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sublevel stoping mining method pdf

12. Mining methods and method selection

 · Optimal stope dimension for underground mining using sublevel stopping method is decided ensuring excavation stability. This is done evaluating rock mass conditions during the whole mining period in order to reduce operational hazards thus ensuring continuous production. Mathew's stability graph method is used as an analytical tool to achieve ...2. Sublevel stoping method in brief Sublevel stoping is one of the most useful underground mining methods in steeply dipping hard-rock ore bodies. Herein mining method existence of a high plunge length in the ore body is essential. It provides required geometrical form to create12.4 Underground mining method •Sublevel open stoping-Ore is fragmented in the stopeusing ring-drilled or long parallel blast holes, and moved to the drawpointsfor extraction.-Bigholeopen stopinguses longer blast holes with larger diameter of 140~165 mm: sublevel spacing increases from typically 40 ….

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(PDF) UNDERGROUND MINING METHODS

Lece mine utilizes sublevel stoping mining method with drilling and blasting as main excavation technology. Drill holes (75mm) are drilled in ring/fan pattern from the level of sublevel drift using hydraulic hammer. ANFO is used as main explosive, while initiation is done using detonating cord and electric detonators. ...A mining method involving overhand, underhand, and shrinkage stoping. Its characteristic feature is the use of sublevels. The sublevels are worked simultaneously, the lowest on a given block being farthest advanced and the subs above following one another at short intervals. The uppermost sublevel underneath the cover is partly caved.Fig. 6: Sublevel open stoping, generalised after Hamrin (, ) 2.2.3 Sublevel Caving Sublevel caving is another method available for mining of the large steeply dipping ore bodies (Fig. 7). This technique uses sublevels developed through the entire ore body at regular intervals.

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(PDF) Sublevel Stoping Underground Mining Methods

2 Sublevel retreat mining method The SLR mining method is a top-down unsupported method with no backfill. It is similar to sublevel cave mining in function, except the waste rock hanging wall is strong enough to not cave. Rather than subsidence, it leaves a glory hole exposed to surface. · The method is suited for deposits that can be mined by the sublevel stoping method. This mining method is considered one of the best underground mining method currently available due to its low operation cost and the high security for the mine workers. Further research is needed to adapt the approach to other mining methods.Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes Production How Cratering Works.

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Appendix C Mining Methods

Mining continues upwards towards the sur-face until the orebody is depleted. Sublevel stoping Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom of the mine. Before mining begins, an ore pass is usually drilled from a lower to a higher elevation.INTRODUCTION The sublevel stoping mining method is usually applied to a relatively steeply dipping, competent ore body, surrounded by competent wall rock. Ore is produced by drilling and blasting longholes, which can range from 50 mm (2 in.) to 200 mm (7% in.) diam, with lengths up to 90 m (300 ft).Description of Mining Methods Shrinkage Stoping Shrinkage stoping is applicable to ore zones that are dipping at least 55 degrees and that range in width from roughly 1.2 to 4.5 meters. The enclosing waste rock must be competent and not subject to failure so that when the ore is drawn from the stope, dilution is kept to a minimum.

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POSSIBILITY OF APPLICATION OF BACKFILL METHODS WITH

The mining method selected is determined by the size, shape, orientation and type of orebody to be mined. The orebody can be narrow vein such as a gold mine in the Witwatersrand, the orebody can be massive similar to the Olympic Dam mine, South Australia, or Cadia-Ridgeway Mine, New South Wales.The width or size of the orebody is determined by the grade as well as the distribution of the ore.Method Tonnes / Avg. Tonnes / Relative Mining Manshift Day Milled Cost/Tonne Resuing 0.20

the mining method chosen. When the grade is highly variable in the orebody, re­ coveries normally decrease on passing from a selective method of mining (such as cut-and-fill, for instance) to a non-selective method (such as sublevel stoping). For the same tonnage, grades are lower, while for the same grades tonnages decrease.1. Underground Mining Methods 1.1. Classification of Underground Mining Methods 1.2. Underground Operations in General 1.3. Room-and-pillar Mining 1.4. Sublevel Stoping 1.5. Cut-and-fill Stoping 1.6. Longwall Mining 1.7. Sublevel Caving 1.8. Block Caving 2. Underground Mining Machinery Glossary Bibliography Biographical Sketches SummaryThis 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.

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Sublevel retreat mining in the subarctic: a case study of

Rock Mass Mining Method Stope Wall Blast Hole Roof Rock These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.Open pit mining Mining Methods 5 Open pit mines are used to exploit low grade, shallow ore bodies. However, some pits are quite deep

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. · Lece mine utilizes sublevel stoping mining method with drilling and blasting as main excavation technology. Drill holes (75mm) are drilled in ring/fan pattern from the level · Sublevel stoping..Underground mining methods 1. Hassan Z. Harraz [email protected] - This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.

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Underground Mining Methods

The invention relates to the technical field of stoping methods and particularly relates to an underhand sublevel open stoping method. The underhand sublevel open stoping method comprises the following steps: firstly, arranging an ore block along the direction of an ore body and dividing the ore block into an ore room and an ore column; dividing the ore block into 3-5 sublevels in the vertical ...Figure 3

Lece mine utilizes sublevel stoping mining method with drilling and blasting as main excavation technology. Drill holes (75mm) are drilled in ring/fan pattern from the level of sublevel drift using hydraulic hammer. ANFO is used as main explosive, while initiation is done using detonating cord and electric detonators. ...SUB-LEVEL OPEN STOPING: DESIGN OF THE O640, L651 AND N659 SUB-LEVEL OPEN STOPES IN THE OREBODY OF THE MOUNT ISA COPPER MINES, QUEENSLAND, AUSTRALIA L. SLOANE Presented in partial fulfilment of the requirements for the degree: M.ENG (MINING ENGINEERING) IN THE FACULTY OF ENGINEERING DEPARTMENT OF MINING UNIVERSITY …Mining continues upwards towards the sur-face until the orebody is depleted. Sublevel stoping Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom of the mine. Before mining begins, an ore pass is usually drilled from a lower to a higher elevation.

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