Download Methods of Working Coal and Metal Mines. Planning and by Seth D. Woodruff PDF

By Seth D. Woodruff

Equipment of operating Coal and steel Mines, quantity three discusses the extraction of mineral deposits, which contains the riding of improvement openings, from the skin or a important shaft, to the “block out” parts of the deposit.
This e-book is split into 3 elements. half A describes the coal mining tools, which come with pillar mining structures and long-wall mining. Economics of coal face mechanization is additionally mentioned. partially B, the type of stoping structures, that's made from pillar-supported stopes, bushes and fill supported stopes, and cutting or caving structures, is elaborated. This half additionally emphasizes the mining bedded metalliferous ores, in addition to the prices and different elements affecting the alternative of mining structures. half C deliberates the outside mining equipment, which encompass strip mining of coal, open-pit mining, and balance of pit slopes.
This e-book is meant for mining engineers, yet can be valuable to scholars and researchers engaging in paintings at the program of extracting and processing minerals.

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Props and cribs are crushed. The roof may fracture and the floor heave at the face. A rigid island creates an abutment zone between island and face which must sustain abutment pressures proportional to its incompressibility. If the island sup- i i ι1 U uilUllhuuUullhiiUn Pillar Props il il (0 ill J l i u i u u u * Props Crib Millll * Pillar F I G . 2 4 . (a) Vertical pressure distribution w h e n y i e l d i n g s u p p o r t s are u s e d with c o m p l e t e c a v i n g o f r o o f b e h i n d the face.

In exceptionally soft or friable coal seams, such as many of those in G e r m a n y , the coal may be won by breaking it from the face by means of hand-held pneumatic picks. The coal, after it is broken down, is then loaded onto conveyors which are located parallel to and just behind the long-wall face. Mechanized Cyclic Mining Long-wall mining operations in which coal is first cut and broken down from the face and then loaded onto conveyors are cyclic in nature. Usually only one shift in each 24 hr can be devoted to loading of coal.

T o t a l s L o n g - w a l l M e t h o d s (1 t o 15)** MINING COALFACE OUTPUT < 39 SYSTEMS L )9 with c o m p a r a t i v e statistics for 1960) Pithead c o a l l o a d e d during p e r i o d 1961 tons 1960 Man-shifts / t h o u s a n d tons pithead ( M S T face) (including shotfirers) 1961 Average advance per 2 4 hr 1961 1960 ft tons in. Average advance per m a c h i n e shift 1960 1961 1960 ft ft ft in. in. in. 6,141,617 3,223,601 112 118 5 3 4 9 2 6 2 6 31,897,968 26,649,282 152 146 4 6 4 4 2 8 2 8 38,039,585 29,872,883 146 143 4 8 4 4 2 7 2 8 7 5 2 2 8 2 8 6,195,979 2,742,380 100 106 5 16,760,958 12,362,763 132 130 5 1 5 0 2 9 2 9 22,956,937 15,105,143 123 125 5 3 5 0 2 9 2 9 255,201 101,253 156 166 3 6 3 5 2 3 2 0 10,365,626 6,595,050 180 181 3 8 3 7 2 10 2 11 10,620,827 6,696,303 180 181 3 8 3 7 2 10 2 10 5 1 10 1 10 148,548 186,100 184 178 4 4 3 3,063,029 2,459,239 135 138 4 1 4 0 2 3 2 4 3,211,577 2,645,339 137 141 4 1 4 0 2 3 2 3 415,326 493,914 297 281 3 3 3 4 2 9 3 0 280,018 276,618 102 110 3 10 4 9 3 10 4 9 216,976 298,943 212 218 3 7 3 2 2 2 2 7 14,744,724 10,411,117 173 175 3,025,596 3,887,069 237 227 3 10 3 11 3 2 3 6 640,271 785,285 177 183 3 3 3 2 3 0 2 7 3,665,867 4,672,354 226 219 3 9 3 10 3 2 3 5 7,760,624 9,501,426 144 140 4 7 4 8 2 11 2 10 3 3,953,933 3,777,018 197 206 2,357,052 2,418,476 197 180 4 0 3 11 3 3 3 1,048,915 906,284 119 99 4 7 4 7 4 0 4 1 782,399 768,047 266 251 4 0 3 10 3 5 3 3 386,290 158,833 128 117 6 1 3 1 2 10 207,573 157 158 4 11 5 4 5 577,665 9 2 8 2 9 963,955 366,406 145 140 5 4 5 0 2 10 2 9 22,228 2799 240 232 2 1 1 10 2 0 1 10 281,840 186,935 115 139 4 3 3 9 2 3 2 3 304,068 189,734 124 140 3 10 3 7 2 2 2 2 286,389 585,905 170 167 3 4 3 10 1 10 2 1 225,746 248,454 168 171 4 10 4 7 3 11 4 0 361,185 92,398 138 122 4 0 3 10 2 8 2 4 684,686 202 206 3 11 3 9 3 10 2 9 3 2 9 2 10 1,080,229 98,531,608 79,600,331 152 153 4 5 4 COAL MINING METHODS 40 TABLE Type of machine 8.

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