Inaccessible Ridge

Occurrence in Alaska, United States with commodities Barium-Barite, Copper

Geologic information

Identification information

Deposit ID 10003144
MRDS ID A015677
Record type Site
Current site name Inaccessible Ridge

Geographic coordinates

Geographic coordinates: -161.85377, 68.46947 (WGS84)
Relative position Location plotted is Inaccessible Ridge locality of Churkin and others (1978, fig. 3); on continuation of Inaccessible Ridge on southwest side of westernmost fork at head of Kagvik Creek and about 0.5 mi (0.8 km) northeast of hill 3770; within 2 mi (3.2 km).
(click for info)

Geographic areas

Country State
United States Alaska


Commodity Importance
Barium-Barite Primary
Copper Primary

Materials information

Materials Type of material
Barite Ore
Malachite Ore


  • (Local) Iron and copper staining

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
    Stratigraphic age (youngest) Late Triassic

Nearby scientific data

(1) -161.85377, 68.46947

Comments on the geologic information

  • Geologic Description = Malachite stains on fractures and marcasite nodules in tightly folded Triassic chert; yellow clay partings in chert near contact between intensely folded and faulted Lisburne Group and Siksikpuk Formation.
  • Age = Mississippian (barite)

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both metallic and non-metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Noatak

Comments on the workings information

  • Workings / Exploration = Contains 700 to more than 5000 ppm Ba (Churkin and others, 1978, p.20, 30-31).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015677
USGS Alaska Resource Data File ARDF MU005

Bibliographic references

  • Deposit

    Churkin, M. Jr., Mayfield, C.F., Theobald, P.K., Barton, H., Nodleberg, W.J., Winkler, G.R., and Huie, C., 1978, Geological and geochemical appraisal of metallic mineral resources, southern National Petroleum Reserve in Alaska: U.S. Geological Survey Open-File Report 78-70A, 82 p.

  • 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.

Comments on the references

  • Primary Reference = Churkin and others (1978)

General comments

Subject category Comment text
Deposit Model Name = Lode; stratiform

Reporter information

Type Date Name Affiliation Comment
Reporter 22-OCT-1992 M.T. Powers U.S. Geological Survey
Reporter 22-OCT-1992 D.F. Huber U.S. Geological Survey
Reporter 22-OCT-1992 J.M. Schmidt U.S. Geological Survey