Lower Daly-Alaska

Past Producer in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000263
MRDS ID A010305
Record type Site
Current site name Lower Daly-Alaska
Alternate or previous names Iron, Elevenmile

Geographic coordinates

Geographic coordinates: -130.04481, 56.03171 (WGS84)
Relative position The lower Daly-Alaska mine is in Section 25 at an elevation of about 400 feet on lower Daly Creek (Elliott and Koch, 1981, p. 16, loc. 65). The location is accurate within about 100 feet.? Also see upper Daly-Alaska mine (BC066), and Additional Comments field, below.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Comments on the commodity information

  • Ore Material = Silver (native)

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Freibergite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Tetrahedrite Ore
Silver Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Greenstone hostrock is pyritized and silicified.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -130.04481, 56.03171

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Daly-Alaska property are pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic 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).? the deposit at the lower Daly-Alaska mine (Elliott and Koch, 1981, loc. 65) is a shear or breccia zone in pyritized and silicified greenstone that contains quartz-calcite veinlets and sulfide stringers. The sulfides include mainly pyrrhotite, sphalerite, galena, pyrite, tetrahedrite, and chalcopyrite. Buddington (1929, p. 87-88) also reports small amounts of arsenopyrite, freibergite, and native silver at the lower Daly-Alaska site. High silver values and some gold were reported and some ore reportedly was shipped from the property, which was explored by open cuts and developed by a few hundred feet of underground workings from two or more portals.? Lead-isotope studies of galena from the lower Daly-Alaska mine (Maas and others, 1995, p. 254) indicate that the deposit is Jurassic in age, contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
  • Age = Lead-isotope studies of galena from the lower Daly-Alaska mine (Maas and others, 1995, p. 254) indicate that the deposit is Jurassic in age, contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the production information

  • Production Notes = An unknown amount of ore reportedly was shipped from the property, probably between 1915 and 1925.

Comments on the workings information

  • Workings / Exploration = Property was explored by open cuts and developed by a few hundred feet of underground workings from two or more portals, mainly between about 1915 and 1925.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010305
USGS Alaska Resource Data File ARDF BC065

Bibliographic references

  • Deposit

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

  • Deposit

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

  • Deposit

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

  • 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.

  • Deposit

    Buddington, A.F., and Chapin, Theodore, 1929, Geology and mineral deposits of southeastern Alaska: U.S. Geological Survey Bulletin 800, 398 p.

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Elliott and Koch, 1981

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = the first Daly-Alaska claims were located in 1912 and 1913.?Descriptions of the Daly-Alaska property in early reports (Chapin, 1916, p. 97; Westgate, 1922, p. 128, 131-133; Buddington, 1925, p. 74, 83-84; 1929, p. 43-44, 86-88; Buddington and Chapin, 1929, p. 318, 327, 357-358), which were summarized by Cobb (1978, p. 23-24), do not consistently distinguish between the lower and upper workings. Elliott and Koch (1981, locs. 65, 66), however, describe them separately, and their descriptions are used in this report.? An early name that apparently referred in general to the Daly-Alaska property was the New Alaska (Mining Company).? Also see upper Daly-Alaska mine (BC066).

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey