stope and pillar mining

methods and brief explanations of the techniques of room-and-pillar mining sublevel stoping cut-and-fill longwall mining sublevel caving and block caving The second section describes underground mining equipment with particular focus on excavation machinery such as boomheaders coal cutters continuous miners and shearers 1 Veins are often mined using stope mining which involves excavating portions of ore creating cave-like voids underground Massive orebodies are usually mined using bulk mining methods by creating stopes There are many types of stope mining If the orebody is tabular (flat and generally dipping) room-and-pillar methods are commonly used

Open Stope Mining

The open stope method is applicable to deposits with stable ore and rock and the stope is allowed to have a relatively large exposed area within a certain period of time In its process there are two phases——stope room and pillars The stope room is always open with the pillars and surrounding rock naturally supporting the goaf

A large portion of an underground stope unexpectedly collapsed The mining term used by the company is an "unexpected fall of ground " It was described by MSHA inspector as a "substantial" event and could have happened at any time the possibility of complete crown pillar failure should be a

Aug 25 2010Long-hole open stope mining (LHOS) - general diagram Recap of low-profile room and pillar mining in the Lamaque no 2 flats As mentioned the low-profile room and pillar mining we are currently performing in the Lamaque no 2 area should be somewhat similar to the last animation video especially with regards to the mechanization aspect

of the Mining Journal and many other members of the mining community the Hard Rock Miner's Handbook has been distributed to over 113 countries worldwide Web hits and downloads continue as students and professors miners engineers and mining executives embrace the Handbook as an invaluable source of practical

Accurate realistic scheduling is essential to smooth production rates Also initial recovery of ore in a stope/pillar block is normally from 35% to 50% in sublevel stoping Planning of pillar recovery representing the majority of ore tonnage in a production block must be done during early mine planning

Evaluation of the Active Support and Yielding Bearing

Between the beginning of yield and complete failure the natural pillar is known as a "yielding pillar " which is first proposed for the room and pillar mining method to form a stress release region on the stope roof to reduce the load on the natural pillar

This paper discusses the stope parameters of the sublevel subsequent filling stage in Daye Iron Shizishan section According to the similar material simulation technology which is the main means displacement monitoring and internal stress monitoring several conclusions are summarized as bellow When the parameter of the room and pillar is 18m the underground mining is safe and steady

Therefore the research on safe and efficient technology used for secondary mining of thick seams in gateway and pillar mining areas is of universal significance For an effective release in the stress-concentrated area of gateway-and-pillar goaf the technology of back stoping from a level floor can be accepted as an effective method

In underground ore body mining the mining method plays an important role in the stability of the stope structure and ground pressure control However with the gradual mining of ore body the horizontal pillar with a thin plate structure ma y cause accidents due to instability [1] Therefore

After active mining has been completed to the level above or to the floor pillar the rest of the broken ore is drawn off from below leaving the stope empty It may be filled with waste later to prevent general movement and subsidence or to permit mining of pillars left between stopes during the first mining

Stope geometry Apollo Gold Corporation - Diamond Hill mine (U S A) Primary Mining Method Open stope Information LOTUS DEEP ZONE Total length of the zone approximately 1000 m (3280 ft) Secondary Mining Method Room-and-Pillar Information Length 20 to 25 m (66 to 82 ft) and a pillar of 3 to5 m (10 to 16 ft) is left

Room and Pillar mining Room and pillar mining is commonly done in flat or gently dipping bedded ore bodies Pillars are left in place in a regular pattern while the rooms are mined out In many room and pillar mines the pillars are taken out starting at the farthest point from the stope access allowing the roof to collapse and fill in the

Deswik SO (Stope Optimizer) from Deswik PRO 3 years ago pillar sizes dilution mining limits and waste ratios The scenario management tools allow multiple mining options to be considered and compared rapidly generating output reports that let you optimize for your best case

Eagle Mine Phase 4 Crown Pillar Engineering

crown pillar footprint is not of concern and as such stability assessments have focused on an "open ground" effect (e g stope-by-stope stability assessment as opposed to overall crown pillar footprint) The justification for this approach is that the stope walls are stable for the range of conditions encountered at Eagle Mine

like strike and dip as well as stope and pillar widths Dilution offsets define planned dilution width on both footwall and hangingwall sides of the stope ECONOMIC OPTIMIZATION Use geological model fields as cut-off values or calculate a value with grade mining recovery price mining

Oct 23 2011Mining methods for s teeply dipping and massive deposits Self supported methods Sublevel caving Block caving Induced Block Caving Sublevel stoping Undercut and fill stoping Square-set stoping Cut-and-fill stoping Shrinkage stoping With caving of overburden Without caving of overburden Supported methods Large open stope mining Top slicing

To excavate ore in a vein by driving horizontally upon it a series of workings one immediately over the other or vice versa each horizontal working is called a stope because when a number of them are in progress each working face under attack assumes the shape of a flight of stairs

UNDERGROUND MINE DEVELOPMENT Nature and scope of the task -- Mine development and design -- Mine plant layout -- Construction of development openings -- Shaft hoisting systems -- Special topic design of hoisting system -- UNDERGROUND MINING UNSUPPORTED METHODS Classification of methods -- Room-and-pillar mining -- Stope-and-pillar mining

a mining context more than 20 years ago led to the development of the Scaled Span empirical design guidelines for surface crown pillar rock thickness dimensioning discussed in this paper The initial guidelines (Golder Associates 1990 Carter 1992 and Carter and Miller 1995) which were mainly developed looking at steeply dipping

The room-and-pillar mining method is predominantly used since it allows the adjustment for sudden changes in direction of the vein However the management is endeavouring to introduce the long-hole mining method since the manpower for conventional mining is extremely rare STOPE MINING Blocks of 25-m (82 ft) maximum length are planned to

Shrinkage Stope Mining Shrinkage stope is a generic term used in mining to portray the process of mining upwards from a lower to an elevated horizon leaving broken rock in the excavation created The broken rock acts as a working platform and assists to stabilize the excavation by supporting the walls

In this mining technique a series of horizontal tunnels or sub-levels are excavated one above the other to access different levels of a vertical ore deposit At the bottom of the stope is a haulage tunnel which is used to transport ore that collects at the bottom

Room and pillar is a type of breast stoping Timbered-stope systems Stull stoping Stull stoping is a form of stoping used in hardrock mining that uses systematic or random timbering (stulls) placed between the foot and hanging wall of the vein The method requires that the hanging wall and often the footwall be of competent rock as the

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