Ibex

The Ibex is a silver, zinc, and lead 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: Ibex

Commodity

Primary: Silver
Primary: Zinc
Primary: Lead

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: The quartzite hostrock may reflect silicification of pelitic country rock.

Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Early Jurassic

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Early Jurassic

Analytical Data

Not available

Materials

Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Ore: Tetrahedrite
Ore: Chalcopyrite
Gangue: Quartz

Comments

Comment (Reference): Primary Reference = Buddington, 1929

Comment (Workings): Workings / Exploration = A crosscut driven 131 feet to undercut the vein described by Buddington in 1925 did not find the vein and was abandoned (Buddington, 1926, p. 53-54).

Comment (Deposit): Model Name = Polymetallic veins

Comment (Geology): Age = Lead-isotope studies of galena from the Ibex prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Comment (Geology): Geologic Description = The country rocks in the area of the Ibex prospect are Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996).? the deposit consists of quartz fissure veins in granodiorite and overlying argillite and quartzite within 200 feet of the contact between the Texas Creek and its Hazelton roof. Buddington (1925, p. 88-89) describes a pinch-and-swell vein 15 inches to 2 feet thick of quartz and sulfides in argillite and quartzite cut by granite porphyry and granodiorite. The sulfides are mainly interbanded sphalerite and galena; pyrite, chalcopyrite, and tetrahedrite are also present. Assays of picked specimens reportedly showed high values of Ag, Cu, and Pb. ? Buddington (1926, p. 53-54) also describes a second lode, discovered in 1924. It is 5 inches to 3 feet thick and was traced in outcrop for several hundred feet. This lode consists of galena- and pyrite-bearing quartz stringers in a fissure zone in granodiorite.? Lead-isotope studies of galena from the Ibex prospect (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = the Ibex prospect was originally staked in 1923.

References

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): 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): 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): Buddington, A.F., 1926, Mineral investigations in southeastern Alaska: U.S. Geological Survey Bulletin 783, p. 41-62.

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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