Hard Rock Crushers & Mills — Appropriate Process TechnologiesThe APT range of hard rock crushers are designed to provide complete, low cost hard rock crushing and . need optimum solutions, with low capital and start-up mining requirements. For optimal rock crushing, this range incorporates Jaw Crushers (JC) and RD Wet Impactors (RD), . Small Standalone Hard Rock Crushers.small stone crusher for mining,Jaw Crushers - Mt Baker Mining and MetalsThey take large pieces of rock, ore, concrete, or other materials, and crush them down to smaller sizes, for further processing in a ball or hammer mill, or for use.