Problem 14: An underground hard rock mine operation employs a 8 -m3 skip with an 14-tonne capacity to hoist ore to the surface. The blasted ore passes through the crusher to obtain small fragment size before loading of the skip takes place. The crushed ore is moist and has the following properties: Dry bulk density = 2300 kg/m3 Water content = 16% The mine is considering running the operation without the crusher. This means that the blasted ore of considerably larger size will be loaded directly into the skip. The blasted ore is moist and has the following properties: Dry bulk density = 1750 kg/m3 Void ratio = 0.75 Degree of saturation = 22% (a) Determine the wet bulk density of the crushed ore. (b) Determine the wet bulk density of the blasted ore.
Problem 14:
An underground hard rock mine operation employs a 8 -m3 skip with an 14-tonne capacity to hoist ore to the surface. The blasted ore passes through the crusher to obtain small fragment size before loading of the skip takes place. The crushed ore is moist and has the following properties:
Dry bulk density = 2300 kg/m3 Water content = 16%
The mine is considering running the operation without the crusher. This means that the blasted ore of considerably larger size will be loaded directly into the skip. The blasted ore is moist and has the following properties:
Dry bulk density = 1750 kg/m3
Void ratio = 0.75
Degree of saturation = 22%
(a) Determine the wet bulk density of the crushed ore.
(b) Determine the wet bulk density of the blasted ore.
(c) Determine if the hoisting productivity of the skip will be affected by this change.
(d) Estimate the bank weight of the rock using a % swell of 40%.
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