History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c17.s4.t2.11

v1.c17.s4.t2.11

The slag dump area also showed several cylindrical retort-like pieces with inside coating of dirty white ZnSO4 and slag assaying 0.01 p.c. zinc and as high as 9.30 p.c. lead. Considering the fact that the ore-body assays 12p.c. Zn and 2-3 p.c.Pb, Paliwal et al (1986) rightly inferred that an appreciable amount of zinc must have been recovered by retort distillation process which was perfected in the Zawar Mines.