First published by Money Metals here: https://www.moneymetals.com/news/2019/03/22/us-silver-production-lowest-70-years-001739

With the latest release by the USGS, silver production in the U.S. is now the lowest in more than 70 years. We have to go all the way back until the year after World War II ended to see U.S. silver production less than it was in 2018. While many reasons can be attributed to the decline, the main factors are falling ore grades and mine economics.