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Coal Recovery from Bituminous Coal Surface Mines in the Eastern United States, a Survey.

Authors
Secor-ES; Larwood-GM; Gupta-AB; Lees-AS
Source
NTIS: PB 269 914 :14 pages
Link
NIOSHTIC No.
10007919
Abstract
The federal Bureau of Mines conducted a field survey of 153 bituminous coal strip and auger mines to estimate coal recovery from surface mines in the Eastern United States. Recovery was calculated from field data by measuring coal losses resulting from mining coal and leaving barriers. Mean total recovery for strip mining in states east of the Mississippi River was 83.0 percent and ranged from 72.3 percent for Tennessee to 91.3 percent for Maryland. Mining losses and barrier losses were 10.0 and 7.7 percent, with standard deviations of 4.8 and 10.4 percent, respectively, indicating that barrier losses, although less than mining losses, were more variable. Mean total coal recovery varied only slightly for the regions studied: 82.7 percent for appalachia and 84.3 For the Midwest. Total recovery grouped by mining method--contour, area, and mountaintop removal--was 79.8, 84.7, and 85.3 percent respectively. Mean auger recovery was 35.9 percent; of the total average loss of 64.1 percent, over one-half resulted from design limitations, while the remainder was attributed to operating losses. The wide recovery range at individual mines indicates the variability of the eastern surface coal mining industry. Because of this, care should be exercised in applying the results of this report to reserve estimates other than those of a general nature.
Publication Date
19770101
Document Type
IH; Information Circular;
Fiscal Year
1977
NTIS Accession No.
PB-269914
NTIS Price
A03
Identifying No.
IC 8738
Source Name
NTIS: PB 269 914
State
MD; MS; TN;
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