Taupānga:Ringa poutū rōnaki tiketike mākū mīhini whakawehe autō kua whakamahia whānuitia i roto i te wehenga mākū mō te ore autō konganuku ngoikore pērā i te hematite, limonite, siderite, chromites, limonite, wolfram etc me te wehenga rino mo te purenga o te kohuke konganuku kore, pērā i te kiripaka. , feldspar, nightline, fluorite, kaolin etc.