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Cascade Creek

Occurrence in Alaska, United States with commodities Gold, Copper, Arsenic
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10000897
MRDS ID A011551
Record type Site
Current site name Cascade Creek

Geographic coordinates

Geographic coordinates: -152.09587, 62.47341 (WGS84)
Relative position Reed and others (1978, locality 21) locate this occurrence on Cascade Creek, a tributary to East Fork of the Yentna River, in the southeast quarter of Section 32, T. 28 N, R. 15 W., of the Seward Meridian within Denali National Park and Preserve. Also locality 77 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Talkeetna B-5(quadrangle 1:63,360 scale)

Talkeetna SW(quadrangle 1:100,000 scale)

Talkeetna(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Yentna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Arsenic Critical Secondary

Materials information

Materials Type of material
Gold Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -152.09587, 62.47341
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Reed and others (1978) describe visible gold in pan-concentrate samples from stream gravels at this site. This placer occurrence was apparently unreported prior to MacKevett and Holloway (1977). Curtin, Karlson, Tripp, and Day (1978) show heavy-metal concentrate values in streams draining this area, two of which had an excess of 3000 ppm copper, 50 ppm gold, 100 ppm silver. The country rocks are Mesozoic marine sedimentary rocks (KJs) that are intruded by the Late Cretaceous/early Tertiary Cascade (64.6 m.y.) pluton, one of the composite plutons (Tcp) described by Reed and Nelson (1980). Foley and others (1997) report mean values of 20 ppb gold, 1 ppb palladium, 42 ppb platinum, 139 ppm nickel, and 26 ppm copper from six rock samples of the Cascade pluton. The source of the metal in stream silt and pan concentrate samples at this site is probably related to the Cascade pluton.? Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from many of the composite plutons in the southern Alaska Range (Curtin, Karlson, Tripp, and Day, 1978; Curtin, Karlson, Tripp, Day, Cooley, and McDougal, 1978; Reed and others, 1978; Nelson and others 1992). Gold and platinum group element placers have been worked at several sites downstream from these bodies (Mertie, 1919; Cobb, 1973).? Also see TL020, TL023, TL052, and TL053.
  • Age = Pleistocene.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yentna

Comments on the workings information

  • Workings / Exploration = Reconnaissance mapping, prospecting, stream silt, pan concentrate, and rock sampling by the U.S. Geological Survey (Curtin, Karlson, Tripp, and Day, 1978; Reed and Nelson, 1980) are all that have been published on this site. Reed and others (1978) describe visible gold in pan-concentrate samples from stream gravels at this site. Curtin, Karlson, Tripp, and Day (1978) show heavy-metal concentrate values in streams draining this area, two of which had an excess of 3000 ppm copper, 50 ppm gold, 100 ppm silver. Foley and others (1997) report mean values of 20 ppb gold, 1 ppb palladium, 42 ppb platinum, 139 ppm nickel, and 26 ppm copper from six rock samples of the Cascade pluton. The source of the metal in stream silt and pan concentrate samples at this site is probably related to the Cascade pluton. Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from many of the composite plutons in the southern Alaska Range (Curtin, Karlson, Tripp, and Day, 1978; Curtin, Karlson, Tripp, Day, Cooley, and McDougal, 1978; Reed and others, 1978; Nelson and others 1992). Gold and platinum group element placers have been worked at several sites downstream from these bodies (Mertie, 1919; Cobb, 1973).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Cobb and Reed, 1980

General comments

Subject category Comment text
Deposit Model Name = Placer Au-PGE (Cox and Singer, 1986; model 39a).
Deposit Other Comments = This area is within Denali National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-AUG-1998 Madelyn A. Millholland Millholland & Associates

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.