Twin Hills Prospect

Occurrence in Alaska, United States with commodities Gold, Silver, Copper, Zinc, Lead

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)
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Zinc 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

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011258

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