First published by Money Metals here: https://www.moneymetals.com/news/2017/08/07/primary-silver-production-plummets-001131

In an interesting change of events, production at four of the top primary silver miners plummeted during the second quarter of 2017. This goes well beyond normal fluctuations in mining companies production figures during different quarterly reporting periods. The company with the least percentage decline in silver production still suffered a 20% reduction of mine supply in the second quarter.