History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.39
History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t4.39
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v1.c13.s2.t4.39
Evidences have been found of mining even at a depth of more than 10m.