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Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining. In the first phase of room and pillar mining, tunnels are advanced into the coal or ore body in a rectangular pattern resembling city streets. Pillars are left between tunnels to support the weight of
longitudinal retreat mining method. Narrow vein and low profile . Mining methods applied have also ranged from timber square setts, conventional cutandfill (CAF), shrinkage stoping, sublevel caving, mechanised CAF, longitudinal and transverse open stoping, and lately the longitudinal retreat mining method (LRMM).
The primary mining method is longitudinal retreat longhole stoping. Ore is hauled by truck to the Kremzar mill located approximately km from the portal of the ramp. Processing Method:
2) Room (Bor d)andPillar mining (or con tinuous mining) method It is the most common supported pillar method, designed and used primarily for mining flatlying
Longitudinal Retreat Mining Method. Our company mainly produces five series of products, including crushing equipment, sand making equipment, mineral processing equipment, grinding equipment and building materials equipment. 40 years of mining machinery manufacturing history, three production bases, exported to more than 160 countries and regions, We are your trusted partner and service
Of all the methods tested since mining activities commenced at the Island Gold mine, the longitudinal longhole retreat mining is the preferred method. The ore width, vertical dip, good ground quality, productivity factors, costs, and availability of equipment and personnel were some of the major parameters involved in the decision.
Longitudinal longhole retreat QueensMineDesignWiki
9/3/2018#0183;#32;Selecting a Mining Method. Some common ones include longitudinal stoping, transverse longitudinal stoping, bighole stoping, and vertical crater retreat. Longitudinal stoping, also referred to as bench stoping or sublevel benching is a preferred method when the orebody is thin and narrow and steeply dipping and sheetlike. Transverse
The longhole retreat mining method was selected for the narrow orebody extraction. The reasons being related to economic, ground conditions and the manpower in place, experienced with the longhole mining method. Additional factors also lead to the selection of the mining method: safety, continuity of the orebody, ore recovery, and
Lapa Mining Method 26m Longitudinal Retreat AGNICO EAGLE . Title: PowerPoint Presentation Author: George Dikho Created Date: 3/1/2013 10:26:46 AM
Figure 1 Longitudinal view of the LaRonde orebody 2 Geological setting Mining method a longitudinal retreat method and backfilled with either cemented rockfill or pastefill. 1 28 33 99 10 10 41111 55 66 12 12 13 13 77 Figure 3 Ideal mining sequence Basalt Felsic tuff .
Longitudinal bottomup stoping has been used above 190 level. Due to the orebody width and mine sequencing, stopes between the 190 level and the 280 level are mined using the transverse method with primary and secondary stopes, with some longitudinal retreat mining occurring at the extremities of the orebody. Most of the primary stopes above the 280 level have been mined out with the majority of the
The mining methods are longitudinal retreat with paste backfill, and transverse open stoping with paste or unconsolidated backfill. In its first year of operation, the mine achieved its designed production rate of 1,975 tonnes/day. Integration and pilot testing of automated mining equipment (two trucks and one scoop tram) continued in 2019.
This method consists in a variety of chambers where the mine blocks are generally cut by sublevels from which long holes are drilled in plans that are generally parallel. These boreholes allow to blast the block by successive vertical break. The broken ore is mucked out by drawpoints or by longitudinal retreat.
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 cutandfill, shrinkage stoping, sublevel caving, mechanised cutandfill, longitudinal and transverse open stoping, and lately longitudinal retreat mining method (LRMM).
The orientation of longitudinal mining methods means that the hanging wall and footwall of the orebody will most likely form the sidewalls of the stope. In general, longitudinal methods are used where the rock mass quality of the hanging wall rock is competent enough to allow the development of a substantial opening in the hanging wall or footwall.
Eagle Mine215 . This method provides the cost advantages of bulk mining, while maintaining a degree of selectivity and operational flexibility. The majority of the stopes will be mined as transverse bench and fill stopes, with some thinner thickness zones of the orebody mined as longitudinal retreat
Mining method The primary mining method used at Lapa is longitudinal open stoping with cemented backfill (Figure 4). Sublevels are developed at 30 m intervals and the ore is removed between the sublevels using the long hole blasting technique in a longitudinal retreat configuration. Typical stope size is 12 m wide by 30 m high
9/3/2018#0183;#32;Some common ones include longitudinal stoping, transverse longitudinal stoping, bighole stoping, and vertical crater retreat. Longitudinal stoping, also referred to as bench stoping or sublevel benching is a preferred method when the orebody is thin and narrow and steeply dipping and sheetlike.
Longitudinal Longhole Retreat Variations Avoca. Avoca mining consists of an undercut level and an overcut level. The cross cuts are in waste and connects the... Eureka. This method in inspired from avoca. The eureka mining method involves eliminating the waste development to the... Creeping Cone.
LaRonde uses two mining methods: longitudinal retreat in 15m sections with cemented rockfill or cemented pastefill, as well as transverse open stoping with both cemented and unconsolidated rockfill as well as cemented pastefill. Sublevels are driven every 30 or 40 m, depending on depth.
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