
Relative position On northeastern flank of Raggedtop Mountain, 2,400 ft east-northeast of summit (peak 5,215). Accurate within 2,000 ft. This is the prospect location from plate 33 of Park (1933).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Primary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) The intrusive rocks have undergone argillic alteration. Oxidation of iron minerals.

Mineral occurrence model information

Model code 274
USGS model code 36a.1
Deposit model name Low-sulfide Au-quartz vein, Chugach-type
Mark3 model number 26

Nearby scientific data

(1) -149.13262, 61.01954

Comments on the geologic information

  • Geologic Description = According to Park (1933) a quartz vein, apparently shattered from postmineral movement, cuts Late Cretaceous metasedimentary rocks of the Valdez Group. The metasedimentary rocks are in close proximity to quartz diorite or dacite dikes, sills, irregular pipes, or plugs. The vein strikes N 50 W, dips 40 W, and ranges from 1-24 inches thick with about 7 inches being the average thickness. The vein contains galena, pyrite, and limonite. Numerous small mineralized stringers were seen on the steep mountain side south of this location. Samples taken indicate 0.01 oz/ton Au, 1.4 oz/ton Ag, and 1.12 percent Pb (Park, 1933). Other nearby small prospects have several small but well-mineralized quartz veins that cut both intrusive and metasedimentary rocks.
  • Age = Tertiary or younger; veins cut Late Cretaceous Valdez Group rocks and Teriary intrusive rocks.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Anchorage

Comments on the workings information

  • Workings / Exploration = Vein exposed in a 2 ft open cut. Samples taken indicate 0.01 oz/ton Au, 1.4 oz/ton Ag, and 1.12 percent Pb (Park, 1933).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011681
USGS Alaska Resource Data File ARDF AN106

Bibliographic references

  • Deposit

    Park, F.C., 1933, The Girdwood District, Alaska: U.S. Geological Survey Bulletin 849-G, p. 381-424.

  • Deposit

    Clark, S.H.B., and Yount, M.E., 1972, Reconnaissance geologic map and geochemical analyses of stream-sediment and rock samples of the Anchorage A-6 Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 351, 2 sheets, scale 1:63,360.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Comments on the references

  • Primary Reference = Park, 1933

General comments

Subject category Comment text
Deposit Model Name = Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1)

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey