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Ptarmigan Creek

Prospect in Alaska, United States with commodity Gold
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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. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10003611
MRDS ID A106369
Record type Site
Current site name Ptarmigan Creek

Geographic coordinates

Geographic coordinates: -154.7027, 60.59942 (WGS84)
Relative position The location appears to include the whole of Ptarmigan Creek. Individual prospects not delineated. Location plotted as approximate midpoint of Ptarmigan Creek. Location could extend up to 13 km both upstream and downstream.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark C-5(quadrangle 1:63,360 scale)

Lake Clark NW(quadrangle 1:100,000 scale)

Lake Clark C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mulchatna River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) Not applicable

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) -154.7027, 60.59942
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Brooks (1913) reported encouraging placer gold results from benches along Ptarmingan Creek. Ptarmigan Creek drains a diverse group of rocks: sedimentary rocks (unit KJs), volcanic rocks (unit Tv), plutonic rocks (unit TKi6), and the Chilikadrotna Greenstone. The Chilikadrotna Greenstone is a Late Silurian unit of weakly metamorphosed basalt, andesite, chert, limestone, and tuffaceous sedimentary rocks. Fossils from a limestone lens in the Chilikadrotna Greenstone suggest an early Late Silurian age (Bundtzen and others, 1979). Nelson and others (1983) described the unit KJs as interbedded lithic graywacke, silty sandstone, black shale , and local conglomerate. Irregular quartz segregations and veinlets are locally present. Small diorite bodies (unit TKi6) intrude these sedimentary rocks. One diorite pluton yielded a potassium-argon age on hornblende of 69.4 +/- 2.1 m.y. (Eakins and others, 1978) Adjacent to some of the larger igneous bodies are narrow contact aureoles of pelitic hornfels. Unit Tv includes: rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
  • Age = The placer gold is Quaternary, the source of gold could come from a variety of rocks with diverse ages.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Unknown

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Brooks, 1913

General comments

Subject category Comment text
Deposit Model Name = Placer Au (Cox and Singer, 1986; model 39a)
Deposit Other Comments = Cobb (1976) indicates that the location of the creek is not given, and because no other mention of the creek occurs, the report is suspect.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 D.P. Bickerstaff U.S. Geological Survey

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.