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Bosart Mine, Kantishna Mining District, Denali Borough, Alaska, USAi
Regional Level Types
Bosart MineMine
Kantishna Mining DistrictMining District
Denali BoroughBorough
AlaskaState
USACountry

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Latitude & Longitude (WGS84):
63° 34' 0'' North , 150° 53' 52'' West
Latitude & Longitude (decimal):
Locality type:
KΓΆppen climate type:


The Bosart mine is in Denal National Park and Preserve.
Location: The Bosart mine (Cobb, 1980 [OFR 80-363]) is at an elevation of about 2700 feet on the west wall of the west fork of Twentytwo Gulch. It is in the SW1/4 SW1/4 of section 32, T. 15 S., R. 17 W., Fairbanks Meridian. The location is accurate within 500 feet. The mine site corresponds to number 14 of Cobb (1972 [MF 366]), 36 of Bundtzen, Smith, and Tosdal (1976), 42 of Bundtzen (1981), 116 of Hawley and Associates (1978), and 48 of Thornsberry, McKee, and Salisbury (1984).
Geology: The country rocks at the Bosart mine are interlayered quartz-feldspar schist and micaceous quartz schist of the Precambrian Birch Creek Schist. Greenschist is also present locally and garnet amphibolite underlies a prominent ridge about 75 feet west of the mine workings (Bundtzen, 1981, pl. 3; Thornsberry, McKee, and Salisbury, 1984, v.2, occurrence 48). The deposit is a thin, sulfide-rich vein that strikes N. 50 E., and dips 70-80 NW. The vein contains arsenopyrite, pyrite, chalcopyrite, galena, sphalerite, tetrahedrite, and polybasite (Wells, 1933, p. 370-371; Bundtzen, 1981). The polybasite occurs mainly in high-grade, silver-lead ore. Some of the galena may be oxidized to cerussite. The sulfide-rich ore contains silver assaying from a few ounces to about 40 ounces per ton; some veins assayed more than 230 ounces of silver per ton. Twenty tons of hand-picked ore shipped in 1980 averaged 0.328 ounce of gold and 78.22 ounces of silver per ton; some ore contained more than 1000 ounces of silver per ton. The Bosart vein projects towards the Florence vein (MM082), which is about 0.75 mile to the southwest.
Workings: The vein was developed by Otto Bosart before 1931(Wells, 1933). It was prospected in the 1960s and 1970s by Arley Taylor and Jim Dale. In 1980, a small quantity of ore was mined and shipped. Mill ore was left in place.
Age: The deposit is assumed to be Eocene (see record MM091).
Alteration: Possible oxidation of lead mineral.
Production: The mine produced at least 20 tons of high-grade ore in 1980. This ore contained as much as 6.56 ounces of gold and 1564.4 ounces of silver per ton. About 75 tons of mill-grade ore was left in the walls of the high-grade vein, and a Harz-type jig plant was on the property in 1983. Probably no mining occurred after 1983 (Thornsberry, McKee, and Salisbury, 1984, v. 2).
Reserves: About 75 tons of low-to medium-grade gold-silver ore was not mined; exploration probably would develop more reserves at the property.

Commodities (Major) - Ag; (Minor) - Au, Cu, Pb, Sb, Zn
Development Status: Yes; small
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


9 valid minerals.

Detailed Mineral List:

β“˜ Arsenopyrite
Formula: FeAsS
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Cerussite
Formula: PbCO3
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Chalcopyrite
Formula: CuFeS2
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Galena
Formula: PbS
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Polybasite
Formula: [Cu6Sb2S7][Ag9CuS4]
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Pyrite
Formula: FeS2
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Quartz
Formula: SiO2
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Siderite
Formula: FeCO3
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ Sphalerite
Formula: ZnS
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.
β“˜ 'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S
Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Arsenopyrite2.EB.20FeAsS
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Galena2.CD.10PbS
β“˜Polybasite2.GB.15[Cu6Sb2S7][Ag9CuS4]
β“˜Pyrite2.EB.05aFeS2
β“˜Sphalerite2.CB.05aZnS
β“˜'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
Group 4 - Oxides and Hydroxides
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Cerussite5.AB.15PbCO3
β“˜Siderite5.AB.05FeCO3

List of minerals for each chemical element

CCarbon
Cβ“˜ CerussitePbCO3
Cβ“˜ SideriteFeCO3
OOxygen
Oβ“˜ CerussitePbCO3
Oβ“˜ QuartzSiO2
Oβ“˜ SideriteFeCO3
SiSilicon
Siβ“˜ QuartzSiO2
SSulfur
Sβ“˜ ArsenopyriteFeAsS
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ GalenaPbS
Sβ“˜ Polybasite[Cu6Sb2S7][Ag9CuS4]
Sβ“˜ PyriteFeS2
Sβ“˜ SphaleriteZnS
Sβ“˜ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
FeIron
Feβ“˜ ArsenopyriteFeAsS
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ PyriteFeS2
Feβ“˜ SideriteFeCO3
CuCopper
Cuβ“˜ ChalcopyriteCuFeS2
Cuβ“˜ Polybasite[Cu6Sb2S7][Ag9CuS4]
Cuβ“˜ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Znβ“˜ SphaleriteZnS
AsArsenic
Asβ“˜ ArsenopyriteFeAsS
AgSilver
Agβ“˜ Polybasite[Cu6Sb2S7][Ag9CuS4]
SbAntimony
Sbβ“˜ Polybasite[Cu6Sb2S7][Ag9CuS4]
Sbβ“˜ Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
PbLead
Pbβ“˜ CerussitePbCO3
Pbβ“˜ GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360.
Cobb, E. H., 1972, Metallic mineral resources map of the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Miscellaneous Field Studies Map MF-366, 1 sheet, scale 1:250,000.
Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
Wells, F. G., 1933, Lode deposits of Eureka and vicinity, Kantishna district, Alaska: U. S. Geological Survey Bulletin 849-F, p. 335-379.

Other Databases

Link to USGS - Alaska:MM074

Other Regions, Features and Areas containing this locality


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