The four deposits at Zawar Group are hosted by low grade metamorphosed sediments consisting of greywackes, phyllites, dolomites and quartzites that unconformably overlay the Pre-Cambrian basement. The lead-zinc-pyrite mineralisation is strata bound and occurs as vein-stringers reflecting the high level of fractures within the more competent dolomites. There are multiple ore bodies that are complex in some areas as the lenses split and enclose waste rock. The ore bodies are steeply dipping.

Zawar consists of four mines namely, Mochia, Balaria, Zawar Mala and Baroi.

Zawar group of mines are located about 40 kilometres south of Udaipur, in the state of Rajasthan in India. Zawar is very well connected with roads. Power requirement is adequately sourced from its 80 MW coal based captive thermal power plant.

Lead –Zinc ore is divided into stope blocks which are drilled and blasted using long hole open stoping mining method. Ore is either crushed to underground or at surface to feed mill. A backfill and a paste fill plants were recently completed to use tailings from ore beneficiation plants. The mine also has a dry stack tailing plant, the first of its kind in India.

Ore processing is carried out in a conventional comminution and flotation plant having facility for “differential” as well as “bulk flotation” of zinc and lead metals. The ore is crushed primarily underground and then hoisted to the surface. Thereafter, the ore is crushed to 12 to 15mm in size before being milled to 74 microns. In the differential flotation process, milled ore is conveyed separately to two lead flotation circuits and undergoes a process incorporating roughing, scavenging and cleaning. Lead flotation tails proceed to two zinc flotation circuits comprising roughing, scavenging and cleaning. Zinc flotation tails are disposed in slurry form in designated tailings disposal area. Lead and zinc concentrates are thickened, filtered and then stored before they are sent to HZL’s smelters. In the bulk flotation process, milled ore is conveyed to the flotation circuit and undergoes a process incorporating roughing, scavenging and cleaning. Final bulk concentrate is thickened, filt ........