Historical clue formulations

• Like bismuth and bitcoin — 2025-08-16
• Dug up — 2024-07-10
• Produced, as digital currency — 2023-01-07
• Like much data — 2019-06-28
• Drew useful material from — 2017-04-02
• See 38-Across — 2015-07-10
• Like some enemy waters in wartime — 2015-06-28
• Like 19-Across — 2014-08-08
• Like diamonds and gold — 2014-05-31
• Got out of the ground — 2011-03-31
• Extracted ore — 2010-07-26
• Dug — 2008-12-23
• Dug up — 2005-08-24
• Sought salt — 2004-11-17
• Dug up — 2004-02-09
• Got the lead out? — 2000-06-10
• Like enemy waters, maybe — 1998-07-31
• Found a vein — 1995-06-01