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Bearpaw Mountain

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

Geologic information

Identification information

Deposit ID 10307703
Record type Site
Current site name Bearpaw Mountain

Geographic coordinates

Geographic coordinates: -151.05595, 64.08658 (WGS84)
Relative position The Bearpaw Mountain prospects are found within a 2-square-mile area, low on the west flank of Bearpaw Mountain. The approximate center of the prospect area is in SW1/4SE1/4 section 34, T. 9 S., R. 18 W., of the Fairbanks Meridian. The Kantishna River is approximately 2 miles to the south, and there is an airstrip at Lake Minchumina approximately 35 miles southwest of the prospects. The Bearpaw Mountain prospects are located on land selected by or conveyed to Doyon, Limited.

Site location context

Political divisions (FIPS codes)

Denali(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Kantishna River A-3(quadrangle 1:63,360 scale)

Kantishna River SE(quadrangle 1:100,000 scale)

Kantishna River C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tin Critical Primary

Materials information

Materials Type of material
Quartz Gangue

Nearby scientific data

(1) -151.05595, 64.08658
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Bearpaw Mountain is composed of a two-mica granite stock (Doyon, Limited, 1998) intruding hornfelsed shale, schist, and siltstone (Bond, 1985). The shale, schist, and siltstone are of Ordovician to Silurian age, and the granite is Cretaceous to Tertiary (Chapman and Yeend, 1981). The granite outcrops on the west flank of Bearpaw Mountain cover approximately 2 square miles. The granite is coarse grained, vuggy, and cut in many places by numerous tourmaline-bearing aplite dikes. The granite is interpreted to be similar to tin granites in the Seward Peninsula (Bond, 1985). Regionally, the area contains a system of northeast-trending strike-slip and related conjugate faults, associated with Cretaceous to Tertiary plutonic rocks and coeval or younger volcanic rocks (Clautice and others, 1993). The prospects consist of vein and stockwork quartz in hornfels adjacent to the granite. As much as 1 percent limonitic voids and rare, blue-gray sulfide wisps are found in the quartz. Limited sampling identified quartz veins with as much as 15 ppm Sn (Bond, 1985). Limited outcrop suggests detrital tin placers and other tin bearing zones may be found with the granite (Bond, 1985). A regional stream sediment sampling and mapping program in 1975-77 and 1980 identified geochemical anomalies (Bond, 1985). In 1981, an airborne radiometric survey was conducted. In 1985, exploration consisted of mapping and collecting 12 rock chip samples (Bond, 1985). There are no indications of production.
  • Age = Veins are syn- or post-Cretaceous to Tertiary intrusion.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Kantishna

Comments on the production information

  • Production Notes = There are no indications of production.

Comments on the workings information

  • Workings / Exploration = A regional stream sediment sampling and mapping program in 1975-77 and 1980 identified geochemical anomalies (Bond, 1985). In 1981, an airborne radiometric survey was conducted. In 1985, exploration consisted of mapping and collecting 12 rock chip samples (Bond, 1985).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Bond, 1985

General comments

Subject category Comment text
Deposit Model Name = Plutonic-related mesothermal veining.
Deposit Other Comments = the Bearpaw Mountain prospects are located on land selected by or conveyed to Doyon, Limited. For more information, contact Doyon, Limited.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-NOV-99 Cameron S. Rombach Alaska Division of Geological and Geophysical Surveys

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.