April 21 (Reuters) - Santos Ltd STO.AX :
* 2016 first quarter activities report STO.AX
* Q1 sales 21.3 mmboe versus 15.2 mmboe a year ago
* Q1 production 15.6 mmboe versus 14.0 mmboe a year ago
* 2016 production guidance of 57-63 mmboe is maintained
* 2016 guidance is maintained
* Q1 sales revenue $835 million versus $825 million a year ago
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