Sierra Metals (NYSE:SMTS, TSX:SMT) announced full year 2021 production results. Unprecedented COVID-19 operational challenges impacted production for the year.Consolidated copper equivalent production of was 89.9 million pounds; a decrease of 24% from 2020.Sierra Metals trades at a deeply discounted valuation multiple relative to its copper peers across all metrics; and has a dividend yield of 2.2% vs. the S&P 500 dividend yield of 1.2%.