Opencast Mining (Quarrying): Methods, Advantages & Disadvantages
Small drilling machines, drilling 1.2 m to 1.8 m deep holes, 37 mm diameter, are used and the holes are blasted with gun-power or other explosives. The overburden and mineral are manually loaded into tubs which are hauled by rope haulages or locomotives. ... Method (a) is used in a small quarry where the output is only 50 to 100 te of coal per ...
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