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United States
Cordero Rojo Mine

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

  Regional Office:
P.O. Box 1449
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
Mine Life18 years (as of Jan 1, 2017)


Owners

Source: p. 11
CompanyInterestOwnership
Navajo Transitional Energy Company, LLC 100 % Indirect
Cordero Mining LLC. (operator) 100 % Direct
The Cordero Rojo Mine is operated by the Cordero Mining LLC.

Deposit Type

  • Sedimentary


Summary:

The Cordero Rojo Mine extracts thermal coal from the Wyodak Seam, which ranges from approximately 55 to 70 feet in thickness.

General Geology and Coal Resources
Stratigraphic units include, in descending order recent (Quaternary age) alluvial and eolian deposits, the Eocene age Wasatch Formation (the overburden), and the Paleocene age Fort Union Formation (which contains the target coal seam).

Surficial deposits in the general analysis area include alluvial and eolian deposits and weathered Wasatch Formation. Alluvial deposits occupy the Belle Fourche River valley and the lower portions of tributary draws where they join the river.

The Eocene Wasatch Formation forms most of the overburden in the general analysis area. The boundary between the Wasatch Formation and the underlying Paleocene Fort Union Formation is not distinct. From a practical standpoint, the top of the mineable coal zone is considered as the contact between the two formations. The regional dip in this area is to the west; as a result, the overburden thickness is generally thinner to the east and increases to the west.

The Fort Union Formation is divided into three members: the Tongue River, the Lebo, and the Tullock, in descending order.

The mineable coal seams in the Powder River Basin are part of the Tongue River Member of the Fort Union. At the Cordero Rojo Mine there is one mineable coal seam. Locally, this coal zone is referred to as either the Wyodak or the Wyodak-Anderson. Up to five noncoal splits or partings occur within the seam, but they are typically local, discontinuous lenses of carbonaceous clay or shale that are less than one ft thick.

The Fort Union coal seams are subbituminous and are generally lowsulfur, low-ash coals. Typically, the coal being mined in the Powder River Basin has a higher heating value and lower sulfur content south of Gillette than north of Gillette.


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

Cordero began operations in 1976 and currently has a permitted mining capacity of 65 million tons per year in conjunction with the Caballo Rojo Loadout. Mining is carried out primarily by dragline operations, with truck/shovel utilized to move coal.

Coal is mined using conventional surface-mining methods and shipped from an onsite railroad loading facility to electric utilities and industrial customers in the west, midwest, and southern, United States.

The Cordero Rojo Mine uses a combination of dragline and truck shovel mining methods.

Surface mining typically involves the removal of topsoil and drilling and blasting the overburden with explosives. The overburden is then removed with draglines, trucks, shovels, and dozers. Trucks and shovels then remove the coal. The final step involves replacing the overburden and topsoil after the coal has been excavated, reestablishing vegetation into the natural habitat and making other changes designed to provide local community benefits.


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 required12,609,41316,393,56918,332,04622,871,97634,809,101
Heat ContentBTU/lb8,4408,3938,4218,425
Sulfur%0.290.30.3
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.


Reserves at December 31, 2017:

CategoryTonnage Commodity
Proven 246.5 M tons Coal (thermal)
Probable 52.5 M tons Coal (thermal)
Proven & Probable 299 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
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 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 2021
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Other 2018
Environmental Assessment 2017
Form 10-K 2017
Other 2017
Corporate Presentation 2016
Form 10-K 2016
Other 2016
Form 10-K 2015
Other 2015
Other 2014
Environmental Assessment 2007
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Aerial view:

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