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  3. Mineral Resource Data System (MRDS)

Twin Hills Prospect

Occurrence in Alaska, United States with commodities Gold, Silver, Copper, Zinc, Lead
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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. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10000642
MRDS ID A011258
Record type Site
Current site name Twin Hills Prospect
Related records 10112773

Geographic coordinates

Geographic coordinates: -150.49453, 63.33013 (WGS84)
Location accuracy 2000(meters)

Site location context

Political divisions (FIPS codes)

Denali(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Denali B-1(quadrangle 1:63,360 scale)

Denali SE(quadrangle 1:100,000 scale)

Mount McKinley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Denali National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Zinc Critical Secondary
Lead Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Silver Ore
Hornblende Gangue
Magnetite Gangue
Pyrrhotite Gangue

Analytical data

Result ASSAY OF $4.00 PER TON IN GOLD IN 1933, USGS BULL 836, P. 323

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -150.49453, 63.33013
ListMap

Economic information

Ore body information

  • General form VEINS, BRECCIA FILLINGS
    Thickness 3.05M

Comments on the geologic information

  • WIDESPREAD MINERALIZATION OF FRACTURED PALEOZOIC METAMORPHIC TERRANE INTRUDED BY TERTIARY GRANITIC INTRUSIVES. BANDED LIMESTONE; INDETERMINATE CLARK FINE GRAINED METAMORPHIC.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Kantishna

Land status

Ownership category National Park

Reference information

Bibliographic references

  • Deposit

    USGS BULL 836, P. 323

  • Deposit

    USGS OFR 77-169 A, P. 46 LOC. 44

  • Other Database

    BAG-MF-366-35

General comments

Subject category Comment text
Deposit VEINS AND FRACTURE FILLINGS IN BRECCIATED COUNTRY ROCK NEAR PLUTONS; GOLD AND SILVER ASSAYED FROM GRANITE PORPHYRY ALONG A FAULT
Deposit SEE ALSO: MT. EIELSON ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-84 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Editor 13-APR-94 Mosier, Dan 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.