Portable Rock Crusher - Gold Mining Equipment - - AmazonByJeffrey BLumon October 20, 2015. Verified Purchase. This rock crusher does a fine job. It will crush small 2 in. X 2in. rocks into dust in a matter of a minute.buy rock crusher,Cheap Rock Crusher from Home Depot. $12.77Jul 13, 2011 . This was my answer to a quick portable mortar and pestle.