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United States
Leer Mine

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 Location:
32.2 km S from Morgantown, West Virginia, United States

  Address:
1200 Tygart Drive
Grafton
West Virginia, United States
26354
Phone  ...  Subscription required
WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Coal (metallurgical)
Mining Method
  • Longwall
  • Continuous
  • Room-and-pillar
Processing
  • Wash plant
  • Dense media separation
Mine Life2035


Owners

Source:
CompanyInterestOwnership
Arch Resources, Inc. 100 % Indirect
Arch Coal, Inc. Tygart Valley, LLC is an indirect subsidiary of Arch Coal, Inc.

Deposit Type

  • Sedimentary


Summary:


Mining Methods

  • Longwall
  • Continuous
  • Room-and-pillar


Summary:

Longwall mining involves using a mechanical shearer to extract coal from long rectangular blocks of medium to thick seams. Ultimate seam recovery using longwall mining techniques can exceed 75%. In longwall mining, continuous miners are used to develop access to these long rectangular coal blocks. Hydraulically powered supports temporarily hold up the roof of the mine while a rotating drum mechanically advances across the face of the coal seam, cutting the coal from the face. Chain conveyors then move the loosened coal to an underground mine conveyor system for delivery to the surface. Once coal is extracted from an area, the roof is allowed to collapse in a controlled fashion.

Room and pillar mining is effective for small blocks of thin coal seams. In room and pillar mining, a network of rooms is cut into the coal seam, leaving a series of pillars of coal to support the roof of the mine. Continuous miners are used to cut the coal and shuttle cars are used to transport the coal to a conveyor belt for further transportation to the surface. The pillars generated as part of this mining method can constitute up to 40% of the total coal in a seam. Higher seam recovery rates can be achieved if retreat mining is used. In retreat mining, coal is mined from the pillars as workers retreat. As retreat mining occurs, the roof is allowed to collapse in a controlled fashion.


Crushing and Grinding


Processing

  • Wash plant
  • Dense media separation

Source: Subscription required

Summary:

All the production is processed through a 1,400 ton-per-hour preparation plant and loaded on the CSX railroad. A 15,000-ton train can be loaded in less than four hours.


Production:

CommodityUnits201920182017201620152014
Coal (metallurgical) M tons  ......  Subscription required3.53.24.12.92.7
All production numbers are expressed as clean coal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20152014
Annual production capacity 3.5 M tons of clean coal3.5 M tons of clean coal

Reserves at December 31, 2019:

CategoryTonnage Commodity
Proven & Probable 48.3 M tons Coal (metallurgical)


Heavy Mobile Equipment as of December 31, 2016:
HME Type
Continuous miner

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2020
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Form 10-K 2017
Form 10-K 2016
Form 10-K 2015
Form 10-K 2014
Subscription required - Subscription is required.

Aerial view:

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