Headwall

Prospect in Alaska, United States with commodities Gold, Antimony, Tin, Copper, Lead

Geologic information

Identification information

Deposit ID 10308200
Record type Site
Current site name Headwall

Geographic coordinates

Geographic coordinates: -159.11388, 61.65735 (WGS84)
Relative position This prospect is in the Russian Mountains on the northeast flank of the sharp ridge between the headwaters of Cobalt and Mission Creeks. The map site is in the SW1/4 sec. 8, T. 18 N., R. 54 W., of the Seward Meridian. It is at an elevation of about 2,350 feet, about 0.15 mile south-southwest of a small cirque-basin lake. It is sample locality 14 of Bundtzen and Laird (1991).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Primary
Tin Primary
Copper Secondary
Lead Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Bindheimite Ore
Bismuth Ore
Chalcopyrite Ore
Galena Ore
Pekoite Ore
Scorodite Ore
Quartz Gangue
Sericite Gangue
Tourmaline Gangue

Alteration

  • (Local) Silicification and tourmalinization.

Nearby scientific data

(1) -159.11388, 61.65735

Comments on the geologic information

  • Geologic Description = The Headwall prospect is in syenite and includes several 10-foot wide banded tourmaline greisen zones that trend northwest for a distance of at least 790 feet (Bundtzen and Laird, 1991). The zones are exposed over a vertical range of 400 feet. The tourmaline greisens contain euhedral quartz, along with sericite and sulfide veinlets and clots. Arsenopyrite, native bismuth, pekoite, galena, bindheimite, and scorodite have been identified in the sulfide-rich assemblages (Bundtzen and Laird, 1991). The sulfide-bearing zones are disrupted by later faulting. Six channel samples average 3.3 ppm gold, 7.32 percent arsenic, 0.16 percent antimony, and 0.04 percent tin. Bismuth, copper, and lead analyses are not available. Assuming dimensions, in feet, of 4.45 x 400 x 790, Bundtzen and Laird (1991) estimated a resource of 82,900 tons of material with the stated average grades. The host rocks are part of the Upper Cretaceous intrusive complex of the Russian Mountains.
  • Age = Late Cretaceous or Tertiary. Greisens crosscut part of the intrusive complex of the Russian Mountains. Quartz monzonite from this complex has yielded a K/Ar age of 70.3 +/- 2.1 Ma (Bundtzen and Laird, 1991).

Economic information

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Aniak

Comments on the reserve resource information

  • Reserves = Assuming dimensions, in feet, of 4.45 x 400 x 790, Bundtzen and Laird (1991) estimate a resource of 82,900 tons of material with average grades of 3.3 ppm gold, 7.32 percent arsenic, 0.16 percent antimony, and 0.04 percent tin. Bismuth, copper, and lead analyses are not available.

Comments on the workings information

  • Workings / Exploration = Surface observation and sampling has been completed (Bundtzen and Laird, 1991).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF RM018

Bibliographic references

  • Deposit

    Bundzten, T.K., and Laird, G.M., 1991, Geology and mineral resources of the Russian Mission C-1 Quadrangle, southwest Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 109, 24 p.

Comments on the references

  • Primary Reference = Bundtzen and Laird, 1991

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-01 Travis L. Hudson Applied Geology
Reporter 10-JUN-01 Madelyn A. Millholland Millholland & Associates