Iron ore
From Cantr II Wiki
Iron ore is created by starting a hematite, magnetite or taconite crushing project on a stone table or work bench. You will be able to produce 525, 540 or 487 grams of ore a day, and it will require the use of 750 grams of hematite, magnetite or taconite.
Either a type of hammer:
or a type of sledgehammer:
must be in your inventory at the time of working on the project. However, there are separate projects for each tool, so one may not help on a hematite crushing project designed for hammers, while using a sledgehammer. A sledgehammer works at twice the speed as a hammer.
Used in a smelting furnace or primitive smelting furnace with limestone and coal, charcoal or propane to make iron.