Lost River Mine

Site Name

Primary: Lost River Mine
Secondary: Orebodies: Cassiterite Dike, Ida Bell Dike
Secondary: Claims: Bald Eagle, Carry Gow, Collier, Engineer, Green, Jenny Lynn,
Secondary: Jupiter, Klondike, Lincoln, Mars, Rob Roy, Shon Rue, Surveryor,
Secondary: Three Prospectors, Triangle.

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Commodity

Primary: Tin
Secondary: Tungsten
Tertiary: Molybdenum
Tertiary: Antimony
Tertiary: Bismuth
Tertiary: Fluorine-Fluorite
Tertiary: Beryllium
Tertiary: Lead
Tertiary: Zinc
Tertiary: Copper

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Location

State: Alaska

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Land Status

Not available

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Holdings

Not available

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Workings

Type: Surface/Underground

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1913
Year Last Production: 1955
Discovery Year: 1903
Years of Production:
Organization:
Significant: N

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Form: CONICAL

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Structure

Type: R
Description: S-Dipping Thrusts Cut By Major Normal Faults; Pre-Intrusive

Type: L
Description: 3 N-S Vertical Faults, 2 E-W Faults From Small Graben Over Granite Cupola

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Alterations

Alteration Type: L
Alteration Text: Hydrous And Chlorite-Carb. Retrograde Alt. Of Limestone; Greisenization, Sericitization And Kaolinization Of Igneous Rx.

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Rocks

Not available

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Analytical Data

Analytical Data: SAMPLES OF ORE FROM CASSITERITE DIKE AVERAGED 0.07% BEO, USBM OFR 1-65, P. 5-6.
Analytical Data: "REPRESENTATIVE" ORE FROM RHYOLITE PORPHYRY DIKES: 1.02% SN, 0.29% WO3, LIMESTONE: 0.12-0.13% BEO (AVG. OF 1243 FT OF DRILL CORE)
Analytical Data: USBM DATA: 18 SAMPLES CONTAINED FROM 0.22% SN-3.33% SN, (AVG. 1.16%), AND FROM 0.07% TO 2.23% TUNGSTATE (AVG. 0.58%(, AVG. WIDTH: 8.3 FT

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Materials

Ore: Bismuthinite
Ore: Beryl
Ore: Stannite
Ore: Wolframite
Ore: Euclase
Ore: Phenacite
Ore: Bertrandite
Ore: Galena
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Stibnite
Ore: Scheelite
Ore: Molybdenite
Ore: Cassiterite
Gangue: Garnet
Gangue: Pyrolusite
Gangue: Magnetite
Gangue: Ilmenite
Gangue: Hematite
Gangue: Epidote
Gangue: Diaspore
Gangue: Rutile
Gangue: Topaz
Gangue: Tourmaline
Gangue: Quartz
Gangue: Plagioclase
Gangue: Idocrase
Gangue: Sericite
Gangue: Kaolinite
Gangue: Pyrite
Gangue: Pyrrhotite
Unknown: Fluorite

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Comments

Comment (Production): MILL RECORDS SHOWED 51,000 ST OF ORE CONTAINING 1.13% SN PRODUCED 687 ST CONC. AVERAGING 52% SN; RECOVERY: 60.8%; SMELTER RETURNS SHOW MILL WEIGHT FIGURES TO BE HIGH, USBM IC 7871, P. 2.

Comment (Development): ACTIVE YEARS: 1903-1920, 1928-29, 1951-55; EXTENSIVELY EXPLORED AND DRILLED BY USBM IN 1942-44 AND 1951-52; MOST DEVELOPMENT IN 1951-55 WHEN MINED BY U.S. TIN CORP. WITH DPA FUNDING CONCURRENT WITH DMEA EXPLORATION PROJECT; 65,000 FT OF DD-HOLES COMPLETED AS OF 1972; ACTIVE EXPL. IN 1983.

Comment (Location): MAIN HAULAGE ADIT (NEW NO. 3 ADIT), USGS BULLETIN 1129, PLATES 1 AND 2. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Deposit): MINERALOGICALLY COMPLEX SN-W-F-BE DEPOSIT CONSISTING OF (1) CASSITERITE, WOLFRAMITE AND BASE-METAL SULFIDES DISSEMINATED ALONG GREISENIZED RHYOLITE PORPHYRY DIKES, (2) CASSITERITE AND WOLFRAMITE-BEARING QUARTZ-TOPAZ AND MICA-RICH GREISENS IN GRANITE CUPOLA, (3) STOCKWORKS OF SN-BEARING GARNET-IDOCRASE SKARNS, AND (4) BERYLLIUM MINERALIZATION HOSTED BY FLUORITE-MICA VEINS; NO VEINS EXTEND MORE THAN 300 M FROM STOCK CONTACT; MAIN ORE BODY: CASSITERITE DIKE, 5-20 FT (AVE. 12 FT), SN-BEARING OVER 2200 FT STRIKE LENGTH, VERTICAL RANGE OF 500 FT, STRIKE AND DIP LISTED ABOVE.

Comment (Workings): TOTAL-ALL OPRATORS: 1903-1955 (IN LINEAR FT) HAND DUG TRENCHES: 2085 FT, DOZER TRENCHES: 5900 FT; SURFACE DD-HOLES: 8899 FT (USBM); UNDERGROUND DD-HOLES: 1984 FT (DMEA); LONG HOLE PERCUSSION DRILLING: 1795 FT (DMEA); EXPLOR. DRIFTS AND CROSSCUTS: 4384 FT; RAISES: 275 FT; SHAFTS/WINZES: 820 FT; ALL STOPES ABOVE 300 FT ELEV.

Comment (Reserve-Resource): CAMP CR. AND OTHER NEARBY DEPOSITS PROBABLY INCLUDED IN ESTIMATES OF FLUORITE-BE ORE

Comment (Reserve-Resource): LINE 1 PROBABLY REFERS TO LOST RI. AREA AS A WHOLE, INCLUDING CAMP CR. F-BE AND OTHER NEARBY DEPOSITS

Comment (Geology): CUPOLA OF BIOTITE GRANITE AND OLDER RHYOLITIC QUARTZ PORPHYRY AND LAMPROPHYRE DIKES INTRUDED MASSIVE ORD. LIMESTONE; GRANITE EXPOSED IN UNDERGROUND WORKINGS [365 LEVEL]; CRUDELY CONICAL AREA OF MARMARIZED LIMESTONE ABOVE CUPOLA CUT BY GARNETIFEROUS SKARNS AND STOCKWORKS WITH VEIN DENSITY FROM 5% TO GREATER THAN 30%; GREISENS FORMED IN CUPOLA AND RHYOLITIE PORPHYRIES APPROX. CONTEMPORANEOUS WITH HYDROUS ALTERATION OF SKARNS AND STOCKWORKS IN LIMESTONE.

Comment (Deposit): DETAILED INFO ON ALTERATION AND MINERALOGY: ECON. GEOLOGY, V. 77, NO. 4, P. 1033-1052; MINE WORKINGS AND ASSAY MAPS: USGS BULLETIN 1129, USBM RI 3902; DD-HOLE DATA: USBM OFR 2-65, MINING/BENEFICIATION DATA: USBM IC 7871. ; INFO.SRC : 1 PUB LIT

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References

Reference (Production): USGS BULLETIN 1287, P. 62.

Reference (Reserve-Resource): USGS OFR 78-1-C, P. 13-14

Reference (Deposit): ECON. GEOL., V. 77, NO. 4, P. 1033-1052.

Reference (Deposit): GSA BULLETIN, V. 94, NO. 6, P. 769-770, 778.

Reference (Deposit): USGS OFR 77-796-B, P. 6, LOC. 37.

Reference (Deposit): USGS BULLETIN 1287, P. 45, 62-63, 74-75, 81-84, 93.

Reference (Deposit): USBM OFR 2-65.

Reference (Deposit): USBM OFR 1-65

Reference (Deposit): USGS BULLETIN 1129

Reference (Deposit): USBM IC-7871.

Reference (Deposit): USBM RI 3902.

Reference (Deposit): USGS BULLETIN 733, P. 51-74.

Reference (Other Database): BAG-MF-426-08

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