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  3. Mineral Resource Data System (MRDS)

Myghapowit Mountain

Prospect in Alaska, United States with commodities Gold, Silver, Lead
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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 10003571
MRDS ID A106329
Record type Site
Current site name Myghapowit Mountain

Geographic coordinates

Geographic coordinates: -169.59316, 63.21916 (WGS84)
Relative position This site is a local upland on the east side of Myahapowit Mountain between the headwaters of the Seknak and Maknek Rivers (east central St. Lawrence Island). It is a conspicuous orange-weathering area over 1 mile across. It was not included by Cobb (1972; 1980).

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Saint Lawrence B-2(quadrangle 1:63,360 scale)

Saint Lawrence SE(quadrangle 1:100,000 scale)

Saint Lawrence(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

St. Lawrence Island(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Secondary

Materials information

Materials Type of material
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) The stock is altered to an assemblage of sericite, chlorite, clay minerals, and secondary silica. Only traces of the original textures are preserved in most places but breccia textures characterize several samples from the area (Patton and Csejtey, 1971, Table 1). The altered rocks are highly oxidized and well developed limonite staining and veining makes the stock conspicuously visible from a distance due to its red and orange color.

Nearby scientific data

(1) -169.59316, 63.21916
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The 2 square mile, highly altered quatrz latite and latite stock is intruded along the east side of the Myghapowit pluton in east central St. Lawrence Island (Patton and Csejtey, 1971; Patton and Csejtey, 1980). About 1 mile of the northwest contact is with Mississippian limestone (Patton and Csejtey, 1971, Figure 3). The stock is altered to an assemblage of sericite, chlorite, clay minerals, and secondary silica. Only traces of the original textures are preserved in most places but breccia textures characterize several samples from the area (Patton and Csejtey, 1971, Table 1). The altered rocks are highly oxidized and well developed limonite staining and veining makes the stock conspicuously visible from a distance due to its red and orange color. Pyrite is the only sulfide mineral that has been identified in hand specimens. Fifteen grab samples of rocks and soils from the altered stock have low to moderately anomalous contents of several metals but most importantly show that gold is present in this mineralized system. All of the samples had detectable gold although only three were at levels at or above the 0.02 ppm dectection limit (0.2, 0.3. and 0.6 ppm, Patton and Csejtey, 1971, Table 1). One of these samples contained 3,000 ppm arsenic and 300 ppm antimony. In the fifteen samples, lead ranges from 30 to 3,000 ppm, copper from 5 to 150 ppm, molydenum from less than 5 to 700 ppm, bismuth from less than 10 to 300 ppm, tin from less than 10 to 150 ppm, and silver from less than 0.5 to 1 ppm. Three stream sediment samples, each from the upper part of a drainage headed against the altered stock, contain 150 ppm lead and 10 to 20 ppm molybdenum (Patton and Csejtey, 1972). Other elements were not anomalous in these stream sediment samples.
  • Age = Patton and Csejtey (1980) indicate that the altered stock is Cretaceous or Tertiary. There is no age control other than that it appears to intrude the Myghapowit pluton (mid-Cretaceous) and Mississippian limestone (Patton and Csejetey, 1980).

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bering Sea

Comments on the workings information

  • Workings / Exploration = Fifteen grab samples of rocks and soils from the altered stock have low to moderately anomalous contents of several metals but most importantly show that gold is present in this mineralized system. All of the samples had detectable gold although only three were at levels at or above the 0.02 ppm dectection limit (0.2, 0.3. and 0.6 ppm, Patton and Csejtey, 1971, Table 1). One of these samples contained 3,000 ppm arsenic and 300 ppm antimony. In the fifteen samples, lead ranges from 30 to 3,000 ppm, copper from 5 to 150 ppm, molydenum from less than 5 to 700 ppm, bismuth from less than 10 to 300 ppm, tin from less than 10 to 150 ppm, and silver from less than 0.5 to 1 ppm. Three stream sediment samples, each from the upper part of a drainage headed against the altered stock, contain 150 ppm lead and 10 to 20 ppm molybdenum (Patton and Csejtey, 1972). Other elements were not anomalous in these stream sediment samples.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Patton and Csejtey, 1971 (OFR 71-224)

General comments

Subject category Comment text
Deposit Model Name = Gold in altered, hypabyssal, felsic intrusive rocks.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-SEP-1998 Travis L. Hudson Applied Geology

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.