Jacobs Ranch

Owner

Arch Coal Inc.

Mine Contact

Ron Crispin (307) 464-5501

Location

50 miles southeast of Gillette, Wyoming

Rail Loading Point

Jacobs Junction, Wyoming

Background on Mine

Coal production at Jacobs Ranch mine began in 1978. By the end of 1996 over 283 million tons had been mined. Approximately 3,400 acres of federally-owned sub-bituminous coal are under lease. The coal appears in three seams: the Upper Wyodak, Middle Wyodak and Lower Wyodak. A shovel-truck method is used to mine the coal. The coal preparation plant is a single-stage (primary-secondary) crushing facility with storage for unit train loadout in seven silos. Coal sampling and analysis is performed in accordance with ASTM standards, with the laboratory run by the independent testing firm of Standard Laboratories, Inc. Quality assurance is maintained with a layer-loading system designed to ensure that each car's coal quality will meet customer specifications. The mine has the capability for sodium addition, and can apply side release agents and dust suppression chemicals as well.

Mine Type

Surface

Recoverable Reserves

250 million tons (as of June 1997)

Current Annual Production Capacity

35 million tons

Loadout Description and/or Configuration

A high-volume automated layer-loading system using multiple silos for blending to maintain uniform coal quality.

Weighing System

Coupled-in-motion axle weighing scales augmented by a top-loading system.

System Used to Assure Maximum Loading Per Car

Precision loading is capable of loading each car to a maximum gross allowable weight within 500 pounds.

Loading Rate per Hour

11,000 tons

Load Track Configuration and Capacity

Dual railroad track loops, with capability to load two trains simultaneously.

Maximum Cars Per Train

140 cars

Coal Specifications

Sub-bituminous coal, 8,686 Btu/lb., 0.430% Sulphur

Proximate Analysis (%) (5/19/97)
  Est. As Received Standard Deviation
Moisture 27.930 0.690
Ash 5.570 0.600
Volatile Matter 32.551 0.520
Fixed Carbon 33.519 0.620
Btu/lb 8,686 112
Sulphur 0.430 0.110
Ultimate Analysis (%)
  As Received Standard Deviation
Moisture 27.930 0.690
Ash 5.570 0.600
Carbon 49.413 0.940
Hydrogen 3.588 0.130
Nitrogen 0.618 0.100
Sulphur 0.430 0.110
Oxygen 12.443 0.350
Chlorine 0.007 0.000
Mineral Analysis of Ash
  As Received Standard Deviation
Phosphorous Pentoxide 0.869 0.220
Silicon Dioxide 28.630 2.770
Ferric Oxide 6.643 0.650
Aluminum Oxide 15.797 1.160
Titanium Dioxide 1.263 0.150
Calcium Oxide 22.591 1.870
Magnesium Oxide 3.245 0.420
Potassium Oxide 0.370 0.100
Sodium Oxide 1.610 0.170
Sulphur Trioxide 15.210 1.860
Undetermined 3.771 1.710
forms of sulphur
  As Received Standard Deviation
Sulfate 0.010 0.010
Pyritic 0.067 0.050
Organic 0.353 0.130
Fusion Temperature of Ash (°F)
    Oxidizing   Standard Deviation   Reducing   Standard Deviation
Initial   2,254   21   2,105   21
Softening   2,278   25   2,141   25
Hemispherical   2,295   40   2,169   40
Fluid   2,346   42   2,203   42
Other characteristics
    Standard Deviation
Equilibrium Moisture 24.625 1.030
Hardgrove Grindability Index 59 3.740
At % Moisture 18 4
Base to Acid Ratio 0.75  
Fe2O3 to CaO 0.29  
SiO2 to Al2O3 1.812