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Lillie

Prospect in Alaska, United States with commodities Copper, Molybdenum, Lead, Tungsten
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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. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308983
MRDS ID A010340
Record type Site
Current site name Lillie
Alternate or previous names Unnamed (south of Dry Pass)
Related records 10112583, 10234301, 10258400, 10161009, 10000294

Geographic coordinates

Geographic coordinates: -133.41586, 56.14973 (WGS84)
Relative position Prospects, occurrences, and claims in an area of several square miles on northern Kosciusko Island, south of Dry Pass. Coordinates are for the approximate center of activity. Locality 50 and 51 of Grybeck, Berg, and Karl (1984).

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg A-5(quadrangle 1:63,360 scale)

Petersburg S(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Prince of Wales(hydrologic unit)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Lead Primary
Tungsten Critical Primary

Comments on the commodity information

  • Gangue = Calcsilicate minerals

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Magnetite Ore
Molybdenite Ore
Powellite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Marble Gangue
Quartz Gangue

Alteration

  • Contact metamorphic/metasomatic alteration with development of calcsilicate minerals in marble at periphery of the pluton at Dry Pass.

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Nearby scientific data

(1) -133.41586, 56.14973
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Several mineral deposits occur near the contact of a Cretaceous quartz monzonite pluton bordered by Cretaceous marble metamorphosed from Silurian Heceta Limestone (Brew, and others, 1984); all the deposits are probably related to this contact zone. At the Lillie prospect (Denny, 1961; Herreid and Kaufman, 1964) a band of tactite about 100 feet wide in diorite contains joint coatings and disseminated irregular masses, less than a half-inch in diameter, of molybdenite and subordinate powellite, chalcopyrite, pyrite, and magnetite. At another unnamed occurrence, a band of magnetite about 3 feet wide follows the contact between a diorite dike and marble. At another, samples of hornfels, marble, and diorite collected from a dump outside a short caved adit contain variable amounts of magnetite, molybdenite, chalcopyrite, pyrrhotite, pyrite, and galena. Quartz veins near the adit contain scheelite and a 5-foot chip sample of the vein contained 1.4% WO3. Quartz-rich rock near a marble-diorite contact also carry disseminated scheelite. These and additional showings of molybdenite, pyrite, and chalcopyrite in the contact zone of the pluton suggest the possibility of a porphyry copper or molybdenum deposit as well as more contact metamorphic deposits in the vicinity. Also see 'Workings/exploration'.
  • Age = Cretaceous based on probable genetic relationship to nearby pluton.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = Old prospects and occurrences on which little recent work apparently has been done beyond minor surface exploration and a short adit (said to be 100 feet long). Twenty-seven lode claims were staked in the area in 1961 (U. S. Bureau of Mines, 1980) and an even bigger block is shown on the 1995 Alaska land status map. Extent and type of work done on these claims in recent years is unknown.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Herreid and Kaufman, 1964

General comments

Subject category Comment text
Deposit Model Name = Various types of skarn deposits (Cox and Singer, 1986; models 14a, 18a, 18b, 18c, and 18d).
Deposit Model Number = 14a, 18a, 18b, 18c, and 18d

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1998 H.C. Berg and D.J. Grybeck 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.