mechanised continuous retreat mining method cut

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Longitudinal longhole retreat QueensMineDesignWiki

Longitudinal longhole retreat is a branch of the generic mining method known as sublevel stoping. For longitudinal retreat the long axis of the stope is along or parallel to the strike of the orebody. It may also be referred to as bench stoping or sublevel benching. Three variations of this mining method are avoca eureka and creeping cone

Developments Made for Mechanised Extraction of LockedUp Coal

Bord and Pillar method of underground mining has been used extensively to develop Indian coal seams into pillars and galleries. This results in only 2030 recovery of coal and rest coal remain locked up in developed pillars. Indian coalfields are famous in the world for its uniqueness and complexity of the geomining conditions which makes the extraction of the lockedup coal pillars a

PDF Success of Continuous Miner in Bord and Pillar Method

miner opens the roadway width out to 6.5m the second cut width is then only 3.2m. Along with An evaluation of mining methods using continuous a suitable method of mining can be

The Obuasi Mine Longitudinal Retreat Mining Method

The Obuasi Mine has been in operation for the past 100 years. Within this period a host of mining methods have been employed during its various changing phases. The causes for the changes are multiple ranging from orebody capability dynamics technology safety economics production levels geotechnical etc. Mining methods applied have also ranged from timber square setts conventional cut

HISTORY AND METHODS Mining Science and Technology

Longwall retreat mining. Longwall advance mining. There are two methods used to cut a web of coal from the longwall face. The BiDirectional bidi method. The shearer cuts a fresh web of coal each time it traverses up and down the coal face. The UniDirectional unidi method. The shearer cuts a web of coal from one side of the

Coal Mining Methods of Extraction Underground Mining

Shortwall mining a method currently accounting for less than 1 percent of deep coal production involves the use of a continuous mining machine with movable roof supports similar to longwall. The continuous miner shears coal panels 150 to 200 feet 40 to 60 m wide and more than a halfmile 1 km long having regard to factors such as

VI. Underground Coal Mining in the Bituminous Coalfields

method normally ranging between 35 and 70 percent. The highest coal recovery is normally achieved when retreat mining is combined with roomandpillar mining. This method is often referred to as roomandpillar with retreat mining. Retreat mining is a systematic removal of coal support pillars once a mining section has been developed using

Major Mines and Projects Mining Intelligence and News

The mining methods employed at Mufulira Mine are variants of Mechanised Continuous Retreat MCR . The variant mining methods are Mechanised Continuous Retreat 1 MCR1 and Mechanised Continuous Retreat 2 MCR2 employed at Mufulira West and Mufulira Central. RAP mining is employed at Mufulira East.

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