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Ahua

Occurrence in Alaska, United States with commodities Copper, Silver, 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. 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 10307260
Record type Site
Current site name Ahua

Geographic coordinates

Geographic coordinates: -161.73365, 67.72945 (WGS84)
Relative position The Ahua prospect is at an elevation of about 1,000 feet near a south-flowing creek that drains the Kilyaktalik Peaks. It is in section 24, T. 27 N., R. 14 W., of the Kateel River Meridian. Schmidt and Allegro (1988), location 47 and field stations 84RB103 and 84JS030.

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Baird Mountains C-6(quadrangle 1:63,360 scale)

Baird Mountains N(quadrangle 1:100,000 scale)

Baird Mountains(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Noatak River(hydrologic unit)

Noatak River-Lisburne Peninsula(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Noatak National Preserve(National Preserve)

National Preserve NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Lead Secondary

Materials information

Materials Type of material
Marcasite Ore
Pyrite Ore

Alteration

  • (Local) Sulfide-bearing black shale is stained and bleached.

Mineral occurrence model information

Model code 208
USGS model code 31a
Deposit model name Sedimentary exhalative Zn-Pb
Mark3 model number 13

Nearby scientific data

(1) -161.73365, 67.72945
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Ahua occurrence consists of stained and bleached zones in black shale containing lenses of massive, botryoidal pyrite-marcasite. Samples of the sulfides contain as much as 60 ppm As, 2 ppm Ag, 100 ppm Zn, 5 ppm Ag, 700 ppm Ba, 20 ppm Co, 200 ppm Cu, 20% Fe, 30 ppm Mo, 100 ppm Ni and 50 ppm Pb. Pyrite-rich samples contain as much as 200 ppm Cu, 50 ppm Pb, 30 ppm Mo, 100 ppm Ni, 100 ppm Zn, 5 ppm Ag, 60 ppm As, 700 ppm Ba, and 20 ppm Co (Schmidt and Allegro, 1988). The host rocks are Lower Mississippian black shale that are similar to the Kuna Formation (Karl and others, 1985).
  • Age = Early Mississippian.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Noatak

Comments on the workings information

  • Workings / Exploration = The occurrence has been visited and sampled by the U.S. Geological Survey (Schmidt and Allegro, 1988).

Reference information

Bibliographic references

  • Deposit

    Schmidt, J.M., and Allegro, G.L., 1988, Map showing mineral occurrences and indicators in the Baird Mountains quadrangle, northwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1992, 1 sheet, scale 1:250,000.

  • Deposit

    Zayatz, M.R., Thompson, W.B., Bailey, E.A., Sutley, S.J., Folger, P.F., Karl, S.M., and Schmidt, J.M., 1988, Analytical results and sample locality maps of mineralized and unmineralized rock samples from the Baird Mountains quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-256-A, 159 p., 2 plates, scale 1:250,000.

  • Deposit

    Karl, S.M., Schmidt, J.M., and Folger, P.F., 1985, Selected anomalous rock and sediment samples from central and northwestern Baird Mountains quadrangle, in Bartsch-Winkler, S., ed., The United States Geological Survey in Alaska--Accomplishments during 1984: U.S. Geological Survey Circular 967, p. 8-13.

Comments on the references

  • Primary Reference = Schmidt and Allegro, 1988

General comments

Subject category Comment text
Deposit Model Name = Sedimentary exhalative Zn-Pb (Cox and Singer, 1986; model 31a).

Reporter information

Type Date Name Affiliation Comment
Reporter 29-DEC-99 Williams, Anita 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.