Finlay Jaw Crusher proves it's worth in manganese mining. 3/9/2021· Finlay Jaw Crusher proves it's worth in manganese mining. By PE Staff September 3, "We took the mine's management to see a Finlay J1175 Jaw Crusher working on a nearby iron ore mine where it was tasked with crushing very hard quartzite rock and on the strength of that machine's Type above and press .