Jago River

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003109
MRDS ID A015641
Record type Site
Current site name Jago River

Geographic coordinates

Geographic coordinates: -143.60338, 69.27989 (WGS84)
Relative position Accurate to within 1,525 meters (5,000 ft). Brosge' and Reiser, 1976, Locality 38 and Grybeck, 1977, p. 42, Locality 7.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Azurite Ore
Malachite Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels

Nearby scientific data

(1) -143.60338, 69.27989

Comments on the geologic information

  • Geologic Description = Malachite and azurite are present in calcareous hornfels adjacent to the Jago stock. The host rock is Cambrian sandstone near contact with the granite.??An isolated stock of granite of Early Devonian age intrudes the Neroukpuk Schist of Leffingwell (1919) near the headwaters of the Jago River; although not so indicated on the geologic map of Reiser and others (1980), this probably the is Jago stock as described here. The same map unit, the Neroukpuk Schist of Leffingwell (1919) was examined along the U.S.-Canada border where it consists of arkosic sandstone in which labile clasts including most of the potassium feldspar grains have been altered to white micas, quartz, other minerals (Kelley and others, 1995). This same unit likely is Cambrian in age along the border (Lane and othes, 1995) rather than Precambrian as indicated by Reiser and others (1980) (Lane and others, 1995).
  • Age = Probably Early Devonian

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Canning

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015641
USGS Alaska Resource Data File ARDF DP004

Bibliographic references

  • Deposit

    Cobb, E.H., Mayfield, C.F., and Brosg?, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

  • Deposit

    Brosge', W.P., and Reiser, H.N., 1976, Preliminary geologic and mineral resource maps (excluding petroleum), Arctic National Wildlife Range, Alaska: U.S. Geological Survey Open-File Report 76-539, 4 sheets, scale 1:500,000.

  • Deposit

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Kelley, J.S., Wrucke, C.T., and Lane, L.S., 1995, Stratigraphy of pre-Mississippian rocks in the Clarence River area, northeastern Alaska and northwestern Yukon Territory [abs]: Geological Society of America, 1995 Abstracts with Programs, Cordilleran Section Meeting, Fairbanks, Alaska, May 24-26, 1995, p. 57.

  • Deposit

    Reiser, H.N., Brosge', W.P., Dutro, J.T., Jr., and Detterman, R.L., 1980, Geological map of the Demarcation Point quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1133, scale 1:250,000.

  • Deposit

    Cobb, E.H., Mayfield, C.F., and Brosge, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

General comments

Subject category Comment text
Deposit Model Name = Lode; disseminated, possibly skarn

Reporter information

Type Date Name Affiliation Comment
Reporter 13-SEP-1996 Powers, M.T. U.S. Geological Survey
Reporter 13-SEP-1996 Huber, D.F. U.S. Geological Survey
Reporter 13-SEP-1996 Kelley, J.S. U.S. Geological Survey