First published by Money Metals here: https://www.moneymetals.com/news/2019/04/16/worlds-largest-primary-silver-miner-production-plunges-001756

Silver production at the world’s largest producer fell significantly in the first quarter of the year. Fresnillo PLC reported a decrease in silver production in Q1 2019 versus the same period last year, due to lower ore grades and reduced volumes of processed ore at its Fresnillo Mine.