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  3. Mineral Resource Data System (MRDS)

Lydell

Prospect in Alaska, United States with commodity 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. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10003468
MRDS ID A106226
Record type Site
Current site name Lydell

Geographic coordinates

Geographic coordinates: -149.31268, 61.76956 (WGS84)
Relative position On the southern flank of Skyscraper Mountain 3,200 ft south-southwest of VABM Pass. Accurate within 2,000 ft.

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-7(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Susitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Summit Lake State Recreation Site(State Recreation Area)

State Recreation Area ST(Type of land area)

ST(Federal land areas administered by ST)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Alteration

  • (Local) Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954).

Nearby scientific data

(1) -149.31268, 61.76956
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Quartz veins along the contact of Late Cretaceous quartz diorite and Jurassic (?) mica schist, smaller quartz veins are also present in the schist (Katz, 1911). The quartz diorite is part of the Late Cretaceous Willow Creek Pluton, a zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite. Wall-rock alteration within a few inches of the veins is intense, but seldom extends more than 10 to 12 inches beyond the quartz filling. Sericitization and carbonate alteration predominate, but there is some pyritization and in the outer parts of the alteration zone chloritization is present (Ray, 1954). The schist is a Jurassic (?) quartz-albite-chlorite (+/- garnet-biotite) pelitic schist.
  • Age = Late Cretaceous or younger; vein cuts the Late Cretaceous Willow Creek Pluton. Or Jurassic or younger if the veins cutting the schist are unrelated to the quartz vein along the contact.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the workings information

  • Workings / Exploration = Unknown amount of work completed, no important mineral values were found (Katz, 1911).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Katz, 1911

General comments

Subject category Comment text
Deposit Other Comments = Katz did not visit this prospect but obtained the information from 'reliable sources'.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff 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.