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 consists of the using of improvement openings, from the outside or a significant shaft, to the “block out” parts of the deposit.
This booklet is split into 3 components. half A describes the coal mining equipment, which come with pillar mining platforms and long-wall mining. Economics of coal face mechanization can also be mentioned. partly B, the category of stoping structures, that is constructed 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 components affecting the alternative of mining platforms. half C deliberates the skin mining equipment, which include strip mining of coal, open-pit mining, and balance of pit slopes.
This ebook is meant for mining engineers, yet is additionally necessary to scholars and researchers undertaking paintings at the program of extracting and processing minerals.

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7696. ( 5) A s in c o n v e n t i o n a l , h a n d - l o a d i n g , a n d mechanical m i n i n g m e t h o d s , effective r o o f c o n t r o l is m o s t important. A m e t h o d o f r o o f support must be provided that will insure safety t o workm e n a n d e q u i p m e n t a n d a l l o w the c o n t i n u o u s - m i n i n g m a c h i n e t o operate without u n d u e delay. R o o f b o l t i n g w a s u s e d t o a d v a n t a g e in s o m e m i n e s ; in other m i n e s , w o o d a n d steel crossbars were set o n steel j a c k s or w o o d p o s t s ; a n d other m i n e roofs required o n l y w o o d or steel posts with w o o d c a p pieces.

The Anderton Shearer-loader is also a popular machine for continuous mining on long-walls and these machines produced about 38 million tons of coal in Great Britain in 1961. The machine is equipped with a toothed d r u m which rotates about an axis which is perpendicular to the coal face and rips coal from the face. The Joy long-wall Buttock Miner is a crawler-mounted machine which is equipped with twin trepanners to remove a web of coal about 5 ft wide from the face. Coal plows or planers are simple slide-mounted devices equipped with wedge blades and designed to be pulled along the coal face and to peel from the face a layer of coal a few inches thick.

Recovery of props or cribs may be difficult or impossible, and re-establishment of the mining and support cycle is difficult. If extraction of a seam with full caving of the roof is contemplated the seam should be mined out completely as the extraction line progresses. If a stump must be left at the outer end of each pillar as it is mined then the stump should be small enough to crush easily under the subsiding roof after extraction of the pillar is completed. If strong stumps must be left for temporary support they should be blasted out after mining is completed on each pillar.

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