Here's the USGS 2023 Mineral Commodities Summary for Selenium. https://pubs.usgs...

		pfdietz on Oct 28, 2023 \| parent \| context \| favorite \| on: Sulfur selenium solid-state battery from NASA brea... Here's the USGS 2023 Mineral Commodities Summary for Selenium. https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-selenium.p... World production for 2022: 3,200 tonnes World reserves: 81,000 tonnes There's not a whole lot available. It occurs at 0.5 to 12 ppm in coal, so large amounts of coal ash might be a future resource. It's not economic to extract that now, vs. current secondary extraction from copper anode slimes.

I will add that the concentration of Se in carbonaceous chondrites is around 20 ppm. Eventually we might mine asteroids for it.