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Backfilling of stopes is performed by utilization of Cavo 310 load and haul machine. Maximum backfilling transportation distance is illustrated in Figure 24 and is around 125m at the level L+1600m.

Figure 24 Longest backfill distance

Volume of material that has to be installed in the stope:

$$V=w\cdot h\cdot {{l}_{bh}}=3\cdot 2.5\cdot 1.6\approx 12{{m}^{3}}$$


W – width of stope (3m)

h – height of stope (2.5m)

lbh – length of blasthole (1.6m)


Total number of cycles necessary to transfer this amount of ore to the ore pass is:

$${{N}_{c}}=\frac{12{{m}^{3}}}{{{V}_{cb}}\cdot 0.9}=\frac{12}{1\cdot 0.9}\approx 14 cycles$$


Vcb – Volume of Cavo 310 body (1m3)



Loading of Cavo 310 with backfill material takes following time:

$${{T}_{l}}=\frac{{{V}_{cb}}\cdot 0.9}{{{V}_{b}}}\cdot {{t}_{l}}=\frac{1{{m}^{3}}\cdot 0.9}{0.13{{m}^{3}}}\cdot 15s\approx 100s$$


Vcb – Cavo 310 body volume

Vb – bucket volume

tl – time for loading of one bucket



Total driving time can last up to:

$${{T}_{D}}=\frac{{{L}_{T}}}{\upsilon }=\frac{2\cdot 125m}{1m/s}=250s$$


LT – maximum total driving distance (2 x 125m see Figure 24)

$\upsilon$ – driving velocity (1m/s)


For dumping, maneuvering and all unexpected pauses 40s is left within each cycle and therefore total duration of one loading and hauling cycle is:

$${{T}_{BFC}}=250s+100s+40s=390s\approx 6.5\min \to 7\min $$

Total duration of backfilling of one stope takes up to:

$${{T}_{BF}}={{T}_{BFC}}\cdot {{N}_{c}}=7\min \cdot 14=98\to 100\min $$


Table 3 Gantt chart for backfilling


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