Riverside

The Riverside is a silver, zinc, tungsten, lead, gold, and copper 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: Riverside
Secondary: Riverview
Secondary: Lindeborg

Commodity

Primary: Silver
Primary: Zinc
Primary: Tungsten
Primary: Lead
Primary: Gold
Primary: Copper
Secondary: Barium-Barite

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: Past Producer
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

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Tetrahedrite
Ore: Sphalerite
Ore: Scheelite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena
Gangue: Ankerite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Polymetallic veins

Comment (Geology): Geologic Description = The country rocks in the area of the Riverside mine are the Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; the Eocene Hyder Quartz Monzonite, which intrudes the Texas Creek and Hazelton rocks; and still-younger Tertiary lamprophyre dikes, which cut all the other rocks (Smith, 1973, 1977; Koch, 1996). The deposit (Chapin, 1916, p. 97; Westgate, 1922, p. 139; Buddington, 1925, p. 74-75, 79-82; 1929, p. 43, 77-81; Thorne and others, 1948, p. 4-5; Byers and Sainsbury, 1956, p. 125-136; Noel, 1966, p. 53-55; Cobb, 1978, p. 66-69) consists of two or three main quartz fissure veins up to 7 feet thick in Texas Creek Granodiorite, and the Lindeborg deposit, which is either a mineralized shear zone in a Hazelton schist inclusion in the granodiorite (according to most workers), or a mineralized zone of mylonitic gneiss and ultramylonite derived from the granodiorite (according to Smith, 1977, p. 17-18). The Lindeborg deposit contains considerable scheelite; the quartz veins carry only small amounts. Other than scheelite, the principal ore minerals are galena, pyrite, tetrahedrite, pyrrhotite, chalcopyrite, sphalerite, and native gold. The principal gangue mineral is quartz, accompanied by small amounts of calcite, ankerite, and barite. In the Texas Creek Granodiorite, the scheelite-bearing lodes (Byers and Sainsbury, 1956, p. 125-136) are mineralized shoots in quartz fissure veins. In the Lindeborg shear zone, they are in part quartz fissure veins and in part replacement deposits. Scheelite in the Lindeborg zone appears to have preferentially replaced calcareous laminae in the schist hostrock. The Lindeborg lode is about 3 feet thick and has been traced in outcrop for 2000 feet and through a vertical interval of more than 700 feet. Lead-isotope studies of galena from the Riverside mine (Maas and others, 1995, p. 254) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Comment (Geology): Age = Lead-isotope studies of galena from the Riverside mine (Maas and others, 1995, p. 254) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.

Comment (Production): Production Notes = From 1925-1951, the Riverside mine yielded about 30,000 tons of ore. Almost all of the ore was from the Lindeborg lode, which produced about 3,000 oz Au, 100,000 oz Ag, 100,000 lb Cu, 250,000 lb Pb, 20,000 lb Zn, and 70,000 lb WO3.

Comment (Reference): Primary Reference = Byers and Sainsbury, 1956; Cobb, 1978 (OFR 78-922)

Comment (Workings): Workings / Exploration = The Riverside mine operated discontinuously from 1925-1951. It was developed by more than 6000 feet of underground workings and explored by about 4600 feet of diamond drill holes, mainly during World War II.

Comment (Deposit): Other Comments = Deposit probably originally staked about 1915-1920. Some descriptions of the Riverside mine refer to it as the Riverview or Lindeborg property (Cobb, 1978, p. 66).

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Thorne, R.L., Muir, N.M., Erickson, A.W., Thomas, B. I., Hedie, H. E., and Wright, W. S., 1948, Tungsten deposits of Alaska: U.S. Bureau of Mines Report of Investigation 4174, 51 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): 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): Noel, G.A., 1966, The productive mineral deposits of southeastern Alaska: Alaska Division of Mines and Minerals, Report for the year 1966, p. 51-57, 60-68.

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): Byers, F.M., and Sainsbury, C.L., 1956, Tungsten deposits of the Hyder district, Alaska: U.S. Geological Survey Bulletin 1024-F, p. 123-140.

Reference (Deposit): Thorne, R.L., Muir, N.M., Erickson, A.W., Thomas, B. I., Hedie, H. E., and Wright, W. S., 1948, Tungsten deposits of Alaska: U.S. Bureau of Mines Report of Investigation 4174, 22 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.

Reference (Deposit): Chapin, Theodore, 1916, Mining developments in southeastern Alaska: U.S. Geological Survey Bulletin 642, p. 73-104.

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.

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