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  3. Mineral Resource Data System (MRDS)

Dyckman

Occurrence in Alaska, United States with commodities Arsenic, Molybdenum, Zinc, Gold
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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. Reporter information

Geologic information

Identification information

Deposit ID 10307766
Record type Site
Current site name Dyckman

Geographic coordinates

Geographic coordinates: -153.20598, 63.83753 (WGS84)
Relative position This occurrence is located near the summit of Dyckman Mountain at an elevation of 1,870 feet (570 m) in Section 16, T. 19 S., R. 29 E., of the Kateel River Meridian. The site is accurately located to within 100 feet (30 m).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Medfra D-1(quadrangle 1:63,360 scale)

Denali NW(quadrangle 1:100,000 scale)

Medfra(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork Kuskokwim River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Arsenic Critical Primary
Molybdenum Primary
Zinc Critical Primary
Gold Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Sphalerite Ore
Hematite Gangue

Alteration

  • (Local) Intensive clay alteration of feldspars; chalcedonic replacements in rhyolitic breccias.

Nearby scientific data

(1) DSwc
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Dyckman occurrence consists of disseminated arsenopyrite in an intensively altered, rhyolite volcanic (?) breccia. Extensive clay alteration has completely altered all feldspar minerals. The alteration zone was traceable for nearly 500 feet (152 m) along strike. The width of the zone is unknown. The mineral occurrence is inferred to be Cretaceous, based on isotopic age of host rhyolite (Moll and others, 1981). Two grab samples contained 350 ppm zinc and 234 ppm arsenic (Clautice and others, 1993). One sample contained 9 ppb gold (Clautice and others, 1993). DiMarchi and others (1992) report values of 1,630 ppm molybdenum and 574 ppm arsenic from limonitically stained zones in rhyolitic breccia on Dyckman Mountain.
  • Age = Inferred to be Cretaceous, based on isotopic age of host rhyolite (Moll and others, 1981).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = Two grab samples contained 350 ppm zinc and 234 ppm arsenic (Clautice and others, 1993). One sample contained 9 ppb gold (Clautice and others, 1993). DiMarchi and others (1992) report values of 1,630 ppm molybdenum and 574 ppm arsenic from limonitically stained zones in rhyolitic breccia on Dyckman Mountain.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Clautice and others, 1993

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting

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.