I’ve made a Scenario to mine Koppranickel Sand and then swap to arm and craft High Steel Nuggets.Fully tested got both my profs to around 64 in one night and Profit! The scenario is set up to auto repair at an NPC so you can run it as long as you want without fear of your gear breaking. If you just want to farm the sand you can delete the second chapter. Enjoy.
Looks nice, but in my case when I try to craft it search for recipe and tries to use blacksmith one instead of armorers