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Vertical Crater Retreat Mining Method - gmklein

Vertical crater retreat mining method vcr vertical crater retreat method applies to orebodies with steep dip and petent rock in both ore and host rock part of the blasted ore will remain in the stope over the production cycle serving as temporary support this mechanized

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Vertical crater retreat mining in the Sudbury Basin ...

Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes. The ore body is mined from the bottom up. The method in turn has required a change in

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Vertical Crater Retreat

Vertcial crater retreat is a comparatively new method of blasthole mining in which only large diamter ITH holes are used to blast down horizontal slices of ore into an opening below the block of ore being mined. The method on the 'cratering' effect of an explosive charge

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Vertical crater retreat mining in the Sudbury Basin ...

01/09/1991  VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C.W. Livingston's crater blasting theories and was developed by Inco and CIL Inc. [14]. First applied at the Levack Mine in 1974, the technique was soon in use at other mines in the Sudbury area, and in other min- ing camps

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A New Fast Vertical Method for Mining Frequent Patterns

based method called database projection to address the above problem, obviously, it will damage the performance because of frequently accessing disks. One advantage of FP-growth approach is the frequent pattern tree, which is a highly condensed data structure for storing the database. On the other hand, the biggest advantage of vertical mining algorithm is that each item is represented by ...

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CN103982186A - Bottom-pillar-free retreating

The invention relates to a bottom-pillar-free retreating vertical inclined strip sublevel caving mining method. According to innovation of a stope recovery process, the recovery cutting engineering is reasonably arranged, the drilling quantity is greatly reduced, two working faces are alternatively operated in a stope, centralized drilling, continuous blasting, centralized ore removal and one ...

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(PDF) Underground mining Methods - ResearchGate

The method is similar to cut and fill mining with the ex ception that after being blasted, broken ore is left in the stope where it is used t o support the surrounding rock and as a platform from ...

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BARBERTON GOLD MINES - PAN AFRICAN RESOURCES

CURRENT MINING METHOD. •Mechanised Mining– Cut and fill (90%) Waste from your infrastructure development is hauled back into stope for fill (Ramp system and Access cross cut which is then fan lifted) 55% of reef tons removed equates to waste tonnage requirement for

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Vertical crater retreat mining in the Sudbury Basin ...

01/09/1991  Vertical crater retreat mining in the Sudbury Basin. Min. Sci. Technol., 13: 131-143. Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely ...

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VERTICAL CRATER RETREAT.pptx Mining Science

CASE STUDY ON VERTICAL. CRATER RETREAT MINING. BY: SUJAN DALBEHERA DEVGAN SINGH 1. ABHAYA MISHRA VCR MINING Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO.. Today, VCR is an established mining method used by mines all over the world that have competent, steeply dipping ore and host rock.

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VCR Method_2018.pdf - MINE 411 Underground

MINE 411 Underground Mining Methods Equipment Course Instructor: Prof. Raymond S. Suglo Students: UMaT BSc. III 1 VERTICAL CRATER RETREAT (VCR) MINING METHOD The Vertical Crater Retreat (VCR) method is basically an open stoping method which resembles shrinkage stoping. It was developed in Canada. Area of Application The VCR method is used in mining steeply dipping narrow

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CN103982186A - Bottom-pillar-free retreating

The invention relates to a bottom-pillar-free retreating vertical inclined strip sublevel caving mining method. According to innovation of a stope recovery process, the recovery cutting engineering is reasonably arranged, the drilling quantity is greatly reduced, two working faces are alternatively operated in a stope, centralized drilling, continuous blasting, centralized ore removal and one ...

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A New Fast Vertical Method for Mining Frequent Patterns

based method called database projection to address the above problem, obviously, it will damage the performance because of frequently accessing disks. One advantage of FP-growth approach is the frequent pattern tree, which is a highly condensed data structure for storing the database. On the other hand, the biggest advantage of vertical mining algorithm is that each item is represented by ...

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Sequential Pattern Mining

• Vertical format-based mining: SPADE (Zaki [Machine Leanining’00]) ... • GSP (Generalized Sequential Pattern) mining algorithm • Outline of the method – Initially, every item in DB is a candidate of length-1 – for each level (i.e., sequences of length-k) do • scan database to collect support count for each candidate sequence • generate candidate length-(k+1) sequences from ...

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Development of Inspection and Surveying Tool for Vertical ...

Key words: vertical openings, video inspection, laser scanning, mapping SUMMARY Underground mining operations create many vertical (or near vertical) shafts to allow movement of rock (passage of ore) or ventilation between different levels within a mine. In most cases these shafts are not easily and safely accessible. A reliable and safe method of

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2.4. Mining Frequent Patterns by Exploring Vertical

Lesson 2 covers three major approaches for mining frequent patterns. We will learn the downward closure (or Apriori) property of frequent patterns and three major categories of methods for mining frequent patterns: the Apriori algorithm, the method that explores vertical data format, and the pattern-growth approach. We will also discuss how to ...

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Sinking Methods and Present Situation of

With the development of new mining area under construction and the development of deeper mines, the ratio of the mine shaft as access for underground mines will increase. The construction technology of the mine shaft engineering will be complicated, the operation site footprint will be small and the working environment will be more difficult. The mine shaft sinking operation will often be ...

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VERTICAL CRATER RETREAT.pptx Mining Science

f VCR MINING. Vertical crater retreat (VCR) mining is a method originally developed by the Canadian. mining company INCO. Today, VCR is an established mining method used by mines all over the world that. have competent, steeply dipping ore and host rock.

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A New Fast Vertical Method for Mining Frequent Patterns

Vertical mining methods are very effective for mining frequent patterns and usually outperform horizontal mining methods. However, the vertical methods become ineffective since the intersection time starts to be costly when the cardinality of tidset (tid-list or diffset) is very

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Geotechnical aspects of vertical crater mining

Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of stress concentration, jointing, dynamic stresses superimposed by blasting vibrations, amount of development required and shrinkage draw. All these factors favour a VCR method in a deep mining environment ...

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A new model for mining method T selection of mineral ...

vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining. Moreover, underground methods such as longwall may be performed in the retreat or advance mode and the ground control may be performed by caving or filling. Therefore choices in the mining method selection process are

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A New Fast Vertical Method for Mining Frequent

Vertical mining methods are very effective for mining frequent patterns and usually outperform horizontal mining methods. However, the vertical methods become ineffective since the intersection time starts to be costly when the cardinality of tidset (tid-list or diffset) is very large or there are a very large number of transactions. In this paper, we propose a novel vertical algorithm called PPV for fast frequent pattern

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12. Mining methods and method selection

12.4 Underground mining method •Shrink (Shrinkage) stoping-Applied to vertical or subverticaladvance of mining in a stope.-Broken ore used as both a working platform and temporary support.-Drilling blasting ®ore extraction ®scaling supporting.-30~35%

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Vertical opening safety practice in underground mines

well-established vertical opening procedures are clearly promulgated and rigidly adhered to. 5 Developing a system of vertical opening procedures Safe vertical opening procedures must be devised and implemented in underground mines where operations at two or more horizons are linked by vertical or subvertical openings.

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2.4. Mining Frequent Patterns by Exploring Vertical

Lesson 2 covers three major approaches for mining frequent patterns. We will learn the downward closure (or Apriori) property of frequent patterns and three major categories of methods for mining frequent patterns: the Apriori algorithm, the method that explores vertical data format, and the pattern-growth approach. We will also discuss how to directly mine the set of closed patterns.

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Sinking Methods and Present Situation of

"A mine shaft is one main development method of establishing access in an underground mine. The construction technology of the mine shaft sinking is complicated and large equipment setup on surface and in the mine shaft. The paper briefly reviews a single-line operation method, parallel operation method and mixed operation method as well as the features of the one operation method with the

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Estimation of the potential production rate ...

Half Vertical Tonnage. The half vertical tonnage rule of thumb is used in steeply dipping mechanized vertical deposits. The rule is similar to Taylor's rule as it is based of tonnage, however it uses the average tonnage divided by depth instead. The rule is as follows: Alternatively a factor of 1/3 may be used instead of 1/2. Summary

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VCR Method_2018.pdf - MINE 411 Underground

III 1 VERTICAL CRATER RETREAT (VCR) MINING METHOD The Vertical Crater Retreat (VCR) method is basically an open stoping method which resembles shrinkage stoping. It was developed in Canada. Area of Application The VCR method is used in mining steeply dipping narrow to

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Geotechnical aspects of vertical crater mining

Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of stress concentration, jointing, dynamic stresses superimposed by blasting vibrations, amount of development required and shrinkage draw. All these factors favour a VCR method in a deep mining environment.

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12. Mining methods and method selection

12.4 Underground mining method •Shrink (Shrinkage) stoping-Applied to vertical or subverticaladvance of mining in a stope.-Broken ore used as both a working platform and temporary support.-Drilling blasting ®ore extraction ®scaling supporting.-30~35%

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A New Fast Vertical Method for Mining Frequent

Vertical mining methods are very effective for mining frequent patterns and usually outperform horizontal mining methods. However, the vertical methods become ineffective since the intersection time starts to be costly when the cardinality of tidset (tid-list or diffset) is very large or there are a very large number of transactions. In this paper, we propose a novel vertical algorithm called PPV for fast

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Mining method evaluation and dilution control in Kittilä mine

undercuts can be prevented by systematically bolting these cuts. The proposed mining method is cut-and-fill stoping, which technically is the same as longhole open stoping with delayed backfill that is currently being used. The maximum width of the longitudinal stopes should be increased from 7m to 10m. Stope length and level height

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(PDF) Closed Frequent Pattern Mining Using

transaction’s array in verticaldataarrayvArray If the vertical data format can be added with a depth-first fori=1 to (n-1) do candidate generation out of the search space, then it can if (vArray[i].supportCount>= minsup) be a good variation in the evolution of mining closed while traversing tree of ith item in frequent patterns. The point of thought is that both Depth-first manner if (any pattern with Vertical Data Format

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Eastplats moves ahead at Barplats - Mining Magazine

The retreatment project for chrome concentrates includes a combined hydro and mechanical re-mining method and magnetic separation applied to produce chrome concentrates, thus offering a greater yield result versus traditional gravity technology. The Crocodile River retreatment project is the only large-scale magnetic separation application in South Africa. It is projected to continue ...

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Tutorials/Mining – Official Minecraft Wiki

17/04/2021  Just remember to be careful of monsters, so always bring a sword when using this method. Vertical shaft mining . Vertical shafts are mined vertical tunnels used to gain access to underground mining sites. They can be of any width starting from 2×1 blocks,or 1x1. Don't forget to keep a water bucket and a stack of blocks in your hotbar, to deal with lava quickly. 1×1 . Also known as "Digging ...

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Vertical Development - The Mancala Group

The method which can incorporate grouting of the shaft/liner annulus has been used on shafts up to 5.5m in diameter and in excess of 320m depth with the total liner segments weigh over 240 tonnes. Off site fabrication and on site assembly during raise boring allows installation rates of up to 40 metres per day.

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Estimation of the potential production rate ...

Half Vertical Tonnage. The half vertical tonnage rule of thumb is used in steeply dipping mechanized vertical deposits. The rule is similar to Taylor's rule as it is based of tonnage, however it uses the average tonnage divided by depth instead. The rule is as follows: Alternatively a

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