Historical clue formulations

• Southwest landform — 2025-11-02
• Montana city nicknamed "The Richest Hill on Earth" — 2024-10-15
• Isolated hill — 2022-07-03
• Montana mining city — 2020-03-12
• Isolated hill — 2018-10-14
• Crested ___ (Colorado ski resort) — 2018-01-14
• Montana city that consolidated with Silver Bow County — 2017-01-25
• Monument Valley sighting — 2016-08-14
• City that sounds like a humdinger? — 2014-04-20
• Montana mining city — 2013-03-19
• Crested ___, Colo. — 2011-04-10
• Isolated hill — 2010-03-15
• Home of the World Museum of Mining — 2009-04-24
• Birthplace of Evel Knievel and Martha Raye — 2007-10-13
• Montana city — 2004-03-03
• Seat of Silver Bow County — 2003-06-06
• Seat of Silver Bow County — 2002-09-14
• Site of Hellroarin' Gulch — 2002-05-17
• Geological formation — 1999-11-26
• Montana metropolis — 1999-09-13
• Evel Knievel's hometown — 1998-07-04
• Montana city — 1997-09-01
• Isolated hill — 1997-07-18
• Montana city — 1996-08-19
• Montana city — 1995-10-09
• Big Sky Country city — 1994-03-11
• Western mining center — 1993-11-28