Orange Hill Prospect

Occurrence in Alaska, United States with commodities Copper, Molybdenum, Gold, Silver

Geologic information

Identification information

Deposit ID 10000513
MRDS ID A010707
Record type Site
Current site name Orange Hill Prospect
Alternate or previous names Lemon, Alaska Nabesna Corp.

Geographic coordinates

Geographic coordinates: -142.84143, 62.20386 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • 4 MILES WEST OF BOND CREEK DEPOSIT. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary
Gold Secondary
Silver Secondary

Comments on the commodity information

  • CU, ZN, AG, & AU REPORTED ON NEARBY LEMON CLAIMS IN CONTACT METAMORPHIC DEPOSIT

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Molybdenite Ore
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Central Altered Zone (About 400x2000m) Contains Abuntant Biotite, Quartz Veinlets, Minor K-Feldspar, Chlorite, And Sericite. Outer Altered Zones (About 100x3000m) Contain Chlorite, Minor Sericite And Anhydrite.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Nabesna Pluton;Nabesna Pluton
    Rock description Nabesna Pluton;Nabesna Pluton
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Nabesna Pluton
    Rock description Nabesna Pluton

Nearby scientific data

(1) -142.84143, 62.20386

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Large
Significant No
Discovery year <1903

Mining district

District name Chisana District

Reserves and resources

  • Type In-situ
    Estimate year 1975
    Total resources 145,000mt ore
    Remarks Entry carried over from Old MRDS or added later (i.e. it did not originate in ARDF)
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.35 wt-pct Copper Major 1975

Comments on the reserve resource information

  • USGS MF-655K ALSO REPORTS SOME EARLIER RESOURCE ESTIMATES FOR ORANGE HILL DEPOSIT

Comments on the workings information

  • SURFACE WORK & SHORT ADITS FOR EXPLORATION PURPOSES.

Comments on development

  • EXTENSIVE EXPLORATION BY SURFACE EXCAVATIONS, SHORT ADITS, AND DIAMOND DRILLING.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010707

Bibliographic references

  • Deposit

    USGS OFR 80-927, P. 49-50

  • Deposit

    USGS MF-655K

General comments

Subject category Comment text
Deposit PYRITE, CHALCOPYRITE, AND MINOR MOLYBDENITE IN QUARTZ VEINLETS AND AS DISSEMINATIONS IN DIORITE. TWO PRINCIPAL ALTERNATION ZONES RECOGNIZED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1984 Elliott, R. L. U.S. Geological Survey
Editor 13-APR-1994 Mosier, Dan U.S. Geological Survey