12 October 2017

                                   Acacia Mining plc                               

                                        LSE:ACA                                    

                              ("Acacia" or the "Company")                          

                       Third Quarter Production and Sales Update                   

    Acacia notes Barrick Gold Corporation's ("Barrick") announcement yesterday
    evening that it would be publishing its third quarter production and sales
    results, which will include Barrick's 63.9% share of Acacia's operations, later
    today. Ahead of that release Acacia confirms that it produced 191,203 ounces of
    gold and sold 132,787 ounces of gold during the third quarter.

    Production was ahead of expectations at Buzwagi (69,097 ounces), driven by
    strong grades, with production at North Mara (72,011 ounces) and Bulyanhulu
    (50,094 ounces) impacted, as previously flagged, by work permit issues and
    moving to reduced operations respectively. Sales were below production due to
    the ban on the export of gold/copper concentrate produced at Bulyanhulu and
    Buzwagi from Tanzania.

    Acacia will provide more details within our third quarter results on the 20th
    October 2017. The results will be accompanied by a conference call for
    investors and analysts at 09:00 BST on the same day.

    The access details for the conference call are as follows:

    Participant dial in:             +44 20 3059 8125

    Password:                           Acacia Mining

    A recording of the conference call will be made available on the Company's
    website, www.acaciamining.com, after the call.

    ENQUIRIES

    For further information, please visit our website: www.acaciamining.com or
    contact:

    Acacia Mining plc
                                                                                              
                                    +44 (0) 20 7129 7150

    Giles Blackham, Investor Relations  

    Camarco                                                                                                                                             
    +44 (0) 20 3757 4980

    Gordon Poole / Billy Clegg / Nick Hennis