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Working Bench, Catch Bench Catch Bench Geometry Hamp;K p. 252 amp; 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
The bench face angle and berm width geometries must be chosen to fit the bench stack angle but must provide a berm that will be capable of catching the volume of failed wedge material from the bench faces above. Other considerations for bench height and berm width are equipment size, ore selectivity and blasting design.
height, bench face angle and berm width can be used in the slope design. All geometrical pit slope elements referred to here are illustrated in Figure 1. The bench height, bench face angle and berm width geometries must be chosen to fit the BSA but must provide a berm that will be capable of
surface mining methods; open pit planning and design; Berm interval, berm width and. The width being extracted from the working bench is called the cut.
Gibson, WH, de Bruyn, IA amp; Walker, DJ 2006, Considerations in the optimisation of bench face angle and berm width geometries for open pit mines, Proceedings of the International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering, The Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 557578.
#0183;#32;Surface mining planning and design of open pit mining 1. This Geometry of a Working Bench Shovel Truck Width Backup Truck Truck Turning radius Berm width Shovel Length A bench big enough To accommodate Equipment working is Much wider
Dilution versus bench height (Bozorgebrimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as depositrelated or minerelated. The bench height is a minerelated parameter that can be studied using a simple geometrical model of
Berm Impact Zone Double Bench 1 m 69#176; Foliation Drilling Offset m m Effective Bench Face Angle = 60#176; Actual Bench Face Plane 11 m Backbreak Interramp slope angle = 46#176; Figure 2 Original doublebench and catch bench design for the northern footwall sector at
Mining Engineering Committee Members: Erik C. Westman, Chair Mario G. Karfakis RocFall analysis showed that 20 ft benches with a 4 ft berm will hold over 95% of rockfalls, that come into play in the design of the bench width are numerous, making for a difficult problem. Geology, blasting, safety, pit design
S Coetsee Reutech Mining, South Africa. The empirical derivation of the minimum berm width and the formulae presented by the various design criteria are different due to the input parameters selected, thus resulting in a range of minimum berm widths that can be calculated for the same set of rock mass and geometric conditions.
#0183;#32;Therefore, catch bench width is one of the important considerations when designing bench geometry. To improve the functionality of the catch bench, a berm is added at the edge of the bench, to increase the retaining capacity of the catch bench. Moreover, the berm can provide safety for mining vehicles used in the clearance of fallen rock fragments.
Design of Surface Mine Haulage Roads A Manual Haulageway Width bottom, and side dump trucks, by virtue of their function within the mining operation, are the most frequent haulage road users. Due to their extreme weight and normally high operating speeds in relation to other equipment, their
Considerations in the optimisation of bench face angle and berm width geometries for open pit mines, in Proceedings of The South African Institute of Mining and Metallurgy International Symposium on Stability of Rock Slopes, Symposium Series S44 Stability of rock slopes in open pit mining and civil engineering situations, pp. 557 579.
The width of the drill berm can possibly be eliminated by drilling the entire double bench or using smaller drills. Sometimes one may see the term geotechnical berm. In some pit designs a large bench is introduced periodically, every 120m180m in height,
When Mining Engineers want to create a ramp for a pit design, whether along the pit boundary or along intermediate strips, the ramp parameters they need to consider for the design include ramp gradient, ramp width, ramp and berm intersection criteria and switch back details, amongst others.
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