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4.3.2 Underground Mining Methods ABC 123 Testing

Shrinkage stoping. Shrinkage stoping is used to recover steeply dipping orebodies when the ore and host rock are reasonably competent. A stope i.e. a large section of the mine where active production is occurring is mined but the broken ore is not removed but rather is left in place to support the walls of the stope until the time when all of the broken ore will be removed.

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Evaluation of the use of sublevel open stoping in the

 · The DLSOS stoping method is an adapted sublevel open stoping method with backfill. In this method the stoping sequence is from bottom-up and therefore the blasted ore is mucked under the protection of the upper stope pillar. The muck is not affected by the weight of overlying strata and the stress is not transferred.

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Improvements in Stoping Methods at Mount Isa Mines

The early planners selected sublevel stoping with ring drilling for ore breaking as the most efficient and economical for Mount Isa conditions This method satisfied requirements for 1. a low cost mining method for the comparatively low grade ores 2. a stoping sequence allowing development stope preparation breaking and drawing of ore to

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Description of mining methods (step by step)

The orebody is divided into panels three or four levels high the stoping sequence starts at the end of the bottom ore level using a similar method to the traditional method described above. When a section has been stoped out the void is backfilled using broken waste rock from the

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Cut-and-Fill stopingResearchGate

Introduction It is one of the more popular methods used for vein deposits and has recently grown in use. It is an expensive but selective mining method with low ore loss and dilution.

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Underground Mining MethodsUFRGS

 · pillar and cut-and-fill stoping. With this method ore is recovered in horizontal slices starting from the bottom and advancing upward. Pillars are left inside the stope to support the roof. Mined-out stopes are hydraulically backfilled with tailings and the next slice is

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4.3.2 Underground Mining Methods ABC 123 Testing Site

Shrinkage stoping. Shrinkage stoping is used to recover steeply dipping orebodies when the ore and host rock are reasonably competent. A stope i.e. a large section of the mine where active production is occurring is mined but the broken ore is not removed but rather is left in place to support the walls of the stope until the time when all of the broken ore will be removed.

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Shrinkage stoping Vertical Crater Retreat stoping

Vertical Crater Retreat (VCR) or Vertical Retreat Stoping configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore leading them to the base of

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Lecture 4 Underground MiningSlideShare

 · 3) Stull stoping Stull stoping is a common method of to mine vertical ore bodies or steeply-dipping ore bodies (because the stopes become long narrow near- vertical spaces which if one reaches the surface is known as a Gunnis or Coffen 1 ). Stull stoping is a form of stoping used in hardrock mining that uses systematic or random timbering

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Numerical modelling of ore dilution in blasthole stoping

The method is used to mine ore where both the ore and wall rocks are relatively strong. The method may be applied to a variety of vertical or steeply dipping orebody shapes and sizes. The blasthole mining method provides limited selectivity. Since it is a bulk method blasthole mining results in some overbreak.

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OPTIMIZATION OF PRODUCTION PLANNING IN

 · optimization model for open stoping mining method. The stope design model maximizes Net cash flow of the stope while adhering to the stope constraints. The methodology considers open stoping sequence in which every block is moved towards the cross-cuts at the lower level.

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Research on sublevel open stoping recovery processes of

 · This method not only changes the temporal sequence of ore stoping and realizes transportation using gravity and trackless devices but also improves production capacity and efficiency. Nonetheless this method also has some disadvantages for example the orebody has more contact with country rock and the method has a more complex loss and

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Stoping Mining MethodsMetallurgist Mineral

Stoping Methods

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Shrinkage stopingQueensMineDesignWiki

 · Shrinkage stoping is a mining method used for steeply dipping narrower ore bodies with self supporting walls and ore. It is an overhand mining method that relies on broken ore being left in the stope to be used as the "working floor" and to support the walls.

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(PDF) Sublevel Stoping Underground Mining Methods

Sublevel stoping configuration method in stopes where the ore is detonated by drilling a fan. or parallel large part of the ore is removed from the stope as it is being detonated leaving. open

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Transverse longhole stopingQueensMineDesignWiki

 · Transverse longhole stoping is a bulk mining method in which the long axis of the stope and access drifts are perpendicular to the strike of the orebody. Typically drawpoints are located in under-cut access drifts which extend from the footwall and the free face is mined

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Lesson 8.3 Mining by Unsupported Methods ABC 123

Open stoping. This type of mining is used to recover steeply dipping orebodies in competent rock. The ore is removed from the stope as soon as it is mined. Sublevel stoping and big-hole stoping are the important variants in use today. A few examples of commodities mined by this method include iron and lead/zinc. 8.3.1 Room and Pillar Method.

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Safe mining practices under wide spans in underground

 · The area of interest is a mining block of 75 m in height and located approximately 165 m below the mined out open pit as shown in Fig. 3.Footwall access drifts on all sublevels at 25 m intervals were initially developed for conventional open stoping in a transverse mining layout but due to lack of cement supply and its high cost the mining method was changed to AVOCA with two or three ore

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Experimental Investigation of the Influence for Stoping

In this study a self-designed scaled physical model was conducted to investigate the variation laws of lateral pressure under different stoping sequences and granular gradings and drawing ore in the experiments was used to simulate the mining process. Under the limiting equilibrium state the values of lateral pressure increased exponentially with the increasing depth of granular media and

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Experimental Investigation of the Influence for Stoping

In this study a self-designed scaled physical model was conducted to investigate the variation laws of lateral pressure under different stoping sequences and granular gradings and drawing ore in the experiments was used to simulate the mining process. Under the limiting equilibrium state the values of lateral pressure increased exponentially with the increasing depth of granular media and

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Numerical modelling of ore dilution in blasthole stoping

 · The method is used to mine ore where both the ore and wall rocks are relatively strong. The method may be applied to a variety of vertical or steeply dipping orebody shapes and sizes. The blasthole mining method provides limited selectivity. Since it is a bulk method

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Metalliferous Miningore stope and ft

 · Sub-level Stoping. This mining method was developed in the Michigan iron mines. The principles of the method are il lustrated in fig. 8. Main levels are from ioo to 1 so ft. apart and are connected by raise. At intervals of 20 to 25 ft. vertically sub-levels 7 to 8 ft. high are driven from the raise to the end of the stope.

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Shrinkage stoping Vertical Crater Retreat stoping

Vertical Crater Retreat (VCR) or Vertical Retreat Stoping configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore leading them to the base of

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Cut and Fill StopingSlideShare

 · Topic 6 Underground Mining Methods Cut-and-Fill stoping Hassan Z. Harraz hharraz2006 yahoo 2014- 2015 2. Outline of Topic 6 Introduction Application of Cut-and-Fill (C F) stoping The activity cycle of the (C F) method Stages of the production cycle of the C F method Sequences of extracting ore bodies Filling in C F Method About

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Stoping mining Britannica

Stoping in mining engineering the opening of large underground rooms or stopes by the excavation of ore.Stoping is practiced in underground mineral mining when the surrounding rock is strong enough to permit the drilling blasting and removal of ore without caving mines where the rock requires no artificial support the operation is known as open stoping.

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Underground Mining Methods

 · 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. Jumbos selectively drill holes into the roof of the drift and fill them with explosives.

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Stability analysis of backfilling in subsiding area and

 · The stoping of the ore body is located between −312 m and −410 m in the west wing including seven segments from A to G (from top to bottom). Each segment is subdivided into three stoping subsections (#1 #2 and #3) considering the long strike work strength and project layout.

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8.3.3 Sublevel (Open) Stoping ABC 123 Testing Site

 · 8.3.3 Sublevel (Open) Stoping. If we had a stronger and more competent host rock we could dispense with the need to keep ore in the stope to support the hanging wall as we do VCR mining. Indeed such deposits do exist and when they do we can employ the open stoping method. There are different variations but essentially we delineate stopes

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Shrinkage stopingQueensMineDesignWiki

 · Shrinkage stoping is a mining method used for steeply dipping narrower ore bodies with self supporting walls and ore. It is an overhand mining method that relies on broken ore being left in the stope to be used as the "working floor" and to support the walls. During the mining cycle only 3035 of the ore blasted is extracted being

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Longitudinal longhole retreatQueensMineDesignWiki

 · 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.

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Stope mining Britannica

Other articles where Stope is discussed mining Underground mining of extracting ore are called stopes or rooms. There are two steps involved in stoping. The first is development—that is preparing the ore blocks for mining—and the second is production or stoping itself. Ore development is generally much more expensive on a per-ton basis than stoping so that every effort

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Underground Stoping Practice Methods

 · Variations of the principal methods differences in methods of drilling and blasting handling ore and waste in the stopes transferring broken ore from the stopes to the haulageways and filling and timbering operations and variations in sequence and direction of stoping are employed to suit local conditions.

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Probabilistic stability analysis of open stopes in

Over the past years maintaining the stability of underground excavations has grabbed attention with the growing tendency of exploitation of deep underground mineral resources. Since sublevel stoping is recognized as the most widely applied method in Canadian underground mines assessing the open stope stability develops concern for rock mechanics engineers over preserving mining production

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Transverse longhole stopingQueensMineDesignWiki

 · Transverse longhole stoping is a bulk mining method in which the long axis of the stope and access drifts are perpendicular to the strike of the orebody. Typically drawpoints are located in under-cut access drifts which extend from the footwall and the free face is mined in a horizontal retreat from the hanging wall to the footwall.

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Description of mining methods (step by step)

The orebody is divided into panels three or four levels high the stoping sequence starts at the end of the bottom ore level using a similar method to the traditional method described above. When a section has been stoped out the void is backfilled using broken waste rock from the decline and crosscut development.

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Cut and Fill StopingSlideShare

 · Topic 6 Underground Mining Methods Cut-and-Fill stoping Hassan Z. Harraz hharraz2006 yahoo 2014- 2015 2. Outline of Topic 6 Introduction Application of Cut-and-Fill (C F) stoping The activity cycle of the (C F) method Stages of the production cycle of the C F method Sequences of extracting ore bodies Filling in C F Method About

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