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the design of pillars in the shrinkage stoping of a

Sabinet The design of pillars in the shrinkage

This paper descriptionbes the method used at Agnes Gold Mine in the calculation of pillar strengths, which involves a back-analysis type of approach. The results obtained there are comparable with those obtained by accepted formulae for pillar strength. It was found that a stress level of 70 MPa for the width of combined pillars (Le. crown and sill pillars) causes failure of

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Journal Papers The design of pillars in the shrinkage ...

2021-1-10  The design of pillars in the shrinkage stoping of a south african gold mine. AUTHOR RWO Kersten. file v084n11p365.pdf description Journal Paper Vol 084 - No 11 - Pg 365. page 365. Add comment. Name (required) E-mail (required, but will not display) Notify me of follow-up comments. Send.

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Shrinkage stoping - QueensMineDesignWiki

2019-6-28  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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Design methods for stopes and sill pillars with ...

The design of pillars in cut-and-fill mining and open stoping in vertical and subvertical orebodies is of vital importance in optimizing mining operations. The primary requirement for a good and reliable design technique is the ability to represent the actual physical behaviour of the pillar. In this paper, a new methodology for stope roof and sill pillar design is proposed for the

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Shrinkage Stoping - Introduction to Shrinkage Stoping

Physical and/or mineralogical characteristics of the broken ore may impose restrictions on stope design and/or operational plan¬ning, and may even preclude the use of shrinkage al¬together. Examples include: ores which, when broken, are cohesive or which tend to pack or cement together under the influence of ground water, wall pressure, and ...

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(PDF) Rib pillar design in open stope mining

The approach involves an empirical method for pillar design and a discusion of the pillar stability used for open stope mining methods. The empirical method predicts the stability of rib pillars.

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Shringkage Stopping Strength Of Materials Column ...

2014-5-31  Shringkage Stopping - Free download as PDF File (.pdf), Text File (.txt) or read online for free. FREE TO READ

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SECTION 10 SHRINKAGE METHODS Mike Turner

2006-7-8  Shrinkage mining was a common stoping method prior to mechanised mining and the introduction of hydraulic fill. Sub-level stoping, cut and fill mining and sub-level caving have generally replaced shrinkage mining in Australia, Europe and Canada. The method is still used in a handful of non-mechanised mines in South America, Africa, Asia and Canada.

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(PDF) Narrow-vein stoping practice: a United

stopes and pillars, based on the probabilistic approach, an entry design (shrinkage stope) allowed optimum spans of about 8 m at 67oh recovery, whereas a non-entry design (sub-

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Room and Pillar Stoping - Xinhai

Room and Pillar Stoping. Post pillars are reserved in the stope for support. According to the depth of blasting holes, there are two mining methods: short-hole room and pillar stoping; medium- and deep-hole room and pillar stoping.

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Stope And Pillar Mining - José Hidalgo

Shrinkage Stope Mining Mining Methods Mining. 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 horion leaving broken rock in the excavation created. The broken rock acts as a working platform and assists to stabilie the excavation by supporting the walls.

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Sub-level open stoping - QueensMineDesignWiki

2019-6-28  Sill and crown pillars are also a key support development in sublevel stoping. They are used between vertically adjacent stopes (sill pillar) or between a stope and surface operations (crown pillar). These pillars provide roof and floor support as well as aid in the prevention of cave-ins, rock bursting, and surface subsidence.

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SECTION 10 SHRINKAGE METHODS Mike Turner

2006-7-8  Shrinkage mining was a common stoping method prior to mechanised mining and the introduction of hydraulic fill. Sub-level stoping, cut and fill mining and sub-level caving have generally replaced shrinkage mining in Australia, Europe and Canada. The method is still used in a handful of non-mechanised mines in South America, Africa, Asia and Canada.

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Stoping Mining Methods - Metallurgist Mineral

2021-1-28  Table of ContentsStoping MethodsClassification of stoping methodsStopes Naturally Supported Open StopesStopes Artificially SupportedShrinkage StopingCut Fill StopingStulled Stopes in Narrow VeinsSquare-Set StopingCaved Stopes Mining MethodMining by Block Caving MiningMining by Sublevel CavingTop Slicing Mining MethodCombinations of Supported and Caved Stopes The subject of stoping

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Choice of Method

SHRINKAGE STOPING . The Sleeping Giant mine mainly uses the shrinkage stope method since a good selectivity can be obtained. _____ SEMI-SHRINKAGE STOPING . This method is generally used when the dip varies between 40 and 50 degrees. The mining is done like the shrinkage stoping. Given the gently dipping, the gravity sliding of the ore is difficult.

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A long hole stoping system for mining narrow platinum

2009-8-27  A long hole stoping system for mining narrow platinum reefs Sandvik. All relevant design perimeters of the area to be mined were taken into consideration. Production targets The following production targets were set: To optimize face advance (Target of 2 m per blast) 125 m drilled per single shift (5000 m per month on a double shift basis)

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12. Mining methods and method selection

2018-1-30  -Pillars are normally arranged in a regular grid array to simplify planning, design and operation.-Pillars may be permanently unmined or recovered in the orderly retreat from a mine panel.-Orebody must be relatively shallow to prevent commitment of excessive ore in pillars: orebodies of 6 m or greater height are worked by multiple passes.

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Description of mining methods (step by step)

To aid in local ground control, small sections of the orebody are left intact to act as pillars. With this stoping method, the completed stope is left as an empty void, which over time has created some regional ground control challenges. More recently, Kundana has employed a long-hole bench stoping method, which incorporates backfill.

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Lecture 4: Underground Mining - SlideShare

2011-11-2  Lecture 4: Underground Mining 1. Hassan Z. Harraz [email protected] 2010- 2011 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

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Stope And Pillar Mining - José Hidalgo

Shrinkage Stope Mining Mining Methods Mining. 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 horion leaving broken rock in the excavation created. The broken rock acts as a working platform and assists to stabilie the excavation by supporting the walls.

More

Shringkage Stopping Strength Of Materials Column ...

2014-5-31  Shringkage Stopping - Free download as PDF File (.pdf), Text File (.txt) or read online for free. FREE TO READ

More

Choice of Method

SHRINKAGE STOPING . The Sleeping Giant mine mainly uses the shrinkage stope method since a good selectivity can be obtained. _____ SEMI-SHRINKAGE STOPING . This method is generally used when the dip varies between 40 and 50 degrees. The mining is done like the shrinkage stoping. Given the gently dipping, the gravity sliding of the ore is difficult.

More

Shrinkage Method Mining Industries Avaliação ...

2015-3-4  Shrinkage mining was a common stoping method prior to mechanised mining and the introduction of hydraulic fill. Sub-level stoping, cut and fill mining and sub-level caving have generally replaced shrinkage mining in Australia, Europe and Canada.

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Test 3: Underground Mine Design Flash Cards: Koofers

Describe shrinkage stoping. The ore is excavated in horizontal slices from the bottom, but part of the broken ore is left in the stope to server as a working platform for mining and stope support. Ore swell is about 30 to 50% after blasting, so 40 to 60% of the blasted ore must be continuously removed to maintain room for the miners.

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SubLevel Stoping - Introduction to Sublevel Stoping

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).

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Chapter

2020-6-11  the roof; the pillars may or may not be removed at a later time; 7) Shrinkage stoping - a stoping method in which most of the blasted ore is left to accumulate in the stope until the stope is completely mined. The broken ore is then drawn off all at once. 8) Cut-and-fill - a stoping method in which ;:; ~

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Description of mining methods (step by step)

To aid in local ground control, small sections of the orebody are left intact to act as pillars. With this stoping method, the completed stope is left as an empty void, which over time has created some regional ground control challenges. More recently, Kundana has employed a long-hole bench stoping method, which incorporates backfill.

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POSSIBILITY OF APPLICATION OF BACKFILL METHODS

2017-6-8  Figure 3 - Sublevel open stoping method (Atlas Copco, 2007) 3.2. Bighole stoping method Bighole stoping is an up-scaled variant of sublevel open stoping, using longer, larger-diameter DTH blastholes, ranging from 140 mm to 165 mm. Blast patterns are similar to sublevel open stoping, but with holes up to 100 m long. However, the risk of

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Lecture 4: Underground Mining - SlideShare

2011-11-2  Lecture 4: Underground Mining 1. Hassan Z. Harraz [email protected] 2010- 2011 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

More