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double bench mining method

OPEN CAST MINE PLANNING

Improving Double Bench Face Performance at the Ekati Diamond MineTM Site ... mining was conducted with a excavator, 994 and 992 loaders matched with 777 haul trucks. ... the greater the depth to which the kimberlite pipe can be extracted using open pit methods…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. ...Sr. Mining Engineer OPEN CAST MINE PLANNING Factors that influence planning: 1) Demand of coal. a. Countrywide demand b. Regional demand 2) Distribution of coal deposits 3) Quality of coal 4) Pricing policy for coal 5) Available infrastructures: rail, road, power, etc. 6) Nature of deposits (influences site, area method of work, & equipments of.

A better way to presplit

Sloping a method of protecting employees from cave­ins by excavating to form sides of an excavation that are inclined away from the ... For simple bench systems in TYPE A soil and a trench depth of less than 20 feet, the steepest maximum allowable slope is 53 degrees from the horizontal. ... · It is widely used around the globe and generally accepted as the standard method of creating safe final pit slopes for open pit mining. ... rigs taking care of the production hole drilling. Here, 165 mm presplit holes are drilled at 20 degree angles on 33 m double benches. The holes are spaced 1.8 m apart and are fired just ahead of the ... · It is widely used around the globe and generally accepted as the standard method of creating safe final pit slopes for open pit mining. ... rigs taking care of the production hole drilling. Here, 165 mm presplit holes are drilled at 20 degree angles on 33 m double benches. The holes are spaced 1.8 m apart and are fired just ahead of the.

Surface mining planning and design of open pit mining

The South African Institute of Mining and Metallurgy ... bench stack angle that satisfies the stability criteria, various combinations of bench height, bench face angle and berm width can be used in the slope design. ... analysis and numerical modelling methods, and is not within the scope of this paper. Individual bench stacks, which are ...Excerpt of 70 minute Double Benching video Created for One Key Resources, used by BHP Billiton. Mining Animation

A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face. · It is widely used around the globe and generally accepted as the standard method of creating safe final pit slopes for open pit mining. ... rigs taking care of the production hole drilling. Here, 165 mm presplit holes are drilled at 20 degree angles on 33 m double benches. The holes are spaced 1.8 m apart and are fired just ahead of the ...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.

USA

Bench method stepwise excavation, depth of 2.5D, surrounding rock permeability coefficient of 3.0 × 106cm/s, 3.0 × 10-5cm/s or 3.0 × 10-4cm/s. Saturation and dry Bench method stepwise excavation, depth of 2.5D, surrounding rock permeability coefficient of 3.0 × 10-6cm/s, saturation or dry. Note D was the width of the double-arch tunnel. 3. · However such a small catch bench would be ineffective in catching ravelling rock. If one double benched (i.e. left a catch bench every 10m instead of every 5m), then the calculated catch bench width would be 4.8 metres. If one triple benched (i.e. left a catch bench every 15m), then the recommended width would be 7.1 metres.A method and apparatus for bench mining employs a rotating wheel excavator with excavator wheel positioned outwardly to one side of a tractor unit for the excavator so that the tractor unit draws the excavation wheel along a bench line or cut line between different layers of the bench mine. The cutting wheel can either be moved to opposite sides of the tractor unit or a second wheel can be.

Haul Road Design Guidelines

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. ...In large diameter blastholes in bench mining, an ANFO charge may have a 10 m column, and its VOD of 4 000 m/s. If this charge is bottom primed, the stemming and the top part of the burden are not affected by the detonation until 2.5 ms after initiation. ... for side-cast blast and Ring-blast this method of double-priming is very advantageous to ...Temporary haul roads and on-bench roads should be maintained at a minimum of the 3.5 x the width of the largest vehicle using the road. If the road width is excessive, the time spent grading and watering for dust suppression is non-productive and expensive. Anything less than this introduces safety risks and unnecessary production losses.

Surface mining planning and design of open pit mining

surface mining by S.G. Ercelebi*, and A. Bascetin† Synopsis In surface mining operations, truck haulage is the largest item in the operating costs, constituting 50 to 60% of the total. In order to reduce this cost, it is necessary to allocate and dispatch the trucks efficiently. This paper describes shovel and truck operation models · Working Bench, Catch Bench Catch Bench Geometry H&K p. 252 & following Bench facts: 1. face angle varies from 55o -80o 2. most important design component for a. optimisation b. equipment selection c. production planning 3. types a. working bench b. safety bench c. double bench Working Bench Typical Berm Design Double … · Basic Concept 1.2) Open pit Mining method 1.3) Bench 1.4) Open Pit Bench Terminology 1.5) Bench height 1.6) Cutoff grade 1.7) Open Pit Stability: i) Pit slope ii) Pit wall stability iii) Rock strength iv) Pit Depth v) Pit diameter vi) Water Damage vii) Strip Ratio (SR) 1.8) Open-pit mining sequence 1.9) Various open-pit and orebody.

Coal mining

In large diameter blastholes in bench mining, an ANFO charge may have a 10 m column, and its VOD of 4 000 m/s. If this charge is bottom primed, the stemming and the top part of the burden are not affected by the detonation until 2.5 ms after initiation. ... for side-cast blast and Ring-blast this method of double-priming is very advantageous to ...Sloping a method of protecting employees from cave­ins by excavating to form sides of an excavation that are inclined away from the ... For simple bench systems in TYPE A soil and a trench depth of less than 20 feet, the steepest maximum allowable slope is 53 degrees from the horizontal. ...Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is called a 'pit.

mining engineering: MINE DESIGN : BENCHING

Bagdad's Pit-Mining Method Bench~s are established at 45- and 50-foot vertical intervals. Stripping of waste starts at high elevations on the sides of Bagdad Canyon. Ore, waste and low-grade are broken by 7" churn drills, loaded by electric shovels.Solution mining includes both borehole mining, such as the methods used to extrac t sodium chloride or sulfur, and leaching, either through drillholes or in dumps or heap s on the surface. 2 ... · Working Bench, Catch Bench Catch Bench Geometry H&K p. 252 & following Bench facts: 1. face angle varies from 55o -80o 2. most important design component for a. optimisation b. equipment selection c. production planning 3. types a. working bench b. safety bench c. double bench Working Bench Typical Berm Design Double benching ? Triple benching ?.

Blaster's Training Modules

 · All things considered, double-side loading has the potential to add significant value to an operation provided the mining constraints can accommodate the loading method. A case study implementing the two loading methods was conducted to determine the economic and productivity benefits of each option.Bagdad's Pit-Mining Method Bench~s are established at 45- and 50-foot vertical intervals. Stripping of waste starts at high elevations on the sides of Bagdad Canyon. Ore, waste and low-grade are broken by 7" churn drills, loaded by electric shovels.diameters, d, in inches, matched to bench height, H, in feet. Bench Height feet 3 3.5 4 4.5 5 5.5 6 6.25 6.5 6.75 7 7.88 9 9.88 10.6 12.3 13 15 16 3 7 10 13 16 20 23 26 30 33 36 39 43 46 49 52 56 59 62 66 69 72 75 79 82 Hole Diameter in Inches A common method for ….