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Orofino Group

Past Producer in Idaho county in Idaho, United States with commodities Gold, Silver, Copper, Bismuth, Tungsten
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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. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10071565
MRDS ID W015023
MAS/MILS ID 0160490670
Record type Site
Current site name Orofino Group
Alternate or previous names Mildred, Estep, Arrastre

Geographic coordinates

Geographic coordinates: -115.24566, 45.20428 (WGS84)
Elevation 2195
Relative position 6.5 MI NE OF BIG CREEK (TOWN)

Site location context

Political divisions (FIPS codes)

Idaho(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bismark Mountain(quadrangle 1:24,000 scale)

Warren(quadrangle 1:100,000 scale)

Elk City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Middle Fork Salmon(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Payette National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Frank Church-River of No Return Wilderness(Wilderness)

Wilderness FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Idaho

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 022N 010E 28,29,32,33 NE (32) Idaho

Comments on the location information

  • At Head Of E. Fk. Milligan Creek; Plotted At Corner Of 4 Sections Land Status Value Calculated 7-94 Using GIS Overlay Analysis With USFS Land Ownership Boundaries, 1:126,720 Scale.

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Tertiary
Bismuth Critical Tertiary
Tungsten Critical Tertiary

Comments on the commodity information

  • Chip And Random Samples Produced Gold Values From Trace To 146 Grams, Silver Trace To 37.7 Grams Per Metric Ton, Copper From 0.01 To 6.4 Percent. Anomalous Amounts Of Bismuth, Tungsten Were Detected In A Few Samples Taken From Quartz Veins Exposed Near Three Adits.

Materials information

Materials Type of material
Bismuth Ore
Chalcopyrite Ore
Limonite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Fe Stains, Oxidation, Chloritization

Analytical data

Result ASSAYS HAD TRACE TO 0.52 OZ. AU/TON ON NW SIDE OF CREEK. ON SE SIDE, OVERALL GRADE IS 0.06 OZ AU, 0.11 OZ AG/TON, 0.15% CU. SOME SAMPLES HAD 0.05 - 0.14% BI, 0.02 - 0.11% WO3

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Syenite
    Rock unit name Idaho Batholith-Quartz, Gneissic Diorite;Ramey Ridge Complex-Syenite
    Rock description Idaho Batholith-Quartz, Gneissic Diorite;Ramey Ridge Complex-Syenite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Syenite
    Rock unit name Yellowjacket Formation-Argillite, Quartzite, Schist
    Rock description Yellowjacket Formation-Argillite, Quartzite, Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -115.24566, 45.20428
ListMap

Economic information

Ore body information

  • General form PINCH AND SWELL, LENTICULAR
    Strike N 85 DEG E
    Dip N
    Length 609.6M
    Width 3.05M

Controls for ore emplacement

  • Shear Zone, Fracture

Comments on the geologic information

  • Shenon And Ross (1936) Believe The Host Rocks Are Cret Gneissic Diorite Of Idaho Batholith; Lorain (1938) Believes It Is Quartz Magnetite Diorite Of The Batholith; Cater And Others (1973) Say It Is Syenite Of Ramey Ridge Complex

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1906
Discoverer T. G. Thomas

Mining district

District name Ramey Ridge District

Land status

Ownership category National Forest
Area name Payette National Forest
Ownership category National Primitive Area
Area name Idaho Primitive Area

Ownership information

  • Type Operator
    Owner Ray Nissoula, Lew Morgan
    Home office Idaho
  • Type Owner
    Owner Walter Estep, Ray Nissoula, Lew Morgan
    Home office Idaho

Comments on the production information

  • Value Item 8 $37 In Au; Value Item 9, $2718 In Au, Ag

Workings at the site

  • Type of workings Surface/Underground
    Length 19.81M
    Overall length 403.86M

Comments on development

  • Mill, 5 Claims; Located In 1906 As The Mildred, Was Relocated As The Arrastre Group In The 1950'S And Was Later Changed To The Orofino Group

Reference information

Bibliographic references

  • Deposit

    Lorain, S. H., 1938, Gold Mining And Milling In Idaho County, Idaho: USBM Inf. Circ. 7039, 90 P.

  • Deposit

    Cater, F. W., And Others, 1973, Mineral Resources Of The Idaho Primitive Area And Vicinity, Idaho: USGS Bulletin 1304, 431 P.

  • Deposit

    Shenon, P. J., And Ross, C. P., 1936, Geology And Ore Deposits Near Edwardsburg And Thunder Mountain, Idaho: Idaho Bureau Of Mines And Geology Pamphlet 44, 45 P.

  • Deposit

    1936 Geolmap Idaho Bureau Of Mines And Geology Pamphlet 44

  • Deposit

    1938 Recon USBM Inf. Circ. 7039

  • Deposit

    1973 Recon F. W. Cater And Others, Bulletin 1304

  • Production

    Cater, F. W., And Others, 1973, USGS Bulletin 1304

General comments

Subject category Comment text
Deposit 2 Or More Parallel Fracture - Filling Quartz Veins

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1976 Siefken, Robert R. (Miller, Pat) U.S. Geological Survey
Reporter 30-DEC-1996 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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