Coal mining is the process of extracting coal from the ground. Coal is valued for its energy Coal-cutting machines were introduced in the 1880s. By 1912 Surface mining and deep underground mining are the two basic methods of mining.
Mining is the extraction of valuable minerals or other geological materials from the earth, . The Romans used hydraulic mining methods on a large scale to prospect for the veins of ore, At other parts of the site, they penetrated the water table and dewatered the mines using several kinds of machines, especially reverse