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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Horn Mountain

Occurrence in Alaska, United States with commodity Zeolites
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10001010
MRDS ID A011682
Record type Site
Current site name Horn Mountain

Geographic coordinates

Geographic coordinates: -147.50266, 61.9796 (WGS84)
Relative position On southeast flank of Horn Mountain, 2,000 ft north of headwaters of Wood Creek. The occurrence extends along the flank, northeast of the point given. Accurate within 2,000 ft. Locality 71 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage D-2(quadrangle 1:63,360 scale)

Anchorage NE(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Matanuska(hydrologic unit)

Knik Arm(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Zeolites Primary

Materials information

Materials Type of material
Heulandite Ore
Laumontite Ore
Mordenite Ore

Alteration

  • (Local) Mordenite is an alteration product of volcanic sandstones and replacement of glassy shards of vitric tuffs (Hawkins, 1973).

Nearby scientific data

(1) Jtk
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Zeolite-bearing tuff beds formed by burial diagenesis and low-grade regional metamorphism of Early Jurassic tuffaceous rocks of the Talkeetna Formation. Zeolites are at least 30 meters thick extending for 14 kilometers and composed of 50 percent commercial grade mordenite. Heulandite occurs in thin, tabular crystals and laumontite is present in smaller amounts. Mordenite is an alteration product of volcanic sandstones and replacement of glassy shards of vitric tuffs (Hawkins, 1973). During the time of formation, the zeolite-bearing rock was subjected to a maximum temperature of 200 degrees Celsius and fluid pressures of 0.5 to 3 kilobars. This is equivalent to 1 to 10 kilometers burial depth (Hawkins, 1976).
  • Age = Early Jurassic or younger; the zeolited tuff beds are part of the Early Jurassic tuffaceous rocks of the Talkeetna Formation.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Non-metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the workings information

  • Workings / Exploration = Surface mapping and sampling.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Hawkins, 1976

General comments

Subject category Comment text
Deposit Model Name = Burial diagenesis and low-grade regional metamorphism of tuffaceous rocks (Hawkins, 1976).
Deposit Other Comments = Horn Mountains are probably the largest known high-grade mordenite deposit in North America.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.