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 hammer (stone, bronze or regular hammer) or sledgehammer must be in your inventory at the time of working on the project, and either one works just as well as the other. 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.
Used in a smelting furnace or primitive smelting furnace with limestone and coal, charcoal or propane to make iron.