May 5 (Reuters) - Enerplus Corp ERF.TO
* Enerplus announces first quarter 2017 results
* Q1 earnings per share c$0.32
* Enerplus corp - enerplus is reducing its 2017 operating expense guidance to $6.85 per boe from $7.25 per boe
* Enerplus corp sees fy 2017 capital spending of $450 million
* Enerplus corp - narrowing its expected 2017 average marcellus natural gas sales price differential to us$0.60 per mcf
* Enerplus corp sees q4 average production 86,000 - 91,000 boe/d
* Enerplus corp sees average annual production 81,000 - 85,000 boe/d for fy 2017
* Says q1 2017 production averaged 84,937 boe per day
* Enerplus says q1 total production about 5% lower versus q4 of 2016 due primarily to divestment of non-operated north dakota production in december 2016 Source text for Eikon: ID:nCNWmb6kva Further company coverage: ERF.TO