There's a Stephen Baxter novel from a quarter of a century ago [1] in which an antimatter meteorite falls to earth, and via undisclosed handwaving, ends up as a deposit in the Antarctic, which is subsequently mined to provide a source of power for various steampunk shenanigans:

https://www.thebooksmugglers.com/2010/04/steampunk-week-book...

[1] yikes