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M.G.L. Mines

Past Producer in Pershing county in Nevada, United States with commodities Tungsten, Molybdenum
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10042417
MRDS ID M060205
Record type Site
Current site name M.G.L. Mines
Alternate or previous names Buster, Cowles, Western Soldier, Wizard Group, Cameron Claims, NBMG Sample Sites 2896 and 2897
Related records 10247379

Geographic coordinates

Geographic coordinates: -119.26489, 40.03489 (WGS84)
Elevation 1554
Relative position IN COWLES CANYON, 5 MILES FROM WINNEMUCCA LAKE

Site location context

Political divisions (FIPS codes)

Pershing(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Tohakum Peak SE(quadrangle 1:24,000 scale)

Kumiva Peak(quadrangle 1:100,000 scale)

Lovelock(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Pyramid-Winnemucca Lakes(hydrologic unit)

Truckee(hydrologic accounting unit)

Central Lahontan(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management NV)

Bureau of Land Management NV BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Nevada Pershing

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 025N 024E 15 Nevada

Comments on the location information

  • ON WEST FLANK OF NIGHTINGALE RANGE

Commodities

Commodity Importance
Tungsten Critical Primary
Molybdenum Tertiary

Materials information

Materials Type of material
Molybdenite Ore
Scheelite Ore
Calcite Gangue
Chalcopyrite Gangue
Epidote Gangue
Garnet Gangue
Pyrite Gangue
Pyroxene Gangue
Pyrrhotite Gangue
Quartz Gangue

Alteration

  • (Local) Silication And Silicification

Analytical data

Result SAMPLE 2896, REDDISH-BROWN GARNET-SILICA ROCK TAKEN FROM THE OPEN STOPE AREA ON THE NORTH SIDE OF THE CANYON, CONT-AINS 3 % FE, 1.5 % MG, 15 % CA, 0.05 % TI, 5000 PPM MN, 500 PP-M B, 30 PPM BI, 5 PPM CO, 20 PPM CR, 10 PPM CU, 20 PPM LA, 5 P-PM NI, 15 PPM SN, 100 PPM SR, 100 PPM V, 150 PPM W, 10 PPM Y, -200 PPM ZN, 50 PPM ZR, (ALSO 0.05 PPM AU, BY AA ANALYSIS.) SAM-PLE 2897, CHIPPED FROM THE CONTACT ZONE ABOVE THE LARGE ADIT A-ND DUMP WITH SILICIC GARNET FROM A QUARTZITE WITH VISIBLE TUNG-STEN MINERALIZATION
Result IT CONTAINS 3 % FE, 1 % MG, 15 % CA, 0.1 -% TI, 5000 PPM MN, 0.5 PPM AG, 10 PPM B, 15 PPM BI, 5 PPM CO, -50 PPM CR, 30 PPM CU, 30 PPM LA, 5 PPM NI, 20 PPM PB, 5 PPM SC-,20 PPM SN, 150 PPM V, 150 PPM W, 15 PPM Y, 50 PPM ZR.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock
    Rock unit name Auld Lang Syne Group
    Rock description Auld Lang Syne Group

Nearby scientific data

(1) -119.26489, 40.03489
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Post Mineral Faults

Ore body information

  • Strike NW
    Dip SE
    Length 228.6M
    Width 91.44M

Controls for ore emplacement

  • Igneous Contact

Comments on the geologic information

  • AREAS OF SCHIST AND SLATE ARE INVADED BY GRANODIORITE TONGUES PARALLEL TO BEDDING. LIMESTONE (MARBLE AND HORNFELS) ARE CUT INTO IRREGULAR-SHAPED BLOCKS BY GRANODIORITE DIKES. SCHEELITE SEEN IS PURE WHITE AND LESS THAN A 1/4 INCH THICK. DEPOSITS CARRY CONSIDERABLE GARNET IN CONTRAST TO DEPOSITS ON EASTERN SLOPE OF NIGHTINGALE RANGE. W DEPOSITS IN TACTITES AT LIMESTONE/GRANODIORITE CONTACT. SCHEELITE CONCENTRATION VARY IN ALTERNATING LAYERS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1917
Year of first production 1918

Mining district

District name Nightingale District

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner
    Owner Mgl Mining Co.
    First year 1956

Comments on the production information

  • W AS WO3; BY 1956

Workings at the site

  • Type of workings Unknown
    Length 1005.84M

Comments on the workings information

  • SEVERAL LARGE ADITS NORTH OF THE CANYON AND OPEN STOPE. MILL SITE AT THE MOUTH OF THE CANYON; RAISES, DRIFTS

Comments on development

  • SMALL AMOUNT OF ORE PRODUCED IN 1917-18. FROM 1942-45 THE MINE WAS OPERATED BY THE M.G.L. MINING CORP WHICH BUILT A 100-TON FLOTATION CONCENTRATOR. THE MINE WAS REOPENED DURING 1952-56 AND WORKED BY VARIOUS LESSEES. IT HAS BEEN IDLE SINCE 1956.FIRST PRODUCTION IN 1918 BY C. R. COWLES AND ASSOCIATES, WHO MINED ABOUT 80 TONS THAT AVERAGED 1.28 % WO3. THE PRO-PERTY WAS ACQUIRED BY THE M.G.L. MINING CORP. IN 1941 AND A MI-LL WAS BUILT AT THE MOUTH OF COWLES CANYON. MOST OF THE PRODUC-TION WAS DURING WORLD WAR II (1942-1945). A SMALL PRODUCTION W-AS REPORTED IN 1953-56 AND INCLUDED SEVERAL HUNDRED UNITS FROM- REWORKED TAILINGS. RECENTLY OVERSTAKED(?)(1985).BEFORE THE MINE WAS CLOSED IN 1945, THE OPERATORS DRILLED 82 DIAMOND DRILL HOLES TO EXPLORE TME AREA AND DELINEAT-E THE ORE BODIES. THIS EXPLORATION DID NOT DISCOVER ANY ADDITI-ONAL OREBODIES THAT COULD BE MINED PROFITABLY IN 1945.

Reference information

Bibliographic references

  • Deposit

    JOHNSON, M.G., 1977, GEOLOGY AND MINERAL DEPOSITS OF PERSHING COUNTY, NEVADA: NBMG BULL. 89

  • Deposit

    JOHNSON AND BENSON, 1963, TUNGSTEN RESOURCES OF NEVADA: USBM REPORT

  • Deposit

    HESS AND LARSEN, 1921, CONTACT-METAMORPHIC TUNGSTEN DEPOSITS OF THE U.S.; USGS BULL. 725-D

  • Deposit

    KERR, 1946, TUNGSTEN MINERALIZATION IN THE UNITED STTATES: GSA MEMOIR 15

  • Deposit

    VANDERBURG, 1936, RECONNAISSANCE OF MINING DISTRICTS IN PERSHING COUNTY; USBM 1C 6902.

  • Deposit

    STAGER, H. K., IN PREPARATION, NBMG BULL ON TUNGSTEN DEPOSITS OF NEVADA.

  • Deposit

    QUADE, JACK, 1 MAR 85, NBMG FIELD EXAMINATION AND SAMPLE ANALYSIS.

General comments

Subject category Comment text
Deposit AT SEVERAL PLACES 0.5 TO 1.0 MILE EAST OF THE M. G. L. MINE, SCHEELITE IS FOUND IN SMALL TACTITE INCLUSIONS IN GRA-NODIORITE WITHIN A FEW HUNDRED FEET OF THE MAIN MASS OF SEDIME-NTARY ROCKS. THESE INCLUSIONS ARE ALL SHALLOW, AS INDICATED BY- DIAMOND DRILLING BY THE M.G.L. MINING CORP., AND CONTAINED ON-LY A FEW HUNDRED TONS EACH OF MINEABLE ORE, MOST OF THIS ORE W-AS PROBABLY MINED DURING THE 1953-1956 PERIOD. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV
Deposit -SIX PRINCIPAL OREBODIES WERE MINED. THE LARGEST WAS IN THAT SO-UTH ROTATED BLOCK OF LIMESTONE. AT THE SURFACE, THIS BLOCK WAS- SURROUNDED BY HIGHLY QUARTZOSE TACTITE, 5-20 FT THICK, CONSIS-TING OF 70-90 % QUARTZ AND 10-30 % EPIDOTE, PYROXENE, HORNBLEN-DE AND GARNET WITH SMALL QUANTITIES OF SULFIDES. BETWEEN THIS -LAYER AND THE CENTRAL CORE OF MARBLE WAS A BAND OF SCHEELITE-B-EARING TACTITE ON THE SOUTH, WEST, AND NORTH SIDES OF THE BLOC-K. IN DEPTH, THE SCHEELITE-BEARING TACTITE THICKENED AT THE EX-PENSE OF THE MARBLE AND ABOUT 100 FT BENEATH THE OUTCROP, THE -MARBLE WAS REPLACED BY ORE ACROSS THE FULL WIDTH. AT 150 FT, T-HE ORE WAS CUT OFF BY GRANODIORITE. THE ORE MINED CONTAINED 0.-75 TO 1.0 % WO3. OTHER SMALLER OREBODIES TO THE NORTH ALSO CON-SISTED OF RIMS OF TACTITE ABOUT 5 FT WIDE AROUND CORES OF MARB-LE, SEPARATED FROM EACH OTHER BY TONGUES OF GRANODIORITE.
Deposit CONTACT ZONE IS BETWEEN A THICK SEQUENCE OF ARGILLACEOUS AND CALCAREOUS SEDIMENTARY ROCKS AND AN INTRUSIVE BODY OF- GRANODIORITE. THE CONTACT IS NEARLY CONFORMABLE BUT THE CONTA-CT ZONE IS INTRICATELY INJECTED BY GRANODIORITE, RESULTING IN -MIXED ROCKS. THE CENTRAL PART OF THE CONTACT ZONE CONSISTS OF -A BAND OF LIMESTONE ABOUT 80 FT WIDE, PARTIALLY ALTERED TO TAC-TITE. THE ROCKS ON EITHER SIDE ARE HORNFELS OR SCHIST, MIXED W-ITH GRANODIORITE. AT DEPTHS OF A FEW HUNDRED FEET, THE GRANODI-ORITE CUTS ACROSS THE SEDIMENTARY ROCKS AND CUTS OFF THE FAVOR-ABLE LIMESTONE BEDS. IN MOST OF THE CONTACT ZONE, BEDDING IS P-ARALLEL TO THAT IN THE MAIN MASS OF SEDIMENTARY ROCKS TO THE S-OUTHWEST. HOWEVER, AT THE SOUTH END OF THE MINE, AN IRREGULAR -BLOCK OF LIMESTONE ABOUT 80 FT WIDE AND 120 FT LONG, ENTIRELY -SURROUNDED BY GRANODIORITE AT THE SURFACE, HAS BEEN ROTATED 45- DEGREES. THIS BLOCK APPARENTLY FLOATED AS AN INCLUSION IN THE- GRANODIORITE AND NOT ONLY ROTATED, BUT ALSO MOVED 100 FT SW.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1979 Harner, Joy L. (Roberts, Ralph J.) Nevada Bureau of Mines and Geology
Updater 01-FEB-1986 La Pointe, D.D. (Tingley, J.V.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.