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United States
North Antelope Rochelle Mine

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 Location:
86 km S from Gillette, Wyoming, United States

  Address:
Caller Box 3035
Gillette
Wyoming, United States
82717
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • 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 Life2047
North Antelope Rochelle Mine (NARM) is the world’s largest coal mine with the cleanest coal in the United States.


Owners

Source: p. 48,399
CompanyInterestOwnership
Peabody Energy, Inc. 100 % Indirect
Peabody Powder River Mining, LLC (operator) 100 % Direct
Peabody Powder River Mining, LLC operates as a subsidiary of Peabody Energy Corp.

Contractors

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Deposit Type

  • Sedimentary


Summary:

The Wasatch Formation and local Quaternary age deposits comprise all of the overburden lithologies at the mine site. The Wasatch consists of alternating, lenticular deposits of sandstones, siltstones, claystones, coal, and carbonaceous shales. Coal has been mined exclusively from the Wyodak-Anderson (WA) Seam. The remaining coal is 50-87 ft thick and 180 to 460 ft deep within the leased area. The WA seam is in the uppermost section of the Paleocene Fort Union Formation. The coal is thickest on the northwest side of the lease. There are two main geologic features at NARM. The first is a monocline that exists in a northwest to southeast trend over the middle portion of the mine. The lower 12-14 feet of the WA seam splits off as a hanger seam (Lower Wyodak-Anderson, or LWA) and has a steeply dipping gradient after it splits. The LWA seam is not mined because of poor quality and an increasingly high strip ratio. The mineable WA coal thickness averages 80 feet in the west and 60 feet east of the monocline. The second geologic feature is a ribbon split occuring in the southwest portion of the lease and trending northwest to the southeast. The WA splits into two nearly equally thick (30-35 ft) mineable seams: WA1 (upper split) and WA2 (lower split). The midburden between the WA1 and WA2 increases to a maximum of 120 ft thick. Structurally, the WA2 seam remains relatively flat, whereas the WA1 rides up over the parting and has a dipping structure. In conclusion, several thin ride ........


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The relatively shallow and very thick coal seam at this deposit determines that the most efficient mining method is the surface striping method which utilizes a combination of processes, including truck and shovel, cast blasting and dozing, dragline, etc. As a result of the high volume of sales with a wide range of quality requirements, the mining operation consists of multiple open pits mainly in four mining areas: West, North, East, and NARM North.

Conventional and cast blasting methods are generally used to fracture and fragment overburden and coal. After the cast blast and before the dragline operation, the backhoes are utilized to remove the shot material in the highwall and scale the highwall back to competent material down to a dragline bench operating level. Dozers are used to push more blasted material into the previous pit where the coal has been removed and at the same time prepare the working bench for the dragline. The dragline typically mines cuts that are 220 feet wide and with a bench height of 140-220 feet. The dragline is typically positioned on the spoil side of the pit when removing this remaining overburden. This allows for much of the dragline's spoil material to be stacked further from the low wall crest to reduce the overall spoil bank slope angle (internal angle of friction) to approximately the natural angle of repose of the shot material and thus minimize the risk of spoil slope failures or loose material rolling into the pit area. Oth ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2022202120202019201820172016
Coal (thermal) M tons  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required9810293
Heat ContentBTU/lb8,8008,8008,8008,8008,8008,800
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Coal tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required85,340,711 tons of ROM coal98,315,794 tons of ROM coal101,595,323 tons of ROM coal
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Reserves at December 31, 2022:

CategoryTonnage Commodity
Proven 1,316 M tons Coal (thermal)
Probable 107 M tons Coal (thermal)
Proven & Probable 1,423 M tons Coal (thermal)


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Dragline ....................... Subscription required 100 cu. yd ....................... Subscription required
Dragline ....................... Subscription required 135 cu. yd ....................... Subscription required
Dragline ....................... Subscription required 82 cu. yd ....................... Subscription required
Dragline ....................... Subscription required 72 cu. yd ....................... Subscription required
Drill (blasthole) ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required 55 cu. yd ....................... Subscription required
Loader ....................... Subscription required 70 cu. yd ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Scraper ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required 82 cu. yd ....................... Subscription required
Shovel ....................... Subscription required 80 cu. yd ....................... Subscription required
Shovel ....................... Subscription required 70 cu. yd ....................... Subscription required
Truck (dump) ....................... Subscription required 250 tons ....................... Subscription required
Truck (dump) ....................... Subscription required 400 tons ....................... Subscription required
Truck (dump) ....................... Subscription required 320 tons ....................... Subscription required
Truck (dump) ....................... Subscription required 360 tons ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
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

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Form 10-K 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Fact Sheet 2018
Form 10-K 2018
Fact Sheet 2017
Form 10-K 2017
Fact Sheet 2016
Form 10-K 2016
Fact Sheet 2015
Form 10-K 2015
Annual Report 2014
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