Belle Ayr Mine


Foundation Coal

Mine Contact

Tom J. Lien (VP and GM), (307) 687-3460, 2273 Bishop Road, Gillette, WY 82718-9356


18 miles southeast of Gillette, Wyoming in Campbell County

Rail Loading Point

Belle Ayr Mine, Wyoming

Background on Mine

Belle Ayr is the oldest non-captive mine in the PRB. Coal production began in 1972, and the mine has produced and shipped over 325 million tons to date.

Mine Type

Open pit/Truck/Shovel

Recoverable Reserves

Approximately 500 million tons remaining

Annual Production (1996)

19,970,300 tons

Current Annual Production Capacity

23 million tons

Rail Loading Point Storage Capacity

61,000 tons

Loadout Description and/or Configuration

Batch weigh system with silo gravity feed back-up.

Weighing System

Batch weigh system and coupled-in-motion track scales.

System Used to Assure Maximum Loading Per Car

Batch system

Loading Rate per Hour

7,000 tons

Storage Recharge Rate

6,000 tons per hour

Load Track Configuration and Capacity

Loop track, two train capacity

Loading Mode

Load in motion

Maximum Cars Per Train

135+ cars

Washing Capability


Coal Specifications

Sub-bituminous coal, 8,550 Btu/lb., 0.31% Sulphur

proximate analysis (%) 
Moisture 29. 9
Ash 4.6
Volatile Matter 31.5
Fixed Carbon 34.7
Fusion Temperature of ash (°F) 
Softening (H=W) 2,170
other characteristics
Hardgrove Grindability Index 57