Hardness and grindability determine the kinds of equipment used for mining, crushing, and grinding coals in addition to the amount of power consumed in their operation.
Also during the mining, crushing and washing of ore, huge quantities of fines are generated, majority of which end up into tailing ponds owing to their high alumina contents (∼10 15%).
Similar considerations apply to systems for oil shales where mining, crushing, ash-forming mineral removal, but most importantly the liberating heating (or "retorting") process are applied.
We should be free from tyranny - socialized medicine, forced vaccines, government intrusion, data mining, crushing business regulations, racial pot-stirring, and cameras everywhere.
Mountains of facts are mined, crushed and consumed as narrative fuel.
Tons of the pebbly conglomerate had to be mined, crushed, amalgamated with mercury (later cyanide), and retorted in order to produce even an ounce or two of gold.
In open-pit mining, the most controversial mining technique, crushed ore is removed, soaked in chemicals such as cyanide and mercury, and after the "slurry" is removed, the contaminated water is often returned to the water table from which it came.
As Thatcherism closed the mines, and crushed the unions in the 1980s, a wave of new Scottish writers dealt with the fallout of unemployment and urban decay.
In the ore-dressing plant, the material received from the mine is crushed in several stages and finely ground to a size which ensures that copper minerals are liberated from the waste materials, or gangue.
Samples for geochemical analysis in Xiaoyugou mine were crushed and ground to less than 200 mesh.
