NBMG Sample Site 2611

Site Name

Primary: NBMG Sample Site 2611

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Commodity

Primary: Tungsten
Secondary: Silver
Tertiary: Molybdenum

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Location

State: Nevada
County: Humboldt
District: Potosi District; Getchell District

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Not available

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Workings

Type: Surface/Underground

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Ownership

Owner Name: Frm Corp
Years: 1984 -

Owner Name: Getchell Mine. Inc.

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Production

Year: 1957
Time Period: 1951-1957
Material type: ORE
Description: Cp_Grade: ^Ave. 0.37, Wo3

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Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Contact Metamorphic
Operation Type: Unknown
Year First Production: 1951
Discovery Year: 1917
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: M

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Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin And Mountains

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Mineral Deposit Model

Model Name: W skarn

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Orebody

Form: TABULAR, ALONG IGNEOUS CONTACT

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Structure

Type: R
Description: Reg.Struct: Getchell Fault System

Type: L
Description: Fault Along Range-Front; Ne-Trending Offset Fault

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Alterations

Alteration Type: L
Alteration Text: Silicification, Bleaching

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Rocks

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

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Analytical Data

Analytical Data: SAMPLE 2611, A DUMP SAMPLE OF GARNET-EPIDOTE-DIOPSIDE-QUARTZ SKARN WITH TRACE SCHEELITE, MOLYBDENITE, CHALCOPYRITE-, PYRITE, CONTAINS 20 % FE, 1 % MG, 20 % CA, 0.1 % TI, +5000 P-PM MN, 30 PPM AG, 100 PPM B, 2 PPM BE, 70 PPM BI, 50 PPM CO, 1-000 PPM CU, 300 PPM MO, 10 PPM NI, 1000 PPM PB, 30 PPM SN, 500- PPM V, 300 PPM W, 30 PPM Y, 500 PPM ZN, 15 PPM ZR.

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Materials

Ore: Scheelite
Ore: Pyrite
Ore: Chalcopyrite
Ore: Sphalerite
Ore: Galena
Ore: Pyrrhotite
Gangue: Garnet
Gangue: Wollastonite
Gangue: Pyroxene

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Comments

Comment (Deposit): ONE OF THE EARLIEST TUNGSTEN PROPERTIES DEVELOPED IN THE AREA WAS RILEY. GETCHELL MINE INC.'S UNDERGROUND MINING, HERE AT RILEY EXTENSION BEGAN IN 1951; OPEN PIT ON WEST OREBODY LATER. 3 TACTITE BODIES. THE EASTERN MOST OF WHICH IS THE NORTHWARD CONTINUATION OF THE RILEY MINE OREBODY. RILEY AND RILEY EXTENSION MINES COMPRISE THE LARGEST SINGLE TACTITE DEPOSIT IN THE DISTRICT. RECENT EXPLORATION (GEOLOGIC MAPPING AND DRILLING) DEFINES AREAS CONTAINING APPROXIMATELY 186,000 TONS OF TUNGSTEN ORE IN THE RILEY EXTENSION AREA. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV

Comment (Reserve-Resource): BETWEEN THE 400 AND 800 LEVELS OF THE MINE.

Comment (Location): S 1/2 OF S 1/2 SEC. 4; S. OF HANSEN CANYON.

Comment (Production): 229,000 TONS ORE AVG. 0.37% WO3, PLUS UNMINED RESERVES OF APPROX. 41,700 TONS OF 0.4, WO3 ORE BETWEEN 400 AND 800 LEVELS.

Comment (Development): RECENT WORK DEFINES 186,000 TONS ORE IN THIS AREA

Comment (Workings): VERTICAL SHAFT 400 FT DEEP, INCLINED WINZE FROM 400 TO 800 LEVEL, OPEN PIT, REMAINS OF STEEL HEADFRAME. SHAFT FLOO-DED TO ABOUT 200 FT LEVEL, (1984).

Comment (Geology): 3 TACTITE ZONES; THE EAST VEIN "EXTENDS ALONG THE GRANODIORITE CONTACT FOR ABOUT 1600 FT, MINED ON BOTH RILEY AND RILEY EXTENSION PROPERTIES. THE MAIN OREBODY WAS A TABULAR MASS OF TACTITE MINED FOR APPROX. 800 FT. DOWN DIP, AVERAGING 10 FT. THICK. PREBLE FORMATION LIMESTONE LENSES IN HORNFELS; MOST IMPORTANT IS THE 200-FT THICK RILEY LIMESTONE, THIN-BEDDED, WITH SHALEY PARTINGS.

Comment (Deposit): LARGEST OF THE 3 TACTITE ORE ZONES IS THE EASTERN ONE, A CONTINUATION OF THE RILEY TACTITE. THE MIDDLE AND WESTERN- ZONES ARE THINNER TACTITE BANDS FORMED IN LIMESTONE UNITS WHI-CH LIE DOWN-SECTION (WEST) OF THE RILEY LIMESTONE. THE MIDDLE -OREBODY WAS DISCOVERED UNDERGROUND AND DOES NOT CROP OUT AT TH-E SURFACE. THE WESTERN OREBODY WAS MINED FROM THE SURFACE. THE- LIMESTONES DIP 40-50E AND THE GRANODIORITE CONTACT IS GENERAL-LY CONFORMABLE TO THE STRIKE AND DIP OF THE SEDIMENTS. PRE-INT-RUSIVE FOLDING OF THE LIMESTONE INTO GENTLE, ASYMMETRICAL FOLD-S HAS RESULTED IN A "SCALLOPED" CONTACT CONFIGURATION, AND THE- RICHEST ORE HAS FORMED WHERE SYNCLINAL TROUGHS INTERSECT THE -CONTACT FORMING EMBAYMENTS SHAPED LIKE CONE SEGMENTS. TO THE E-AST, DOWN DIP, THE CONTACT STEEPENS AND PASSES INTO HORNFELS W-HICH LIES BELOW THE LIMESTONE, LIMITING THE EXTENT OF THE TACT-ITE TO THE EAST.

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References

Reference (Deposit): WILLDEN,R., 1964, GEOLOGY AND MINERAL DEPOSITS OF HUMBOLDT CO., NEV: NEV. BUREAU OF MINES BULL. 59.

Reference (Deposit): HOTZ, P.E. AND WILLDEN, R., 1964, GEOLOGY AND MINERAL DEPOSITS OF THE OSGOOD MOUNTAINS QUAD. HUMBOLDT CO., NEV: U.S.G.S. PROF. PAPER 431.

Reference (Deposit): TINGLEY, J.V., 1978, UNPUBLISHED REPORT ON THE GETCHELL TUNGSTEN PROJECT, ON FILE AT THE NEV. BUREAU OF MINES

Reference (Deposit): STAGER, H. K., IN PREPARATION, NBMG BULLETIN ON TUNGSTEN DEPOSITS OF NEVADA.

Reference (Deposit): TINGLEY, J. V., NBMG FIELD EXAMINATION AND SAMPLE ANALYSIS, 6 SEP 84.

Reference (Deposit): SCHILLING, JOHN, 1979, NBMG OFR 79-3, MOLYBDENUM RESOURCES OF NEVADA.

Reference (Production): HOTZ, P.E. AND WILLDEN, R., 1964

Reference (Reserve-Resource): STAGER, IN PREP

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.