Hobo

The Hobo is a lead, copper, gold, silver, and zinc mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Hobo
Secondary: Swede

Commodity

Primary: Lead
Primary: Copper
Primary: Gold
Primary: Silver
Primary: Zinc

Location

State: Alaska
District: Hyder

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Greenstone country rock is impregnated with sulfide minerals.

Rocks

Role: Host
Age Type: Host Rock
Age Young: Jurassic

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Galena
Ore: Pyrite
Ore: Pyrrhotite
Ore: Sphalerite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Deposit): Model Name = Polymetallic veins

Comment (Reference): Primary Reference = Buddington, 1929

Comment (Geology): Geologic Description = The country rocks in the area of this site are pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite; the Eocene Boundary Granodiorite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all of the other rocks (Smith, 1973, 1977; Koch, 1996).? the deposit (Buddington, 1929, p. 84-85) consists of mineralized (pyritized) greenstone containing veins or veinlike replacements of pyrite, pyrrhotite, and sphalerite, and smaller amounts of chalcopyrite, galena, and arsenopyrite. Early assays show some gold and silver, generally in small and variable amounts. Another vein in greenstone contains pyrite, pyrrhotite, and a little arsenopyrite in quartz gangue; these sulfides carry about 0.2-0.58 oz Au per ton. Nearby quartz veins in a fissure zone in greenstone carry pyrite, galena, and sphalerite.? Elliott and Koch (1981, loc. 71) describe the deposit as greenstone that contains mineralized zones with seams, fracture facings, and veins of the same sulfides described by Buddington. Their report also refers to quartz veins and disseminated sulfides; to quartz and calcite as the principal gangue minerals; and to a reported 9 oz of Au per ton in some samples.? Concentrated sulfide samples from a shear zone on the Hobo prospect yielded an Eocene lead-isotope age (Maas and others, 1995, p. 254). The deposit, however, is similar in mineralogy, structural setting, and hostrock to isotopically dated Jurassic deposits nearby in the Hyder district (see, for example, BC065, BC067). The lode thus may be polygenetic, originating as a 'disseminated' deposit during Jurassic (Hazelton) island-arc volcanism (Alldrick, 1993), and then partly remobilized into shear zones during emplacement of the Boundary Granodiorite.

Comment (Geology): Age = Host rock is similar to isotopically dated Jurassic deposits nearby.

Comment (Deposit): Other Comments = the Hobo group was originally staked in 1919.? the Swede group (Buddington, 1925, p. 78) is probably the same as the Hobo group, but has also been referred to in descriptions of the Portland and Daly-Alaska properties (Cobb, 1978, p. 73).? Also see BC070.

Comment (Geology): Age = Concentrated sulfide samples from a shear zone on the Hobo prospect yielded an Eocene lead-isotope age (Maas and others, 1995, p. 254). The deposit, however, is similar in mineralogy, structural setting, and hostrock to isotopically dated Jurassic deposits nearby in the Hyder district (see, for example, BC065, BC067). The lode thus may be polygenetic, originating as a 'disseminated' deposit during Jurassic (Hazelton) island-arc volcanism (Alldrick, 1993), and then partly remobilized into shear zones during emplacement of the Boundary Granodiorite.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Property explored by open cuts, probably mainly in the 1920's.? Early assays of sulfide samples show 0.2-0.58 oz Au per ton. Some samples reported to carry as much as 9 oz Au per ton.

References

Reference (Deposit): Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Reference (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.

Reference (Deposit): Alldrick, D.J., 1993, Geology and metallogeny of the Stewart mining camp, northwestern British Columbia: British Columbia Department of Mines and Petroleum Resources Bulletin 85, 105 p., 2 plates.

Reference (Deposit): Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-922, 98 p.

Reference (Deposit): Buddington, A.F., 1925, Mineral investigations in southeastern Alasaka: U.S. Geological Survey Bulletin 773, p. 71-139.

Reference (Deposit): Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.

Reference (Deposit): Smith, J.G., 1973, A Tertiary lamprophyre dike province in southeastern Alaska: Canadian Journal of Earth Sciences, v. 10, p. 408-420.

Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

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