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United States
Antelope Mine

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 Location:
104 km NE from Casper, Wyoming, United States

  Regional Office:
P.O. Box 3008
Gillette
Wyoming, United States
82717
Phone  ...  Subscription required
Fax(307)-464-2588
WebsiteWeb
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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
Mine Life14.2 years (as of Jan 1, 2020)
With coal sales declining in the COVID-19 pandemic, NTEC laid off 80 miners at the Antelope Mine in Wyoming. These workers were furloughed in May. In April, 57 employees at the Antelope mine were laid off. In May 93 hourly workers were furloughed and eight salaried employees were laid off.


Owners

Source: p. 9
CompanyInterestOwnership
Antelope Coal LLC. (operator) 100 % Direct
Navajo Transitional Energy Company, LLC 100 % Indirect
Antelope Coal LLC., a subsidiary of Navajo Transitional Energy Corp (NTEC), operates the Antelope Mine.

Deposit Type

  • Sedimentary


Summary:

The mine extracts thermal coal from the Anderson and Canyon Seams, with up to 44 and 36 feet, respectively, in thickness.

General Geology and Coal Resources
Stratigraphic units include, in descending order, recent (Holocene age) alluvial and eolian deposits, the Eocene age Wasatch Formation (the overburden), and the Paleocene age Fort Union Formation (which contains the target coal beds). [Dec 2008, Final Environmental Impact Statement, p. 118-120]

Surficial deposits within the general analysis area include alluvial and eolian deposits, clinker, and weathered Wasatch and Fort Union Formations. Although clinker is present in the general analysis area, the tract has no appreciable amounts of clinker. There are thin alluvial deposits along ephemeral streams. These alluvial deposits typically consist primarily of poorly to well-sorted, irregularly bedded to laminated, unconsolidated sand, silt, and clay with minor intervals of fine gravel. The valley floors of Horse Creek, Spring Creek and Antelope Creek contain appreciable amounts of alluvium both in width and depth. The alluvial deposits in Horse Creek, Spring Creek and Antelope Creek contain much more coarse-grained material (sands and gravels) than the ephemeral tributaries that drain most of the general analysis area. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The Eocene Wasatch Formation forms most of the overburden overlying the mineable coal seams in the general analysis area. It consists of interbedded lenticular sandstones, siltstones, shales, and thin discontinuous coals. There is no distinct boundary between the Wasatch Formation and the underlying Paleocene Fort Union Formation. From a practical standpoint, however, the top of the mineable coal zone is considered as the contact between the two formations. Overburden thickness averages 260 feet in the Bureau of Land Management (BLM) study area and ranges from around 20 ft to more than 460 ft. The overburden is relatively thin in the vicinity of the major channels within the tract and increases in thickness away from the channel bottoms. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The Fort Union Formation consists primarily of shales, mudstones, siltstones, lenticular sandstones, and coal. It is divided into three members: Tongue River (which contains the mineable coal seams), Lebo, and Tullock, in descending order. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The Tongue River Member of the Fort Union Formation consists of interbedded claystone, silty shale, carbonaceous shale, and coal, with lesser amounts of finegrained sandstone and siltstone. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The nomenclature of the mineable coal seams in the Fort Union Formation varies from mine operator to mine operator. The U.S. Geological Survey (Flores et al. 1999) refers to the thick mineable coals in the Gillette coal field as the WyodakAnderson coal zone of the Tongue River Member of the Fort Union Formation. Locally these beds are referred to as Wyodak, Wyodak-Anderson, Anderson, and Canyon. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

There are four mineable seams in the West Antelope II Lease By Application tract (referred to by the operator as the Anderson, Lower Anderson, Canyon/Upper Canyon, and Lower Canyon). The total coal thickness ranges from 15 to 86 ft. Interburden between the coal seams varies from 5 to around 115 ft. The total overburden thickness (including interburden where present) ranges from about 20 ft to approximately 550 ft. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The Fort Union coal seams are subbituminous and are generally low-sulfur, lowash coals. Typically, the coal being mined has a higher heating value and lower sulfur content south of Gillette than north of Gillette. The ash content in the coal seams is expected to vary from 3.5 to 8 percent, the sulfur content from 0.15 to 0.4 percent, and the moisture content from 23 to 28 percent. [Dec 2008, Final Environmental Impact Statement, p. 118-120]

The Lebo and Tullock Members of the Fort Union Formation underlie the Tongue River Member. They consist primarily of sandstone, siltstone, mudstone, shale, and coal. In general, the Tullock Member contains more sand than the Lebo Shale Member. [Dec 2008, Final Environmental Impact Statement, p. 118-120]


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The Antelope Mine is located in the southern end of the PRB approximately 60 miles south of Gillette, Wyoming. The mine extracts thermal coal from the Anderson and Canyon Seams, with up to 44 and 36 feet, respectively, in thickness. Significant areas of unleased coal north and west of the mine are available for nomination by us or other mining operations or persons. Based on the average sulfur content of 0.50 lbs SO2/mmBtu, the reserves at our Antelope Mine are considered to be compliance coal under the Clean Air Act, and this coal is some of the lowest sulfur coal produced in the PRB.

Coal at the Antelope Mine is mined using conventional surface-mining methods and shipped from an onsite railroad loading facility to electric utilities and industrial customers in the U.S. Antelope Mine uses a truck and shovel and dragline mining method.


Crushing and Grinding


Processing


Summary:

The coal from mine is crushed and shipped directly from mine to the customer. Typically, no other preparation is needed for a saleable product. However, coals of various sulfur and ash contents can be mixed or “blended” to meet the specific combustion and environmental needs of customers.


Production:

CommodityUnits2020201920182017201620152014
Coal (thermal) tons  ......  Subscription required  ......  Subscription required23,155,74228,503,50429,793,25735,181,05933,646,960
Heat ContentBTU/lb8,8678,8648,8518,875
Sulfur%0.240.230.24
All production numbers are expressed as ROM coal.
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Reserves at May 1, 2020:

CategoryTonnage Commodity
Proven & Probable 424.1 M tons Coal (thermal)


Heavy Mobile Equipment as of December 31, 2017:
HME TypeModelQuantity
Dozer ....................... Subscription required
Dragline ....................... Subscription required
Drill ....................... Subscription required
Excavator ....................... Subscription required
Shovel ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
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
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Other 2018
Form 10-K 2017
Other 2017
Form 10-K 2016
Other 2016
Corporate Presentation 2015
Form 10-K 2015
Other 2015
Other 2014
Environmental Assessment 2008
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Aerial view:

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