Underground mining (hard rock) - WikipediaUnderground hard rock mining refers to various underground mining techniques used to . The path is defined as 'Decline' as describe above. .. In some cases the underground primary crusher feeds an inclined conveyor belt which delivers.definition of an underground crusher,Primary Crusher Underground - DIAB EngineeringDiab is constructing the second underground crushing circuit for the Argyle Underground Project. The contract is a turnkey project meaning that it includes civil.
definition of an underground crusher