Mining in India Wikipedia
Flint was known and exploited by the inhabitants of the Indus Valley Civilization by the 3rd millennium BCE. P. Biagi and M. Cremaschi of Milan University discovered a number of Harappan quarries in archaeological excavations dating between 1985–1986. Biagi (2008) describes the quarries: ''From the surface the quarries consisted of almost circular empty areas, representing the quarry–pits ...