Shrinkage StopingA popular mining method for narrow, steeply dipping veins, This orebody outcrops at surface and dips at 70°. It has a strike length of 2000m, a vertical depth of 500m and is, on average, 2.0m wide (thick). It is assumed the natural geological variability in width and direction precludes the use of long holes due to excessive dilution and poor recovery. |
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Sublevel Open Stoping (SLOS)A popular mining method for wider, steeply dipping veins, This orebody outcrops at surface and dips at 70°. It has a strike length of 2000m, a vertical depth of 500m and is 3.0m wide (thick). In this wider vein, dilution and recovery are now acceptable with long hole stoping. Long hole stoping is much more productive, and much cheaper, than shrinkage. |
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Room and Pillar MiningRoom and Pillar is used in most flat-dipping reserves which are thick enough to accommodate crawler-mounted and above all rubber-tyred equipment. It is ideally suited to sedimentary deposits such as coal and industrial minerals. It is also used in flat-dipping metalliferous deposits such as strata-bound lead/zinc. This reserve is horizontal, 420m deep and 3.0m thick. Boundaries are, as usual, variable, but extend to approximately 2.6 x 3.3km. |
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Man EngineThis consisted of timber rods with platforms which move up and down in the shaft, and fixed platforms at each extremity of movement. Miners traverse the often inclined shaft by stepping on and off moving platforms in the direction they need to go. Developed in the Hartz region in Germany, the technique arrived in Cornwall early in the 19th century. They proved to be generally safer, less arduous and quicker for miners to go to and from their place of work than the fixed ladders they replaced. Driven by water wheels or, most often, steam driven beam engines, they were replaced in the early 20th century by rope hoisting in vertical shafts. |
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BOOK SUMMARY
PREFACE
CONTENTS
FIGURES
MINE PLANNING ANIMATIONS
SHRINKAGE STOPING
SUBLEVEL OPEN STOPING (SLOS)
ROOM AND PILLAR MINING
MAN ENGINE
GALLERY
STRIPPING RATIO
TYPES OF ORE RESERVE
ACCESS FROM SURFACE
SHAFT PLANNING
DEVELOPMENT PLANNING
SKIP OR "CAR AND CAGE" HOISTING
ROPE HAULAGE
TRACKLESS MINING AND RAMPS (DECLINES)
SUBLEVEL OPEN STOPING (SLOS)
To purchase a copy of my book, please email me at:- jim@jdowling.com
