April 13 (Reuters) - Golden Star Resources Ltd GSC.TO
* 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
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