Casadepaga River

Past Producer in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10308276
Record type Site
Current site name Casadepaga River

Geographic coordinates

Geographic coordinates: -164.35029, 64.79431 (WGS84)
Relative position The Casadepaga River is a major west tributary to the Niukluk River. This locality is at the old town of Casadepaga, where Sainsbury and others (1972, OFR 511) show placer tailings to be present. This is about 1.7 miles downstream from locality 81 of Cobb (1972, MF 445; 1978, OF 78-181).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Garnet Gangue
Magnetite Gangue

Mineral occurrence model information

Model code 119
USGS model code 39a
BC deposit profile C01. C02
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -164.35029, 64.79431

Comments on the geologic information

  • Geologic Description = The Casadepaga River is a major west tributary to the Niukluk River. The first 11 miles upstream from the mouth varies from 170 to 270 feet in elevation. The next 8 to 9 miles upstream gains another 150 feet of elevation. The lower 11 miles of the river has a pronouced floodplain over most of its length but in general this river is incised into benches and terraces that have surfaces 30 to 150 feet higher than the present drainage. Gold colors are commonly present in the bench gravels and mining has commonly taken place where tributaries cross the benches and rework these gravels (Collier and others, 1908). Heavy mineral concentrates from various parts of the drainage commonly contain garnet and magnetite. In general, bedrock was not exposed by early mining operations along the lower part of this river. As noted by Smith (1910), the depth to bedrock is known to vary from as much as 57 feet at the mouth of Penelope Creek (SO079) to 17 feet a half mile above the mouth of Big Four Creek (SO066). This location, at an elevation of about 325 feet, is the farthest upstream for which mining is known to have occurred on the river. Sainsbury and others (1972) show placer tailings along about 0.3 miles of the river channel at this location.
  • Age = Quaternary; the numerous incised terraces along the Casadepaga River and its major tributaries indicate that more than one cycle of erosion and deposition has developed placer deposits in the area. The low elevations between 170 and 270 feet along the first 11 miles of the river, suggest that Quaternary sea level fluctuations could have influenced placer development.

Economic information

Economic information about the deposit and operations

Development status Past Producer

Comments on exploration

  • Status = Probably inactive

Mining district

District name Council

Comments on the workings information

  • Workings / Exploration = Sainsbury and others (1972, OFR 511) show placer tailings along about 0.3 miles of the river channel at this location.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SO098

Bibliographic references

  • Deposit

    Cobb, E.H., 1972, Metallic resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, scale 1:250,000.

  • Deposit

    Sainsbury, C.L., Hudson, T.L., Ewing, R., and Marsh, W.R., 1972, Reconnaissance geologic maps of the Solomon D-5 and C-5 quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 511, 12 p., 2 sheets, scale 1:63,360.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.

Comments on the references

  • Primary Reference = Sainsbury and others, 1972

General comments

Subject category Comment text
Deposit Model Name = Placer Au-PGE (Cox and Singer, 1986; model 39a).

Reporter information

Type Date Name Affiliation Comment
Reporter 19-AUG-99 Travis L. Hudson Applied Geology