Upper Daly-Alaska

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

Geologic information

Identification information

Deposit ID 10000264
MRDS ID A010306
Record type Site
Current site name Upper Daly-Alaska
Alternate or previous names Hoosier, Bertha, Western

Geographic coordinates

Geographic coordinates: -130.03925, 56.02894 (WGS84)
Relative position The upper Daly-Alaska mine is in Section 25 at an elevation of about 1250-1800 feet on Daly Creek (Elliott and Koch, 1981, p. 17, loc. 66).? Also see lower Daly-Alaska mine (BC065), 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

Materials information

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

Alteration

  • (Local) Mineralized greenstone country rock is silicified and partly replaced by calcite and disseminated pyrite.

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 Host
    Stratigraphic age (youngest) Jurassic

Nearby scientific data

(1) -130.03925, 56.02894

Comments on the geologic information

  • 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; the Triassic Texas Creek Granodiorite, which 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 upper Daly-Alaska mine (Elliott and Koch, 1981, loc. 66) is in fractured zones in silicified greenstone, tuff, and quartz porphyry. The zones contain disseminated pyrite, calcite veinlets, quartz gash veinlets, and bands and patches of relatively massive sulfide minerals. Sphalerite, galena, and pyrite are reported, along with lesser amounts of tetrahedrite, chalcopyrite, pyrrhotite and arsenopyrite. Selected samples of the sulfides probably contain silver and some gold.? Concentrated sulfide samples from a shear zone at the upper Daly-Alaska mine site yielded an Eocene lead-isotope age (Maas and others, 1995, p. 254, 259). 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, 067). 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.
  • Age = Concentrated sulfide samples from a shear zone at the upper Daly-Alaska mine site yielded an Eocene lead-isotope age (Maas and others, 1995, p. 254, 259). 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, 067). The lode thus may be polygenetic, originating as a 'disseminated' deposit during Jurassic (Hazelton) island-arc volcanism (Alldrick, 1993), and then partly remobilized or reconstituted into shear zones during emplacement of the Boundary Granodiorite.
  • Age = Host rock is similar to isotopically dated Jurassic deposits nearby.

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 = A little ore was probably mined, but there is no public record of the amount of production.

Comments on the workings information

  • Workings / Exploration = Deposit was explored by open cuts and more than 100 feet of underground workings, 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 A010306
USGS Alaska Resource Data File ARDF BC066

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 claims on this property 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 upper and lower workings. Elliott and Koch (1981, locs. 65, 66), however, describe the upper and lower workings separately, and their descriptions are used in this report (also see lower Daly-Alaska mine, BC065).? In early reports, the name New Alaska Mining Company apparently applied in general to the Daly-Alaska property.

Reporter information

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