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METALS :fire:, CONDUCTORS: CONDUCTORS, IRONWORKS: IRONWORKS, MAGNETIC:…

- - - - SURFACE MINES
      - UNDEGROUND MINES
    - - SEPARATE ORE FROM GANGUE
        
        PHYSICAL
      - MAKE METAL FROM ORE (IRONWORKS)
        
        PHYSICAL / CHEMICAL
        
        IRONWORKS: a place where iron is smelted or iron goods are made.
    - - GANGUE (USELESS)
      - ORE (USEFUL)
- - - - join together by heating the surfaces to the point of melting. .
  - - - a reddish- or yellowish-brown flaking coating of iron oxide formed on iron by oxidation