Ore
From Salem Wiki
Ore can be either Iron Ore or Copper Ore
About
An intermediary resource required by chipping away at an Iron Ore Boulder or Copper Ore Boulder.
Iron ore has silver streaks and copper has orange.
Bar of Iron or Bar of Copper is smelted from this by putting it into an Ore Smelter. Ore can not be used as a replacement for stone.
For the full process, see Mining.