Historical clue formulations

• Silver streaks, e.g. — 2023-05-20
• Rock veins — 2023-04-23
• Rich sources — 2022-08-14
• Mine locales — 2021-09-16
• Good things to strike — 2021-06-23
• Prospectors' finds — 2020-09-20
• Prospectors' prospects — 2019-02-08
• Rich ore sources — 2017-09-18
• Claim deposits — 2017-09-17
• Valuable deposits — 2015-11-13
• Silver streaks — 2015-09-03
• Metallic veins — 2013-05-01
• Bonanzas — 2012-04-06
• Mined finds — 2011-09-22
• Veins — 2007-03-31
• Things that are picked — 2005-05-08
• Valuable veins — 2004-10-29
• Prospecting bonanzas — 2004-07-07
• Valuable deposits — 2003-04-06
• Prospector's dreams — 1999-09-05
• Rich veins — 1996-04-08
• Rock groups — 1994-10-06
• Deposits — 1994-02-06