Possible Clues:

• Haematite, for example
• Steel mill delivery
• Ferriferous mineral
• Working men in rage smelt this
• Metal in its raw form
• Crude stuff written in biro? No really!
• Rock or mineral from which a hard magnetic metal can be extracted
• Haematite obtained from robust seaweed
• Major export of Western Australia
• Taconite or siderite