Contamination versus recovery rate in multi-seam lignite mining

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Prepr., Soc. Min. Eng. AIME; (United States)

OSTI ID:7127379

Heistermann, E C

The Falkirk Mining Company, a wholly owned subsidiary of The North American Coal Corporation, is located 80 kilometers (50 miles) north of Bismarck, North Dakota. The coal at these mines is present in two seams, the upper, designated the A seam, and the lower, designated the B seam. Over much of the field, the A seam is split with a parting of from 8 centimeters to 3.7 meters (3 inches to 12 feet) in thickness. In areas where the A seam is split, the upper split has been designated the A-1 and the lower, the A-2 seam. The A seam is separated from the lower lying B seam by an interburden of from 0.6 to 12 meters (2 feet to 40 feet) in thickness. The A-1 seam is 1.2 to 2.1 meters (4 to 7 feet) in thickness, the A-2 seam is 0.9 to 1.5 meters (3 to 5 feet) thick, and the B seam is 0.3 to 1.2 meters (1 to 4 feet) thick. Suitable plant growth material is removed to a depth of 1.5 meters (5 feet) and stockpiled for later replacement. Regrading is accomplished utilizing bulldozers to reshape the land to its approximate original contour. Overburden is removed with two Marion 8750 80.3 cubic meter (105 cubic yard) draglines working in separate pits. These machines are equipped with 106.7 meter (350 foot) booms, giving them a dump radius of 100 meters (328 feet). The overburden requires no preparation prior to removal. Highwall angles are kept at 1 radian (60/sup 0/), or slightly less, and spoil angles vary from 0.5 to 0.6 radians (30/sup 0/ to 35/sup 0/).

• Research Organization: The Falkirk Mining Company, Underwood, ND
• OSTI ID: 7127379
• Journal Information: Prepr., Soc. Min. Eng. AIME; (United States), Journal Name: Prepr., Soc. Min. Eng. AIME; (United States) Vol. 82-385; ISSN PMAID
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
BELT CONVEYORS
COAL DEPOSITS
COAL MINES
COAL SEAMS
CONVEYORS
DIMENSIONS
DRAGLINES
EARTHMOVING EQUIPMENT
EQUIPMENT
FEDERAL REGION VIII
GEOLOGIC DEPOSITS
GEOLOGY
HAULAGE EQUIPMENT
MATERIALS HANDLING EQUIPMENT
MINERAL RESOURCES
MINES
MINING
NORTH AMERICA
NORTH DAKOTA
RESOURCES
SITE PREPARATION
SURFACE MINING
THICKNESS
UNDERGROUND FACILITIES
USA