Stoner

Site Name

Primary: Stoner
Secondary: Stoner Gold and Silver Mining Corporation

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Commodity

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

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Location

State: Alaska
District: Hyder

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Polymetallic veins

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Greenstone is impregnated with sulfide minerals; local silicification of greenstone

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Rocks

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

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Analytical Data

Not available

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Materials

Ore: Galena
Ore: Pyrite
Ore: Pyrrhotite
Ore: Sphalerite
Ore: Tetrahedrite
Gangue: Calcite
Gangue: Quartz

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Comments

Comment (Exploration): Status = Inactive

Comment (Deposit): Model Name = Polymetallic veins

Comment (Deposit): Other Comments = Deposit originally staked in early 1920's

Comment (Geology): Geologic Description = The country rocks in the area of this prospect are pelitic metasedimentary and subordinate andesitic metavolcanic (greenstone) strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; the Eocene Boundary Granodiorite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith 1973, 1977; Koch, 1996).? There are three types of deposits on the property (Westgate, 1922, p. 131-132; Buddington, 1925, p. 74, 83; 1929, p. 43, 89-90; Cobb, 1978, p. 76): (1) sulfides in quartz-calcite veins and disseminated sulfides in greenstone; (2) sparse sulfides in quartz fissure veins in or near contacts between slate and granitic dikes; and (3) sulfides in seams, disseminations, and along fractures in quartz porphyry dikes. The sulfides are pyrite, sphalerite, galena, tetrahedrite, and pyrrhotite. In addition to sulfide replacement, some of the greenstone also is silicified. Early assays reportedly showed as much as 0.5 oz Au and 20.5 oz Ag per ton, and 28% Pb.? 'Concentrated' sulfide samples from a shear zone on the Stoner 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 (Geology): Age = 'Concentrated' sulfide samples from a shear zone on the Stoner 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 (Workings): Workings / Exploration = Prospect was explored in 1920's by open cuts and a 15-foot shaft.? As much as 0.5 oz Au and 20.5 oz Ag per ton, and 28% Pb reported in early assays.

Comment (Reference): Primary Reference = Buddington, 1929

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References

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): 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): 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): 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): 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.

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): Westgate, L.G., 1922, Ore deposits of the Salmon River district, Portland Canal region: U.S. Geological Survey Bulletin 722, p. 117-140.

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

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.

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