OC design fundamentals

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Open Pit Mine Planning &Design - Fundamentals :

Open Pit Mine Planning &Design - Fundamentals

Slide 2:

2 Parts of a bench Geometrical Considerations Cumulative frequency distribution of measured bench face angles (Call, 1986).

Slide 3:

3 Section through a working bench. Functioning of catch benches. Geometrical Considerations

Slide 4:

4 Double benches at final pit limits. Catch bench geometry (Call, 1986). Typical catch bench design dimensions (Call, 1986). Bench height Impact zone Berm height Berm width Minimum bench width (m) 15 30 45 (m) 3.5 4.5 5 (m) 1.5 2 3 (m) 4 5.5 8 (m) 7.5 10 13 Geometrical Considerations

Slide 5:

5 Safety berms at bench edge Geometrical Considerations

Slide 6:

6 Height of reach as a function of bucket size. Geometrical Considerations

Slide 7:

7 Example orebody geometry. Ramp access for the example orebody. Blast design for the ramp excavation. Geometrical Considerations

Slide 8:

8 Shovel Working Range

Slide 9:

9 Minimum width drop cut geometry with shovel alternating from side to side. Geometrical Considerations

Slide 10:

10 Minimum width drop cut geometry with shovel alternating from side to side. Geometrical Considerations

Slide 11:

11 Isometric view of the ramp in waste approaching the orebody. Diagrammatic representation of the expanding mining front. Geometrical Considerations

Slide 12:

12 Dropcut / ramp placement in ore. Expansion of the mining front. Geometrical Considerations

Slide 13:

13 Plan view of an actual pit bottom Showing drop cut and mining Expansion (McWilliams, 1959). Geometrical Considerations

Slide 14:

14 Extension of the current Ramp close to the pit wall (McWilliams, 1959). Geometrical Considerations

Slide 15:

15 Creating initial access / benches. Shovel cut sequence when initiating benching in a hilly terrain (Nichols, 1956). Sidehill cut with a shovel. Geometrical Considerations

Slide 16:

16 Detailed steps in the development of a new production level. Geometrical Considerations

Slide 17:

17 Parallel cut with drive by. Geometrical Considerations

Slide 18:

18 Parallel cut with the double spotting of trucks. Geometrical Considerations

Slide 19:

19 Parallel cut with the single spotting of trucks. Geometrical Considerations

Slide 20:

20 Time sequence showing shovel loading with single spotting. Geometrical Considerations

Slide 21:

22 Time sequence showing shovel loading with double spotting. Geometrical Considerations

Slide 22:

23 (Continued). Geometrical Considerations

Slide 23:

24 Geometrical Considerations (Continued).

Slide 24:

25 Section and plan views through a working bench. Simplified presentation of a safety berm. Geometrical Considerations

Slide 25:

26 Initial geometry for the push back example. Cut mining from bench 1. Cut mining from bench 2. Geometrical Considerations

Slide 26:

27 Overall slope angle. Safety bench geometry showing bench face angle. Geometrical Considerations

Slide 27:

28 Overall slope angle with ramp included. Interramp slope angles. Geometrical Considerations

Slide 28:

29 Overall slope angle with Working bench included. Interramp angles associated with the working bench. Geometrical Considerations

Slide 29:

30 Overall slope angle with one working bench an a ramp section. Interramp slope angles for a slope containing a working bench and a ramp. Geometrical Considerations

Slide 30:

31 Overall slope angle for a slope containing two working benches. Geometrical Considerations