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Big Eight Mine

Troy, Montana

48.4372°N 115.9925°W

Mine Overview

The Big Eight Mine is near Troy, Montana. Historically the site has been associated with the Troy Mining District which is now part of the Kootenai National Forest. The site was first discovered in 1925. The Big Eight Mine was closed at the time of data entry with no known plans to re-open. The ore mined is composed of chalcopyrite, pyrrhotite and galena with waste material consisting primarily of garnet, chlorite and actinolite. As of 1983 there were two known tabular shaped ore bodies one of which extends 120 meters (393 feet) long, 2 meters (6 feet) wide, and 60 meters (196 feet) thick. Associated rock in this area is quartz monzonite from the Upper Cretaceous epoch 100.50 to 66.00 million years ago. The Northern Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.

Site identification and general characteristics. Learn about USGS mines.

  • Lead and Zinc Primary Commodity
  • Copper, Gold, and Silver Secondary Commodity
  • Cobalt Secondary Commodity
  • Site Record Type?
  • Mine Development Status?
  • Underground Operation Type?
  • 1925 Year Discovered?
  • Metallic Site Commodity Type?
  • Small Mine Size?
Big Eight Mine Near Troy, Montana

Big Eight Mine Near Troy, Montana

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Mine Names

  1. Name? Status?
  2. Big Eight Current
  3. Big Eight Mine Current
  4. Cabinet Lease Previous

Owner Name and Address

B. Taylor

1314 East 43d Avenue Spokane, Washington 99203
Type
Owner

E. Tunstill

P.O. Box 522 Troy, Montana 59935
Type
Operator

Commodities

Additional textual information about a site or mine.

  1. Commodity Type Importance
  2. Lead Metallic Primary
  3. Zinc Metallic Primary
  4. Copper Metallic Secondary
  5. Gold Metallic Secondary
  6. Silver Metallic Secondary
  7. Cobalt Metallic Tertiary

Deposit

DISCOVERY YEAR: EARLY 1900S

Location Info

  1. Continent Country State County
  2. North America The United States Montana Lincoln

Meridian / Township / Range Description

  1. Meridian? Township? Section? Aliquot?
  2. Montana Principle Meridian T.31N R.34W Sec. 19 NE

Land Status

Land status information.

  1. Land Status? Admin Area?
  2. National Forest -

Mining Districts

Formal or informal mining district names.

  1. District
  2. Troy Mining District

Workings

PROPERTY DEVELOPED BY 3 ADITS, TWO ON NORTH SIDE OF CALLAHAN CREEK-ONE SOUTH OF IT.

Materials

Minerals or other materials present in the mine.

  1. Role? Material?
  2. Gangue/Waste Actinolite
  3. Gangue/Waste Calcite
  4. Gangue/Waste Chlorite
  5. Gangue/Waste Garnet
  6. Ore Chalcopyrite
  7. Ore Galena
  8. Ore Pyrite
  9. Ore Pyrrhotite
  10. Ore Sphalerite
  11. Unknown Magnetite

Orebody

Characteristics of the ore body.

  • Area: 9.00 hectares (22.24 acres)
  • Length:
  • Width: 2.00 meters (6.56 feet)
  • Top Depth: 6.00 meters (19.69 feet)
  • Thickness: 60.00 meters (196.85 feet)
  • Strike: north 30 west
  • Dip: 80 west
  • Wallrock Alteration: none
  • Unconsolidated Material Thickness: 6 meters average
  • Ore Record Modified: 1983-03-16

  • Strike: north 22 west
  • Dip: vertical

Rocks

Geological materials at the site.

  1. Class? 1st Order Name? 2nd Order Name? 3rd Order Name? 4th Order Name? Most Specific Name? Begin Time End Time Description?
  2. Associated Rock Plutonic Rock Mafic Intrusive Rock Diorite - Diorite - - -
  3. Associated Rock Snowstorm Dike, Metadiorite; Dry Creek Stock, Quartz Monzonite Plutonic Rock Granitoid Quartz Monzonite Quartz Monzonite Upper Cretaceous Upper Cretaceous -
  4. Host Rock Metamorphic Rock Metasedimentary Rock Quartzite - Quartzite - - -
  5. Host Rock Prichard Formation-Quartzite, Argillite Plutonic Rock Mafic Intrusive Rock Diorite Diorite - - -

Structure

Geologic structural features affecting or characterizing the site or mine.

  1. Scale Description
  2. Local Local Post-Ore Fault Striking Northwest, Dipping 25 Degree Northeast Displaced Major Vein To Northwest
  3. Regional Spar Lake Syncline, Leonia Fault

Tectonic

Tectonic setting in which the site or deposit is situated.

  1. Setting?
  2. Cordilleran Miogeosyncline

Physiography

Physiographic area where the resource is found.

  1. Division Province? Section
  2. Rocky Mountain System Northern Rocky Mountains -

Holdings

Mineral rights ownership information.

  1. Type?
  2. Patented

Ore Control

Controls on emplacement of ore such as faults or other structural features.

  1. Text?
  2. Snowstorm Dike, Spar Lake Syncline, May Be Related To Dry Creek Stock

Reserve-resource

GRADES FROM ASSAY OF GRAB SAMPLE FROM DUMP TONNAGES ESTIMATED BY INVESTIGATOR.

Nearby Deposits

Other deposits in the same region.

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  10. Condor Mining And Leasing Gold Placer Site

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Nearby Places

Nearby Mining Districts

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Footnotes

* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.

** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.

1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.

Mining Claim News From The Diggings™

Learn more about the Bureau of Land Management, Public Land Survey System, and mining claims.

  1. Understanding Mine Ownership

    Understanding Claim Ownership

    We receive lots of emails from people who find their name or a relative’s name on our site and want to know if this means they have some right to the land listed under that name.

  2. open range landscape

    Understanding BLM Administrative Areas

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  3. Public Land Survey System map of the United States of America

    Understanding Location Data

    Mine handled by the Bureau of Land Management are not mapped by latitude and longitude, instead, these mines harken back to the Public Land Survey System.

  4. Historic map of the Ohio Western Reserve

    Understanding Townships

    A “township” can refer to two different things. Both are part of the PLSS measurement system but have different uses.

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