coal surface mining depths and bed thickness

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Coal Resources Available for Development - A Methodology ...

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.

USGS OFR 89-362 - Restrictions Used: Coal Resources ...

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 ...

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.

USGS OFR 89-362 - Restrictions Used: Coal Resources ...

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 ...

Available Information from the National Mine Map ... - OSMRE

Available Information from the National Mine Map Repository. The NMMR contains digital and microfilm maps of surface and underground coal, metal, and non-metal mines throughout the United States. Some of the information that can be found in the repository includes: Mine and company names. Underground mine plans including mains, rooms, and pillars.

TDT National Mine Map Repository (NMMR)

Geological information including bed name, bed thickness, depth, drill-hole data, cross-sections, elevation contours, structures, and outcrops. Geographical data including abandoned railroad lines and stations, coal towns, surface facilities, roads, ponds, streams, and property survey points.

Geology of the Mary Lee Group of Coalbeds, Black Warrior ...

The presence of faults can severely affect underground coal mining opera- tions as well as surface mining. The faults in the Warrior basin range up to 6 miles in length. The maximum vertical displacement reported by Sernrnes (19) - is about 200 feet; however, displacement of more than 100 feet is rare. A

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

Coal mining - Wikipedia

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.

Underground mining of thick coal seams - ScienceDirect

Nov 01, 2015 · The amount of maximum surface subsidence (S ub) for single seam mining cases in Indian coal fields is given as: (3) S ub = 0.33 he 1 + 1.1 tan h (1.4 (x-1.8)) where h is working height, e is extraction in percent, x = L H / NEW, L is width and H is depth of cover of the panel.

WV chapter 5 final

(See Appendix 1-3). Readily distinguishable lithologic units, or marker beds, such as named coal seams or rock units, should be indicated along with all aquifer units. For surface mining applications, the relative position of all acid- or toxic-forming zones, and all zones proposed for use as topsoil substitutes, must be shown. 3. Fence Diagrams

(PDF) Surface Mining | abdelaziz El Shinawi -

In South Africa, Grootegeluk Colliery is a typical example of terrace type of mining. Currently, 11 benches are mined, 6 of overburden waste and 5 of coal. A dragline cannot be used due to the depth of the coal and width of the pit, but later on in the life of the mine

Mine Index 0857 Peabody Coal Company, River King Surface ...

Peabody Coal Company Mine Name: River King Surface Mine Start Date: 1957 End Date: 1986 ... Thickness (ft) Seam Depth Min Max Ave Mining Method; Herrin 58-78 other 6.2-7.0 Surface Geological Problems Reported. The upper 6 inches of the Herrin Coal contained flat coal balls in one area. Some difficulties encountered in surface mining Pit No. 3 ...


named coal beds but due to the depth below existing surface contours and streambeds are not ... With its thickness and generally level orientation, the ... BULL GAP MINE, P-3960. technology developed, surface coal mining has been conducted at Raccoon Mountain beginning in the mid-1950's and continued on a periodic basis up to the early 1990's ...

OSMRE AR Tennessee

Read more about the Tennessee Coal Mining Industry. Tennessee’s recoverable coal reserves of 0.5 billion short tons exist in bituminous coal beds that range from less than 28 inches to 42 inches in thickness at depths of up to 1,000 feet. The primary use of Tennessee coal is

Coal Info - Coal Sales Online

Acres = the number of acres underlain by a coal bed. Coal thickness = the average coal thickness in decimal feet for that area underlain by coal. For example: If you have 5 acres of property underlain by a coal bed, and the coal bed thickness is 2.5 ft. then, 5 x 2.5 x 1,800=22,500 tons of coal

KGS--MRS 7--Coal Surface Mining and Reclamation ...

Oct 25, 2018 · Strata between the Rowe coal and the overlying Dry Wood coal consist mostly of shale and underclay beds, ranging from 6 to 9 feet in thickness. The Dry Wood coal ranges in thickness from 0.25 to 1.25 feet. Above the Dry Wood coal is a dark-gray shale several feet thick, and a thin coal bed locally known as the "pilot coal."

Coal Resources & Reserves - Wyoming State Geological Survey

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 ...

What is the NMMR? - National Mine Map Repository (NMMR ...

Dec 11, 2011 · and 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,


ranging in thickness from 17’ to 65’ with good neutralization potential and lower sulfur. In drill hole 816c the zone of sandy shale (160.0’-162.9’) immediately above the Pratt coal seam had a sulfur content of 1.586 with an ABA of 33.56 and a net NP tons of (- -12,457).

coal - Michigan State University

In the center of the coal-bearing area (in Midland County) coal is found at depths of about 800 ft. Source: Unknown The seams vary in thickness, but the major coal-producing strata are approximately 1 m thick. The largest deposits found (and the most coal mined in the past) were in the Saginaw Valley.

Commonly used mining techniques to extract coal | ICSC

Jan 25, 2018 · As mining of coal depends on the depth and quality of the coal seams, different techniques are used to dig the deposits. Surface mining and deep underground mining are the two main methods of mining coal. Depth, density, and thickness of the coal seam are the factors that are taken into account while selecting the mining method for coal extraction.

History of Illinois Coal Mines - Coal and Coal Mining by ...

Coal beds which are at or near the surface along the margins of the coal basin lie at considerable depths in the middle of the basin. For example, the relatively well-known No. 6 coal, which is strip-mined along its outcrop in southern Illinois, lies at depths exceeding 1,200 feet in parts of Jasper County.

KGS--Coal Surface Mining and Reclamation, SE Kansas--Geology

The lowermost unit shown on the composite section is the Rowe coal, which ranges in thickness from 14 to 18 inches. The coal is banded and contains pyrite and gypsum along cleats and bedding planes. Strata beneath the Rowe coal, as interpreted from the deepest core (core C-4), include at least 8 feet of dark-gray shale, as well as a thin siltstone.

Mining 101 - West Virginia Coal Association

Aug 30, 2012 · Mining 101. August 30, 2012. The Basics. There are four basic types of coal: Lignite, subbituminous, bituminous and anthracite. Lignite is the lowest rank of coal with the lowest energy content. Lignite is crumbly and has high moisture content. Lignite accounts for about 7% of U.S. coal

Final Report - Effects of Longwall Mining

Nov 08, 2002 · 10. Areas (polygons) surrounding the longwall panels but within existing mine subsidence permits were analyzed to identify basic characteristics: depth to coal, density of surface development, public sewer and water delivery areas, road accessibility, and relationship to abandoned mining. 11.

Land and natural resource information and some potential ...

Campbell County, along the east margin of the Powder River Basin in northeastern Wyoming, contains more coal than any other county in the United States. The principal deposit is the Wyodak-Anderson coal bed. The bed is 50-100 feet (15-30 meters) thick over large areas, lies less than 200 feet (60 meters) deep in a north-south trending strip nearly 100 miles (161 kilometers) long and 2-3 miles ...

Surface Coal Mining in the Northern Great Plains of the ...

Over the last few years, the estimates of recoverable coal in the West have risen, primarily as the result of data obtained from increased exploration *The feasibility of surface mining is related to the thickness, quality and depth of a coal bed. Thin coal beds are economical to mine if they lie near the surface; the thicker the coal bed, the ...


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 ...

Status of Mineral Resource Information for the Northern ...

Coal beds underlie the entire Northern Chey­ enne Reservation; much of the coal is in beds that are at too great a depth for surface mining. How­ ever, of an estimated 23 billion tons of coal under­ lying the reservation, it is estimated that surface mining may be applicable for about 5-6 billion tons. BIA Administrative Report 3 (1975) 1