BRIEF-Golden Star preliminary Q1 cash operating costs estimated at below $750/ounce
April 13 (Reuters) - Golden Star Resources Ltd
* Preliminary cash operating costs for Q1 are estimated at below $750 per ounce, lower than expected
* Says Q1 production exceeded expectations with about 53,000 ounces of gold produced
* Received $20 million from RGLD Gold AG , a subsidiary of Royal Gold , Inc., on April 1, 2016
* Development of PRESTEA underground project continues and is on track to commence production in mid-2017 Source text for Eikon: Further company coverage: (Bengaluru Newsroom: +1 646 223 8780)
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