Penelope Creek

Past Producer in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10001835
MRDS ID A012649
Record type Site
Current site name Penelope Creek
Related records 10233197

Geographic coordinates

Geographic coordinates: -164.25829, 64.86238 (WGS84)
Relative position Penelope Creek is a south tributary to the Casadepaga River. Its mouth is at an elevation of about 250 feet, about 4 miles upstream of the mouth of Big Four Creek. This is locality 63 of Cobb (1972, MF 445; 1978, OF 78-181).
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Geographic areas

Country State
United States Alaska


Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

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

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel

Nearby scientific data

(1) -164.25829, 64.86238

Comments on the geologic information

  • Geologic Description = Penelope Creek was primarily placer mined along its lower part where it crosses terraces of the Casadepaga River. However, about a mile above its mouth, an exploration shaft went through 97 feet of unconsolidated materials before reaching bedrock (Smith, 1910). This shaft encountered 40 feet of well-rounded creek gravels with some gold colors, 24 feet of yellowish clay, and 29 feet of washed gravel, some colluvium, and bottomed on clay on bedrock. Bedrock is exposed along the creek about 1/4 mile further upstream. A shaft along the Casadepaga River at the mouth of Penelope Creek encountered 57 feet of unconsolidated materials over bedrock; from the surface down these consisted of fine quartz sand, fine gravel, 20 feet of blue clay, 20 feet of sand and gravel, and clay on decomposed mica schist. The mining on Penelope Creek, along the active channel where it crosses the Casadepaga River terraces, did not reach bedrock. Pans along this part of the creek were reported to carry 5 cents in gold (Brooks and others, 1901). Bedrock in the area is part of a lower Paleozoic metasedimentary assemblage (Till and others, 1986).
  • Age = Quaternary; the numerous incised terraces along the Casadepaga River 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
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Council

Comments on the workings information

  • Workings / Exploration = At least three exploration shafts were dug in the area, including one along the Casadepaga River at the mouth of Penelope Creek. Small-scale placer mining took place locally along the lower part of the creek.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012649
USGS Alaska Resource Data File ARDF SO079

Bibliographic references

  • Deposit

    Brooks, A.H., Richardson, G. B., and Collier, A. J., 1901, Reconnaissance in the Cape Nome and Norton Bay regions, Alaska, in 1900: U.S. Geological Survey Special Publication, p. 1-180.

  • Deposit

    Smith, P.S., 1910, Geology and mineral resources of the Solomon and Casadepaga quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 433, 234 p.

  • 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

    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.

  • Deposit

    Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

Comments on the references

  • Primary Reference = Smith, 1910

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