The waste is thrown back into the pits. As regards to the reef ores, holes of 0. These holes are with a spacing of about 0.
Detailed Product Specifications
The blasted broken ore is manually screened, stacked for loading in dumpers for dispatch. Most of the large iron ore mines are mechanized mines. In these mining is done to extract iron ore from surface deposits. In these mines all the operations are mechanized and mining is invariably done through systematic formation of benches by drilling and blasting.
Mining process The recovery of material is done from an open pit in the ground. Overburden consisting of surface vegetation, soil and rock material is removed stripped to reach buried ore deposits. Overburden is continually removed during the life of the mine as the high wall is cut back to permit deepening of the pit.
In the process of mining ore benches are developed for the purpose of drilling, blasting and hauling of the ore to the crushing plant. The height of the benches is dependent on several factors such as output requirement, shape, size and depth of occurrence of ore body, geological disturbance suffered by the ore body, hardness and compactness of the ore body, type and the size of deployed for the mining operations etc.
The length of the face is dependent on various factors such as contours of deposit, output required, variation in grade, blending requirements and capacity of loading machinery etc.
The width of the bench is governed to a large extent by the size of the largest machinery deployed. Drilling in the benches of open pit mining is done for production of iron ore with mechanized drills specific for each mining method.
The main objective of drilling operations is to create a hole of suitable diameter, depth and direction in rock for explosives to be placed for blasting activities. The drilling of the holes is done normally in a particular pattern which depends on the bench height, the diameter of the hole, the drilling machinery deployed, nature of rock and the types of explosives used.