Last Chance Mine

Past Producer in Elmore county in Idaho, United States with commodities Gold, Silver

Geologic information

Identification information

Deposit ID 10070027
MRDS ID W007865
MAS/MILS ID 0160390007
Record type Site
Current site name Last Chance Mine

Geographic coordinates

Geographic coordinates: -115.11263, 43.77879 (WGS84)
Elevation 2134
Relative position 1.6 MI SSE OF ATLANTA
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Geographic areas

Country State County
United States Idaho Elmore

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 005N 011E 11 Idaho

Comments on the location information

  • Adjoins The Monarch Mine On The South; Previous Quad Designation = Boise 1:250000; Latitude-Longitude Values Calculated From Township, Range, Section.

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Quartz Gangue

Analytical data

Result OXIDIZED ORE YIELDED $100/TON, 1880'S PRICES (50% FREE AU, 20 TO 30% SULFIDES, BALANCE IN AG). LOWEST LEVEL, 2-INCH QUARTZ VEIN ASSAYED $133/TON, 10-INCH VEIN, $14/TON, AND 36-INCH VEIN, $8.50/TON.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Idaho Batholith-Granodiorite, Porphyritic Quartz Monzonite
    Rock description Idaho Batholith-Granodiorite, Porphyritic Quartz Monzonite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -115.11263, 43.77879

Ore body information

  • General form POCKETS , POD/LENS
    Strike S 85 DEG E
    Dip STEEPLY S
    Width 0.91M
    Length 182.88M

Controls for ore emplacement

  • Fracture

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery method Ore-Mineral In Place

Mining district

District name Or Middle Boise District

Land status

Ownership category National Forest
Area name Boise National Forest

Ownership information

  • Type Owner
    Owner Atlanta Mines Co.

Comments on the production information

  • Reported To Have Produced Small Lots Of Very Rich Ore.

Workings at the site

  • Type of workings Underground
    Length 336.8M
    Overall depth 103.63M

Comments on the workings information

  • Workings Mainly In And Along Gulch Above Monarch.

Comments on development

  • 10 - Stamp Steam Mill

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W007865
Idaho Geological Survey Idaho Mines and Prospects IMP HA__68 http://www.idahogeology.org/
U.S. Bureau of Mines Minerals Availability System MAS 0160390007 data consolidated into this record

Bibliographic references

  • Deposit

    Anderson, A. L., 1939, Geology And Ore Deposits, Atlanta District Elmore Co., Idaho: Idaho Bureau Of Mines & Geol. Pam. 49, P. 61

  • Deposit

    1939 Geolmap Idaho Bureau Of Mines & Geol. Pam. 4

  • Production

    Anderson, A. L., 1939, Idaho Bureau Of Mines & Geol. Pam. 49, P. 62

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1975 Steigner, William D. U.S. Geological Survey
Updater 01-AUG-1976 Everett, Sandra E. U.S. Geological Survey
Reporter 01-MAR-1995 Western Field Operations Center (WFOC) U.S. Bureau of Mines