Historical clue formulations

• Rocks smelted to make steel — 2026-07-05
• Smelter's material — 2022-10-11
• Shipment to a mill — 2020-11-21
• Raw material for steel — 2020-10-20
• Hematite, e.g. — 2018-08-05
• Major export of Western Australia — 2016-10-01
• Raw material for a steel mill — 2012-04-23
• Major export of Brazil and Australia — 2011-09-10
• Resource of western Australia — 2011-04-15
• Mesabi Range export — 2011-03-13
• Raw material for a steel factory — 2010-03-08
• Shipment to a steel mill — 2007-12-17
• Turgite or limonite — 2007-06-16
• Smeltery input — 2006-11-07
• Minnesota resource — 2006-08-19
• Cargo on the ill-fated Edmund Fitzgerald — 2006-04-16
• Magnetite, for one — 2005-11-27
• Refined find — 2005-02-05
• Siderite, for one — 2004-11-24
• Taconite, e.g. — 2004-11-06
• Mesabi Range wealth — 2004-10-31
• Steel factory input — 2004-05-02
• Picked-out material? — 2003-12-06
• Mined find — 2002-04-07
• Taconite or siderite — 2002-02-08
• Blast furnace input — 2000-10-20
• It might be picked out — 2000-08-04
• Mesabi yield — 2000-02-05
• Taconite, e.g. — 1997-04-11
• Magnetite, e.g. — 1997-03-20
• Mesabi Range wealth — 1996-04-12
• Magnetite, e.g. — 1995-03-29