Rock Crushing methods and How to recover gold from Ores
A slightly different version of mortar and pestle work is a variety called hand stamp crushing. A heavy cylinder of iron is welded to a long rod and placed inside a pipe or tube which is just a bit larger than the diameter of the iron cylinder.
Mortar and pestle - Wikipedia
Mortar and pestle are implements used since ancient times to prepare ingredients or substances by crushing and grinding them into a fine paste or powder in the kitchen, medicine and pharmacy. The mortar ( / ˈ m ɔːr t ər / ) is a bowl, typically made of hard wood, metal, ceramic, or hard stone, such as granite.