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This paper discusses the results from a complex laboratory studies, carried out on the lead-zinc ore from Madan ore field deposits. The Pb-Zn ore is currently processed in Rudozem concentrator, involving a sequence of three stage crushing, followed by ball mill grinding and selective lead-zinc flotation circuit. Two properties from the laboratory grinding tests were investigated: mineral liberation characteristics (batch grinding tests) and Bond ball mill work index (kWh/t). In order to determine the correlation b...