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NBMG Sample Site 2635

Occurrence in Humboldt county in Nevada, United States with commodities Gold, Silver, Copper, Lead, Zinc, Arsenic
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Geologic information

Identification information

Deposit ID 10047272
MRDS ID M242549
Record type Site
Current site name NBMG Sample Site 2635
Related records 10198681

Geographic coordinates

Geographic coordinates: -118.10209, 40.88461 (WGS84)
Elevation 1490
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Geographic areas

Country State County
United States Nevada Humboldt

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 035N 034E 25 Nevada

Comments on the location information

  • INFO FROM LAND.ST :(1972)

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Lead Secondary
Zinc Secondary
Arsenic Tertiary

Materials information

Materials Type of material
Gold Ore
Hematite Gangue
Quartz Gangue

Alteration

  • (Local) Kaolinization Of Wallrock Near Veins; Silication

Analytical data

Result SAMPLE 2635 OF CRUSHED, RECEMENTED WHITE VEIN QUARTZ WITH GREEN ARSENATE (?) FRACTURE COATING CONTAINS 5% FE, .05% MG, 3% CA, 0.07% TI, 1000 PPM MN, 700 PPM AG, 5000 PPM AS, 150 PPM B, 50 PPM BA, 1 PPM BE, 500 PPM CD, 1500 PPM CU, 15 PPM MO, 10 PPM NI, 10000 PPM PB, 1000 PPM SB 20 PPM V, 10 PPM Y, 3000 PPM ZN, 50 PPM ZR. AA ANALYSIS ALSO SHOWS 0.5 PPM AU.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

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

Nearby scientific data

(1) -118.10209, 40.88461
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Geologic structures

Type of structure Local
Structure description Fractures, Slickensides

Ore body information

  • General form TABULAR
    Strike N 25-30 E
    Dip 75 E-90
    Thickness 0.61M

Controls for ore emplacement

  • Shear Zone

Comments on the geologic information

  • THE TOP OF THE SMALL HILL AT THE PROSPECT IS UNDERLAIN BY DIORITE, SILICATED ROCKS LIE BOTH EAST AND WEST OF THE DIORITE

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Mill City District; Central District

Land status

Ownership category BLM Administrative Area

Comments on the workings information

  • 2 VERTICAL SHAFTS, CUTS

Comments on development

  • INACTIVE IN 1984

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M242549

Bibliographic references

  • Deposit

    TINGLEY, J.V., 1984, NBMG FIELD EXAMINATION, 9/21/84

General comments

Subject category Comment text
Deposit WORKINGS EXPLORE QUARTZ VEINS ALONG SHEAR ZONES IN DIORITE AND HORNFELS. EASTERN SHAFT IS IN DIORITE; WESTERN SHAFT HAS DIORITE ON EAST WALL, HORNFELS ON WEST. VEINS ARE MOSTLY WHITE QUARTZ, BUT ARE BRECCIATED AND RECEMENTED WITH QUARTZ AND HEMATITE. WALLROCK KAOLINIZED NEAR VEINS. CLOTS OF PALE GREEN CRYSTALLINE MINERAL (ARSENATE?) COAT FRACTURE SURFACES, SLICKENSIDES ON FAULT SURFACES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1985 La Pointe, D.D. (Tingley, J.V.) Nevada Bureau of Mines and Geology
Updater 01-SEP-1994 Li, Zhiping (Peters, S.) U.S. Geological Survey