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United States
Rosebud (Colstrip) Mine

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 Location:
139 km E from Billings, Montana, United States

  Address:
138 Rosebud Lane
P.O. Box 99
Colstrip
Montana, United States
59323
Phone  ...  Subscription required
Fax406-748-5181
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (thermal)
Mining Method
  • Truck & Shovel / Loader
  • Dragline
Production Start...
Mine Life2038
Westmoreland Coal Company became a privately held company on March 15, 2019. The company has not publicly reported 2018-2020 Rosebud Mine production data.


Owners

Source: p. 58
CompanyInterestOwnership
Westmoreland Mining LLC (WML) 100 % Indirect
Westmoreland Rosebud Mining LLC. (operator) 100 % Direct
The mine is operated by Westmoreland Rosebud Mining LLC, a subsidiary of Westmoreland Mining LLC.

Contractors

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Deposit Type

  • Sedimentary


Summary:

Currently, four active mine areas at the Rosebud Mine operate: Area A; Area B; Area C; and Area F. The Rosebud Mine is located in the northwestern portion of the Powder River structural basin, a broad northeast-trending synclinal structural basin in eastern Wyoming and southeastern Montana bound on three sides by mountain uplifts. The Paleocene Fort Union Formation is the predominant bedrock unit in the vicinity of the Rosebud Mine and consists of gently dipping (less than a few degrees) sedimentary rocks. Coal is within the Tongue River Member of the Fort Union Formation. The highest coal bed in the analysis area stratigraphic sequence is the Rosebud Coal bed, which averages 22.6 feet thick over the permit area. The next coal seam located below the Rosebud Coal bed is the McKay Coal bed, which averages 7.9 feet thick. Rosebud Mine Area B lies within the East Fork Armells Creek and Middle Rosebud Creek drainage basins. In the Colstrip area, the Fort Union Formation is 445 feet thick and thickens to the south to a maximum of 2,125 feet. Geologic formations that are exposed at the surface are limited to the Tongue River Member of the Paleocene Fort Union Formation, and Quaternary Alluvium. Quaternary-age alluvium and colluvium overlie the Tongue River Member locally, mostly along drainageways. Within the analysis area, relatively thin deposits of silty clay and gravelly sand comprise the Quaternary alluvial fill occurring within portions of Richard Coulee. Thin unmapped uncon ........


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The mine is located near Colstrip, Montana. Overburden is removed exposing the Rosebud coal seam utilizing four draglines and is deposited in previously mined pit areas. The coal is loaded by front-end loaders into 100 ton and 200 ton haul trucks for transport to areas where the 2 coal is stockpiled. The coal seam averages 20 to 25 feet in thickness and overburden thicknesses vary from 20 feet to more than 200 feet. Rosebud is a large operation with three active pits and supplies almost all of its current production to the four-unit 2,100 megawatt Colstrip Power Station that is adjacent to the mine and was specifically designed to burn Rosebud coal. Number of Draglines Removing Overburden - 4. The Rosebud Mine Area F expansion project is located 12 miles west of Colstrip, Montana, in Rosebud and Treasure counties. The Area F project would expand the Rosebud Mine, which currently is a 25,576-acre surface coal mine producing low-sulfur subbituminous coal. The coal mining method proposed would be the same area strip mining method that currently uses in other permitted areas of the Rosebud Mine. In advance of each mining pass, soil would be removed from the area and stockpiled according to type for use later during reclamation. Next, the overburden (sedimentary rock material covering the coal seams) would be drilled and blasted. Overburden from the initial cut would be stockpiled as spoil. A dragline would then be used to strip the overburden from succeeding mine passes. S ........


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits202120202019201820172016
Coal (thermal) k tons  ......  Subscription required  ......  Subscription required  ......  Subscription required8,3938,6368,798
Heat ContentBTU/lb8,5508,5008,417
Sulfur%0.640.640.640.690.68
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Coal tonnes mined  ......  Subscription required  ......  Subscription required8,456 k tons of ROM coal8,393 k tons of ROM coal8,636 k tons of ROM coal8,798 k tons of ROM coal
Annual mining capacity  ......  Subscription required  ......  Subscription required13,300 k tons of ROM coal13,300 k tons of ROM coal
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Reserves at December 31, 2017:

CategoryTonnage Commodity
Proven 241,087 k tons Coal (thermal)
Proven & Probable 241,087 k tons Coal (thermal)


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of December 31, 2020:
HME TypeSizeQuantity
Dragline ....................... Subscription required
Excavator 20 cu. yd ....................... Subscription required
Loader 30 cu. yd ....................... Subscription required
Truck (haul) ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 24, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Environmental Impact Statement 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Other 2018
Form 10-K 2017
Other 2017
Form 10-K 2016
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
Subscription required - Subscription is required.

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