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Bunker Hill Mine

Unionville, Montana

46.4693°N 112.2488°W

Mine Overview

The Bunker Hill Mine is near Unionville, Montana. Historically the site has been associated with the Rimini Mining District which is now part of the Deerlodge National Forest. The Bunker Hill Mine was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. Mine operations consist of 2 distinct underground workings. There is one known shaft. Subsurface depth reaches a maximum of 300 meters (984 feet) and extends 366 meters (1,200 feet) in length. The ore mined is composed of gold, galena and sphalerite with waste material consisting primarily of quartz, sericite and tourmaline. The ore body extends 609 meters (2,000 feet) long and 1 meters (4 feet) wide. 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 Silver Primary Commodity
  • Gold and Zinc Secondary Commodity
  • Arsenic Secondary Commodity
  • Site Record Type?
  • Mine Development Status?
  • Underground Operation Type?
  • 1888 First Year Of Production?
  • Small Production Size?
  • Metallic Site Commodity Type?
  • Small Mine Size?
Bunker Hill Mine Near Unionville, Montana

Bunker Hill Mine Near Unionville, Montana

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Mine Names

  1. Name? Status?
  2. Bunker Hill Current
  3. Bunker Hill Mine Current

Owner Name and Address

Montana Lead Company

Type
Operator

Commodities

Additional textual information about a site or mine.

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

Deposit

ADIT NO. 1 IS THE LOWES, THE VEIN IS 3 FEET OR LESS IN WIDTH BOUNDED BY PARALLEL JOINTS; ADIT NO. 2 LESS CONTINUOUS CONTROLLING JOINTS, IT HAS 2 QUARTZ-TOURMALINE VEINS 1-5 FEET IN WIDTH. THIS VEIN ZONE SEEMS TO HAVE BEEN A CHANNEL WAY FOR HYDROTHERMAL SOLUTIONS. ADIT NO. 3 HAS SEVERAL BRANCHES WHICH CONTINUE EAST BUT THE DIP FLATTENS.

Location Info

  1. Continent Country State County
  2. North America The United States Montana Lewis and Clark

Notes

E SIDE OF TENMILE CREEK.; INFO FROM LAND. ST : (1950).

Meridian / Township / Range Description

  1. Meridian? Township? Section? Aliquot?
  2. Montana Principle Meridian T.8N R.5W Sec. 5 SE
  3. Montana Principle Meridian T.8N R.5W Sec. 4 -

Land Status

Land status information.

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

Mining Districts

Formal or informal mining district names.

  1. District
  2. Rimini Mining District

Workings

Workings at the site.

Underground Workings #1

  • Type: Underground
  • Sub Surface Length: 365.76 Meters

Underground Workings #2

  • Type: Underground
  • Sub Surface Depth: 300 Meters
  • Mining Method: Horizontal Cut And Fill With Waste Rock
  • Status of Mining Method: Proposed
  • Capacity: 228 mt ore/day
  • Production Unit Cost: 28 $/mt ore
  • Operating Days Per Year: 284
  • Operating Shifts Per Day: 3
  • Year of Information: 1977
  • Rock Chars: No Planes Of Weakness
  • Rock Support Chars: Supporting May Back Slab
  • Mine Support Chars: Post, Headboard, Caps, Roof Bolts
  • Number of Shafts: 1

Workings

3 ADIT DRIFTS,

Materials

Minerals or other materials present in the mine.

  1. Role? Material?
  2. Gangue/Waste Quartz
  3. Gangue/Waste Sericite
  4. Gangue/Waste Tourmaline
  5. Ore Galena
  6. Ore Gold
  7. Ore Sphalerite
  8. Unknown Arsenopyrite
  9. Unknown Chalcopyrite
  10. Unknown Pyrite
  11. Unknown Tetrahedrite

Orebody

Characteristics of the ore body.

  • Area: 3.70 hectares (9.14 acres)
  • Length:
  • Width: 0.60 meters (1.97 feet)
  • Top Depth: 3.00 meters (9.84 feet)
  • Thickness: 183.00 meters (600.39 feet)
  • Strike: north 10 west
  • Dip: 85 south
  • Type of Wallrock: sericitic
  • Wallrock Alteration: intense
  • Ore Control: faulting
  • Unconsolidated Material Thickness: 3 meters average
  • Ore Record Modified: 1981-12-30

  • Length:
  • Width: 1.22 meters (4.00 feet)
  • Bottom Depth: 182.88 meters (600.00 feet)
  • Dip: 75 south

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 Butte Quartz Monzonite (Boulder Batholith) Plutonic Rock Granitoid Quartz Monzonite Quartz Monzonite Upper Cretaceous Upper Cretaceous -
  3. Host Rock Plutonic Rock Granitoid Quartz Monzonite - Quartz Monzonite - - -

Structure

Geologic structural features affecting or characterizing the site or mine.

  1. Scale Description
  2. Local Red Mountain Fault
  3. Regional Boulder Batholith

Physiography

Physiographic area where the resource is found.

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

Alteration

Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.

  1. Type? Alterations
  2. Local Sericitization

Analytical Data

Results of chemical or mineralogical analysis on materials at or near the site

  1. Line? Analysis Data?
  2. 1 ADIT NO. 1: 0.5 OUNCE PER TON GOLD, 14 OUNCE PER TON SILVER, 9 % LEAD, 5% ZN; ADIT NO. 2: 0.15 OUNCE PER TON GOLD, 20 OUNCE PER TON SILVER, 5% LEAD, 2 % LEAD, A LITTLE COPPER

Holdings

Mineral rights ownership information.

  1. Type?
  2. Patented

Production

Production information

  1. Production Year? Amount Mined? Material? Comment
  2. 1888-1891 11 wt-pct Lead 0.22 ounces per ton gold, 30 ounces per ton silver, 11% lead
  3. 1888-1891 847 grams/metric ton Silver 0.22 ounces per ton gold, 30 ounces per ton silver, 11% lead
  4. 1947 5 wt-pct Lead 0.15 ounces per ton gold, 20 ounces per ton silver, 5% lead, 2% zinc
  5. 1947 565 grams/metric ton Silver 0.15 ounces per ton gold, 20 ounces per ton silver, 5% lead, 2% zinc

Notes

PRODUCTION WAS RECORDED IN 1942

Reserve-resource

GRADES FROM 701, PRODUCTION STATISTICS TONNAGES ESTIMATED BY INVESTIGATOR DATA ARE SUPPORTED IN REPORTS IN BACKUP F.

Nearby Deposits

Other deposits in the same region.

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  4. Teal Lake Mine

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  5. Evergreen Lead Mine

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  6. Evergreen Silver Mine

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  7. Daniel Stanton Mine

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  8. Hamlet Silver Mine

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  9. S. P. Bassett Gold Prospect

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  10. S. P. Bassett Lead Occurrence

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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.

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