BRIEF-Sierra Metals qtrly silver equivalent production of 2.6 mln ounces
April 21 (Reuters) - Sierra Metals Inc
* Sierra metals reports first quarter 2016 production results
* Qtrly silver equivalent production of 2.6 million ounces; a 19% decrease from q1 2015
* Qtrly copper equivalent production of 17.2 million pounds; a 19% decrease from q1 2015 Source text for Eikon: Further company coverage: )
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