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Coal Resources Available for Development

However, depth and thickness of a coal bed may be considered as technological restrictions to surface as well as underground mining. Technological restrictions are based on the limitations of mining safety, costs, and equipment. The following are some technological factors that can restrict mining. Coal-Bed Depth and Thickness.

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Coal and Coalbed Methane

The commercial coal belt contains coal beds ≥ 10 in. thick that are mineable by surface methods at depths 100 ft and coal beds ≥ 14 in. thick that are mineable by surface and underground methods. The noncommercial coal-bearing region has limited information on coal thickness and quality or contains coals that are too thin, of low quality

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USGS OFR 89

Although surface-mining depths vary with changes in thickness and character of coal beds and with changes in the lithology of the overburden, 200 feet was assumed to be the maximum possible depth for surface mining in each of the four study areas. A 200-ft overburden thickness line was derived by subtracting the elevations at the tops of the

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Coal Resources Reserves

However, coal is usually mined safely at depths less than 3,500 feet; any deeper and the weight of the overlying rock could collapse. Coal reserves are the portion of the total resource that is economically viable to mine. Coals are economically mineable depending on their bed thickness and burial depth, the continuity of the coal seam, as well

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Availability of Coal Resources for Mining in Illinois

10 Thickness of the Herrin Coal, Shawneetown Quadrangle 16 11 Depth of the Herrin Coal, Shawneetown Quadrangle 17 12 Stripping ratio of the Herrin Coal, Shawneetown Quadrangle 18 13 Availability of the Herrin Coal for surface mining, Shawneetown Quadrangle 20 14 Thickness of the Springfield Coal, Shawneetown Quadrangle 22

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Coal Surface Mining Depths And Bed Thickness

Coal-bed thickness categories used in this report compared to those used in the Coal Resource Classication System .. will likely preclude mining by surface (open-pit) methods . coal in the study area is at depths less than 100 feet, which is.

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Surface Subsidence Prediction Method for Coal Mines with

Thus, under the UTHS mining condition in the Tingnan Coal Mine, the required dimension (1350 m) in the strike and dip directions in the gob region when the surface reaches sufficient mining is much larger than the empirical value (1.2–1.4 times the seam mining depth of 657–766 m), which verifies the actual measurement results in Section 2.1.

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Coal mining

The choice of mining method depends primarily on depth, density, overburden, and thickness of the coal seam; seams relatively close to the surface, at depths less than approximately 55 m (180 ft), are usually surface mined.

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coal mining

Choosing a mining method. The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many technological, economic, and social factors.

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GEOLOGIC REQUIREMENTS FOR EXPLOITABLE FOSSIL FUEL

resources that are based on coal bed thickness related to coal rank and the depth of the overburden for both surface mining and underground mining methods. Overburden is non-coal material that lies above the coal and must be stripped away to extract the coal using surface mining methods or to drive a mine shaft through to extract the coal by

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What is the NMMR?

Dec 11, 2011and mining information from both surface and underground mines throughout the United States. Information contained in the NMMR archive includes: 1) coal, metal, and non-metal mine maps, 2) geological information (bed name, bed thickness, depths, drill-hole data,

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Characterization of Indiana's Coal Resource: Availability

maps for major coal beds, ash characteristics, summaries of 35 trace elements Coal removed by surface mining Coal removed by deep mining Coal too thin for surface mining to create the Danville coal thickness and depth maps (confidential data are not shown, after Conolly, 2001).

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Coal Seam

In general, the higher the rank of coal and the greater the depth of coal, the higher is the coal's gas content. Actual gas contents of various coal seams to mineable depths of 4000 ft (1200 m) indicate a range of 35–875 ft 3 /t (1–25 m 3 /t). Methane is the major component of coal bed methane (CBM), accounting for 80–95%.

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Availability of Coal Resources for Mining in Illinois

FACTORS AFFECTING THE AVAILABILITY OF COAL 4 Depth of Seam 4 Thickness of Seam 6 Stripping Ratio 6 4 Availability of the Colchester Coal for surface mining in the Augusta and Roodhouse The presence of relatively thick limestone beds in the overburden of the Herrin Coal permits underground mining of these resources at much shallower

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