Hot Air

Past Producer in Alaska, United States with commodities Antimony, Gold

Geologic information

Identification information

Deposit ID 10001566
MRDS ID A012315
Record type Site
Current site name Hot Air
Alternate or previous names Hot Air No. 1
Related records 10210168

Geographic coordinates

Geographic coordinates: -131.98485, 55.5178 (WGS84)
Relative position The approximate location of this mine is at an elevation of about 200 feet, about 1.4 miles north-northwest of Caamano Point. The site is in section 26, T. 73 S., R. 88 E., of the Copper River Meridian. It corresponds to loc. 40 in Elliott and others (1978). The location is accurate within about 0.2 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Antimony Primary
Gold Secondary

Materials information

Materials Type of material
Kermesite Ore
Pyrite Ore
Realgar Ore
Stibnite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) The country rocks are silicified and dolomitized.

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble

Nearby scientific data

(1) -131.98485, 55.5178

Comments on the geologic information

  • Geologic Description = The country rocks near this site are Silurian or Ordovician andesitic and basaltic tuff and agglomerate, and minor interbedded graywacke, argillite, and limestone (Brew, 1996, p. 27, 29). The strata were regionally metamorphosed to greenschist-grade phylliteand semischist in Late Cretaceous time. Their early Paleozoic premetamorphic age assignment is based on a Silurian or Ordovician Pb-U (zircon) isotopic age of a dike that intrudes the bedded rocks. ? the deposit consists of stibnite-bearing fissure veins and irregular replacement masses of stibnite in brecciated and partly dolomitized and silicified limestone (Sainsbury, 1957, p. 163-178; Cobb and Elliott, 1980, p. 23; Maas and others, 1995, p. 277). The limestone is interbedded with gray, calcareous slate and phyllite. The contact between the limestone and phyllite country rocks strikes NW and dips about 30 NE. At the prospect, the country rocks are intricately veined with quartz and calcite stringers, and contain abundant disseminated pyrite. The largest stibnite vein is 3.5 feet thick and about 90 feet long, and consists almost entirely of massive stibnite of radiating acicular and platy crystal habits. The crystals show evidence of mild deformation. Small amounts of realgar and kermesite also are reported at the prospect. A small, highly altered dike that crops out east of the main antimony deposit, contains pyrite, and, reportedly, a little gold.? the veins and associated alteration postdate the Late Cretaceous penetrative metamorphic fabric of the hostrocks. The relatively mild deformation of the stibnite is undated, but it probably postdates, or occurred during a late phase of, the Upper Cretaceous regional metamorphism.
  • Age = Late Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = Samples across about 3 feet of the main vein contained 25.67-48.86% Sb, and a shipment of 956 kg of hand-sorted rock from the trenches assayed 44.8% Sb, 12.6% S, 0.5% As, and 14.8% insolubles (Maas and others, 1995, p. 277).

Comments on the workings information

  • Workings / Exploration = The deposit was discovered in 1914. Exploration before 1952 included a 15-foot shaft, a 44-foot shaft, drifts totalling 100 feet, and several trenches (Sainsbury, 1957). Maas and others (1995, p. 277) report a third shaft, of unknown length. Samples across about 3 feet of the main vein contained 25.67-48.86% Sb, and a shipment of 956 kg of hand-sorted rock from the trenches assayed 44.8% Sb, 12.6% S, 0.5% As, and 14.8% insolubles (Maas and others, 1995, p. 277). Samples of disseminated stibnite ore collected by the U.S. Geological Survey contained up to 10,000 ppm Sb (Sainsbury, 1957, p. 173).? A sample of pyrite-rich quartz- and carbonate-veined phyllite and marble collected in 1975 by the U.S. Geological Survey on the coast about 1 mile north-northeast of Caamano Point contained up to 7.5 ppm Au, 2 ppm Ag, 1000 ppm Sb, and more than 1% As (Elliott and others, 1978, loc. 40; Koch and Elliott, 1978, USGS sample 75BG125 [OFR 78-156A]).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012315
USGS Alaska Resource Data File ARDF KC040

Bibliographic references

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    Koch, R.D., and Elliott, R.L., 1978, Analyses of rock samples from Ketchikan quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 78-156-A, 162 p., 1 sheet, scale l:250,000.

  • Deposit

    Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.

  • Deposit

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

  • Deposit

    Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000.

  • Deposit

    Sainsbury, C.L., 1957, A geochemical exploration for antimony in southeastern Alaska: U.S. Geological Survey Bulletin 1024-H, p. 163-178.

Comments on the references

  • Primary Reference = Sainsbury, 1957

General comments

Subject category Comment text
Deposit Model Name = Simple antimony deposit (Cox and Singer, 1986; model 27d)
Deposit Other Comments = Soil sampling in the area of this site revealed small stibnite deposits beneath muskeg swamp (Sainsbury, 1957).

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUN-99 H.C. Berg U.S. Geological Survey