History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c12.s2.5
History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c12.s2.5
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v1.c12.s2.5
Pillars were left to support the stopes and weak backs were supported by timber. Evidences of extraction of pillars and planned retreat mining are also available, for example, at Zawar.