Metal ores are formed in the process of ore genesis, and they are extracted through mining. Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form. Hydrometallurgy uses aqueous solutions to extract metals from ores ( leaching ).
Iron pyrites, or fool's gold, cannot be used to make iron because of its high sulphur content which makes the iron too brittle. Although the early iron industry used "bog ore" to obtain iron, ironstone is the most common iron ore and it is extracted from open cast (surface) sites in .