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Monolith Group Mine

Past Producer in Lemhi county in Idaho, United States with commodities Gold, Lead, Silver, Zinc
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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. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Production statistics
  17. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10071457
MRDS ID W014859
MAS/MILS ID 0160590430
Record type Site
Current site name Monolith Group Mine

Geographic coordinates

Point of reference Geographic coordinates: Elevation UTM Precision Relative position Point location
-114.28787, 45.38488 (WGS84) 1372 1 MI N OF SHOUP
(click for info)
-114.29533, 45.38318 (WGS84) 100 Per IBMG

Site location context

Political divisions (FIPS codes)

Lemhi(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Shoup(quadrangle 1:24,000 scale)

Bighorn Crags(quadrangle 1:100,000 scale)

Elk City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Middle Salmon-Panther(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Salmon-Challis National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Lemhi

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 024N 018E 25 Idaho

Comments on the location information

  • E Side Of Boulder Creek

Commodities

Commodity Importance
Gold Primary
Lead Tertiary
Silver Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Biotite Gangue
Feldspar Gangue
Muscovite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Oxidation
  • (Local) Sericitization
  • (Local) Calcite

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Pliocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Dikes-Granite Porphyry, Quartz Diorite Porphyry, Basalt Lamprophyre;Gneissic Granite
    Rock description Dikes-Granite Porphyry, Quartz Diorite Porphyry, Basalt Lamprophyre;Gneissic Granite
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
    Rock unit name Belt Supergroup
    Rock description Belt Supergroup-Quartzite, Slate, Gneiss , Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -114.28787, 45.38488
ListMap
(2) -114.29533, 45.38318
ListMap

Economic information

Geologic structures

Type of structure Local
Structure name Faults
Type of structure Local
Structure name Gouge
Type of structure Local
Structure name Brecciation

Ore body information

  • General form TABULAR
    Strike N 12 DEG E
    Dip 20 DEG SE
    Length 182.88M
    Width 1.22M

Comments on the geologic information

  • Original Structures entry:
    Local - Minor Faults; Schistosity Dips 35 - 44 Deg N , Gouge, Breccia
  • Original alteration entry:
    Local - Oxidation, Sericitization, Calcite

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1882
Discoverer Walter Stanley And Others

Mining district

District name Mineral Hill District

Land status

Ownership category National Forest
Area name Salmon National Forest

Production statistics

  • Year 1913
    Material ORE
    Accuracy Estimate
    Description Ap_Grade: ^2. % Pb, 5. % Zn, 3 Oz/Ton Ag
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Ore Silver Silver 85g/mt
    Ore Lead Lead 2wt-pct
    Ore Zinc Zinc 5wt-pct

Comments on the production information

  • $175,000 Production In 1913 ; $200,000 Produced In Ag ( Gray, 1929 )

Comments on development

  • Tramway, 20 - Stamp Mill; Claims Include The Johnson, Johnson No. 1, Douglas, Douglas No. 1, Massachusetts And Merry Widow

Reference information

Bibliographic references

  • Production

    Umpleby, J. B., 1913, USGS Bulletin 528, P. 143.

  • Deposit

    Umpleby, J. B., 1913, Geology And Ore Deposits Of Lemhi County, Idaho: USGS Bulletin 528, P. 143.

  • Deposit

    Sturm, F. H., 1954, General Geology Of Some Replacement Monazite Deposits In Lemhi County, Idaho: Moscow, Idaho, Univ. Of Idaho, M.S. Thesis, 64 P.

  • Deposit

    Gray, F. A., 1927, Ore Deposits Of The Mineral Hill District, Lemhi County, Idaho: Minneapolis, Minnesota, Univ. Of Minnesota, Phd Thesis.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-76 Duncan, Daniel G. (Miller, Pat) U.S. Geological Survey
Reporter 15-OCT-90 Western Field Operations Center (WFOC) U.S. Bureau of Mines

Beyond USGS

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

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