19 January 2017

    Fourth Quarter Production Report for the three months ended 31 December 2016

    Based on IFRS and expressed in US Dollars (US$)

    Acacia Mining plc ("ACA'') reports fourth quarter production results

    "We are pleased to report strong fourth quarter production of 212,954 ounces,
    which resulted in record full year production of 829,705 ounces, almost 100,000
    ounces ahead of 2015 and above already increased guidance", said Brad Gordon,
    Chief Executive Officer of Acacia. "2016 was the fourth consecutive year of
    production growth at Acacia, which was driven by a record production year at
    North Mara and the highest production year at Bulyanhulu since 2006. The strong
    operational performance during the quarter led to a further build-up in cash of
    US$16 million, representing an increase of US$114 million in net cash during
    2016. We are also pleased to confirm we will extend mining at Buzwagi by six
    months, and it will now continue until the end of 2017 before at least a
    further two years of processing stockpiles. As a result we look forward to
    another strong year and will provide guidance for the year with our preliminary
    results on 14 February."

    Highlights

      * Q4 2016 gold production of 212,954 ounces and gold sales of 209,292 ounces
      * Preliminary Q4 2016 AISC1 of US$952 per ounce sold, after a US$47 per ounce
        credit in respect of share based payments, 5% lower than Q4 2015  
      * Full year 2016 gold production of 829,705 ounces, 13% above 2015, and ahead
        of revised full year guidance of up to 5% above original guidance of
        750,000-780,000 ounces
      * Full year sales of 816,743 ounces, 13% above 2015
      * Preliminary full year 2016 AISC1 of US$958 per ounce sold, 14% lower than
        2015 and towards the bottom of the full year guidance range of US$950-980
        per ounce
      * Cash balance increased by US$16 million to US$318 million, post negative
        indirect tax movements of US$19 million and US$15 million for share based
        incentive costs during the quarter
      * Net cash1 position increased to US$219 million, an increase of US$114
        million during 2016
      * Six month extension of mining at Buzwagi until the end of 2017, which will
        lead to an increase in production compared to 2016 at the operation. 

    Key Statistics                      Three months ended            Year ended    
                                           31 December               31 December    
                                                                                    
    (Unaudited)                             2016        2015          2016      2015
                                                                                    
    Tonnes mined (thousands of             9,644      10,128        38,491    41,390
    tonnes)                                                                         
                                                                                    
    Ore tonnes mined (thousands of         2,584       2,822         9,419    10,311
    tonnes)                                                                         
                                                                                    
    Ore tonnes processed (thousands        2,567       2,413         9,818     9,268
    of tonnes)                                                                      
                                                                                    
    Process recovery rate (percent)*       88.9%       87.5%         88.5%     87.4%
                                                                                    
    Head grade (grams per tonne)*            2.9         3.0           3.0       2.8
                                                                                    
    Gold production (ounces)             212,954     200,723       829,705   731,912
                                                                                    
    Gold sold (ounces)                   209,292     198,617       816,743   721,203
                                                                                    
    Copper production (thousands of        4,255       4,496        16,239    14,981
    pounds)                                                                         
                                                                                    
    Cash cost (US$/ounce)1                   679         728           640       772
                                                                                    
    AISC (US$/ounce)1                        952       1,004           958     1,112
                                                                                    
    Net average realised gold price        1,211       1,107         1,240     1,154
    (US$/ounce)1                                                                    
                                                                                    
    Capital expenditure (US$'000) 2       57,826      42,931       195,898   183,617

    1 These are non-IFRS measures. Refer to page 7 for definitions

    2 Excludes non-cash capital adjustments (reclamation asset adjustments),
    includes finance lease purchases and land purchases treated as long term
    prepayments

    *Reported process recovery rates and head grade for the Group includes the
    impact of tailings retreatment at Bulyanhulu

    Conference call

    A conference call will be held for analysts and investors on 19 January 2017 at
    09:00 London time. The access details for the conference call are as follows:

    Participant dial in:                   +44 (0) 203 003 2666 / +1 866 966 5335
                                                                                 
    Password:                              Acacia                                

    A recording of the conference call will be made available on the Company's
    website, www.acaciamining.com, after the call. For further information, please
    visit our website: www.acaciamining.com or contact:

    Acacia Mining plc                         +44 (0) 207 129 7150                
                                                                                  
    Brad Gordon, Chief Executive Offic                                            
                                                                                  
    Andrew Wray, Chief Financial Officer                                          
                                                                                  
    Giles Blackham, Investor Relations                                            
    Manager                                                                       

       

    Bell Pottinger                            +44 (0) 203 772 2500                
                                                                                  
    Lorna Cobbett                                                                 

    About Acacia Mining plc

    Acacia Mining plc (LSE:ACA), is Tanzania's largest gold miner and one of the
    largest producers of gold in Africa. We have three producing mines, all located
    in north-west Tanzania: Bulyanhulu, Buzwagi, and North Mara and a portfolio of
    exploration projects in Tanzania, Kenya, Burkina Faso and Mali.

    Our approach is focused on strengthening our core pillars; our business, our
    people and our relationships, whilst continuing to invest in our future.

    Acacia is a UK public company headquartered in London. We are listed on the
    Main Market of the London Stock Exchange with a secondary listing on the Dar es
    Salaam Stock Exchange. Barrick Gold Corporation is our majority shareholder.
    Acacia reports in US dollars and in accordance with IFRS as adopted by the
    European Union, unless otherwise stated in this report.

    FORWARD- LOOKING STATEMENTS

    This report includes "forward-looking statements" that express or imply
    expectations of future events or results. Forward-looking statements are
    statements that are not historical facts. These statements include, without
    limitation, financial projections and estimates and their underlying
    assumptions, statements regarding plans, objectives and expectations with
    respect to future production, operations, costs, projects, and statements
    regarding future performance. Forward-looking statements are generally
    identified by the words "plans," "expects," "anticipates," "believes,"
    "intends," "estimates" and other similar expressions.

    All forward-looking statements involve a number of risks, uncertainties and
    other factors, many of which are beyond the control of Acacia, which could
    cause actual results and developments to differ materially from those expressed
    in, or implied by, the forward-looking statements contained in this report.
    Factors that could cause or contribute to differences between the actual
    results, performance and achievements of Acacia include, but are not limited
    to, changes or developments in political, economic or business conditions or
    national or local legislation or regulation in countries in which Acacia
    conducts - or may in the future conduct - business, industry trends,
    competition, fluctuations in the spot and forward price of gold or certain
    other commodity prices (such as copper and diesel), currency fluctuations
    (including the US dollar, South African rand, Kenyan shilling and Tanzanian
    shilling exchange rates), Acacia's ability to successfully integrate
    acquisitions, Acacia's ability to recover its reserves or develop new reserves,
    including its ability to convert its resources into reserves and its mineral
    potential into resources or reserves, and to process its mineral reserves
    successfully and in a timely manner, Acacia's ability to complete land
    acquisitions required to support its mining activities, operational or
    technical difficulties which may occur in the context of mining activities,
    delays and technical challenges associated with the completion of projects,
    risk of trespass, theft and vandalism, changes in Acacia's business strategy
    including, the ongoing implementation of operational reviews, as well as risks
    and hazards associated with the business of mineral exploration, development,
    mining and production and risks and factors affecting the gold mining industry
    in general. Although Acacia's management believes that the expectations
    reflected in such forward-looking statements are reasonable, Acacia cannot give
    assurances that such statements will prove to be correct. Accordingly,
    investors should not place reliance on forward-looking statements contained in
    this report.

    Any forward-looking statements in this report only reflect information
    available at the time of preparation. Subject to the requirements of the Market
    Abuse Regulation or applicable law, Acacia explicitly disclaims any obligation
    or undertaking publicly to update or revise any forward-looking statements in
    this report, whether as a result of new information, future events or
    otherwise. Nothing in this report should be construed as a profit forecast or
    estimate and no statement made should be interpreted to mean that Acacia's
    profits or earnings per share for any future period will necessarily match or
    exceed the historical published profits or earnings per share of Acacia.

    Operating update for the three months ended 31 December 2016

    Gold production for the quarter amounted to 212,954 ounces, a 6% increase on
    the corresponding quarter of 2015 and a 4% increase on Q3 2016. The increase in
    production was predominantly driven by higher grades and recoveries at North
    Mara and increased run-of-mine processing at Bulyanhulu.

    Gold ounces sold for the quarter of 209,292 ounces was 5% higher than Q4 2015.
    Gold ounces sold were 2% lower than gold produced as a result of logistical
    delays related to Bulyanhulu concentrate shipments.

    North Mara gold production of 91,183 ounces was 18% higher than the prior year
    period as head grade increased by 16% compared to Q4 2015 due to the higher
    grade contribution from the Gokona underground mine as well as an increase in
    the open pit mine grade at Nyabirama combined with a resultant 3% higher
    recovery.

    At Bulyanhulu, total production amounted to 79,859 ounces, 2% above Q4 2015.
    Production from run-of-mine processing of 70,808 ounces was 6% ahead of Q4 2015
    as head grade increased by 5% due to an improvement in underground mined
    grades, in combination with a 3% increase in recovery. The increase in
    run-of-mine production was partly offset by a 20% (2,298 ounces) decrease in
    production attributable to reprocessed tailings due to lower head grade and
    resultant lower recovery, partly offset by higher throughput.

    Gold production at Buzwagi of 41,912 ounces was 7% lower than in Q4 2015,
    driven by a 14% lower head grade as a result of ore tonnes being sourced
    predominantly from the lower grade splay areas due to a change in mine
    sequencing, partly offset by higher throughput as a result of improved plant
    performance.

    Total tonnes mined for the quarter were 9.6 million compared to 10.1 million in
    Q4 2015 primarily due to lower waste tonnes mined at Buzwagi. Ore tonnes mined
    of 2.6 million were 8% lower than Q4 2015 mainly due to lower ore tonnes from
    the Nyabirama open pit at North Mara as mining focused on waste stripping of
    the next stage of the pit, partly offset by higher ore tonnes mined at Buzwagi
    as mentioned above. Tonnes processed in the fourth quarter of 2.6 million
    tonnes were 6% higher than the prior year due to improved throughput at Buzwagi
    as a result of good mill performance and improved throughput for reprocessed
    tailings at Bulyanhulu.

    The average grade processed for the quarter was 2.9 grams per tonne which was
    3% lower than the prior year period mainly due to a lower head grade at
    Buzwagi, partly offset by higher head grades at North Mara and Bulyanhulu.

    Copper production for the quarter was 4.3 million pounds, 5% lower than the
    prior year period, mainly driven by lower copper grades at Bulyanhulu and
    Buzwagi combined with lower copper recoveries at Bulyanhulu.

    The cash balance as at 31 December 2016 amounted to approximately US$318
    million, increasing by US$16 million during the quarter. The outstanding
    balance of the debt facility was US$99 million at year end.

    Mine Site Review

    Bulyanhulu

    Key Statistics

                                         Three months ended         Year ended     
                                            31 December             31 December    
                                                                                   
    (Unaudited)                               2016      2015         2016      2015
                                                                                   
    Key operational                                                                
    information:                                                                   
                                                                                   
    Ounces produced            oz           79,859    78,223      289,432   273,552
                                                                                   
    Ounces sold                oz           74,803    79,233      279,286   265,341
                                                                                   
    Cash cost per ounce sold1  US$/oz          784       653          722       797
                                                                                   
    AISC per ounce sold1       US$/oz        1,061       999        1,058     1,253
                                                                                   
    Copper production          Klbs          1,707     1,774        6,391     6,308
                                                                                   
    Copper sold                Klbs          1,309     1,559        5,570     5,424
                                                                                   
    Capital expenditure2       US$'000      20,017    21,982       84,575   101,292
                                                                                   
    Run-of-mine:                                                                   
                                                                                   
    Underground ore tonnes     Kt              244       292          909       993
    hoisted                                                                        
                                                                                   
    Ore milled                 Kt              263       268          933       983
                                                                                   
    Head grade                 g/t             9.1       8.7          9.3       8.6
                                                                                   
    Mill recovery              %             91.8%     88.8%        91.4%     88.5%
                                                                                   
    Ounces produced            oz           70,808    66,874      254,552   240,044
                                                                                   
    Reprocessed tailings:                                                          
                                                                                   
    Ore milled                 Kt              451       380        1,650     1,368
                                                                                   
    Head grade                 g/t             1.3       1.6          1.4       1.3
                                                                                   
    Mill recovery              %             47.2%     56.6%        45.8%     56.6%
                                                                                   
    Ounces produced            oz            9,051    11,349       34,880    33,508

    1 These are non-IFRS measures. Refer to page 7 for definitions

    2 Excludes non-cash capital adjustments (reclamation asset adjustments),
    includes finance lease purchases and land purchases treated as long term
    prepayments

    Gold production at Bulyanhulu for the quarter was 79,859 ounces, 2% higher than
    the prior year period. This was driven by a 5% increase in run-of-mine
    processing head grade and a 3% increase in recoveries. The increase in
    production attributable to run-of-mine processing was partly offset by a
    decrease in production attributable to reprocessed tailings of 20% due to a 19%
    lower head grade and resultant 17% lower recovery rate, partly offset by higher
    throughput.

    Gold sold for the quarter was 74,803 ounces, 6% lower than the prior year
    quarter and 6% lower than production as a result of logistical delays in
    relation to year-end concentrate shipments.

    For the full year, gold production of 289,432 ounces was 6% above 2015, mainly
    driven by an 8% increase in run-of-mine head grade as underground mining grades
    improved, and a 3% increase in recovery, partly offset by 5% lower throughput
    due to the plant shutdown in Q3 2016. This was in combination with a 4%
    increase in production from reprocessed tailings as a result of increased
    throughput combined with an 8% increase in grade recovered.

    Copper production for the quarter of 1.7 million pounds was 4% lower than 2015
    due to lower copper grades and recovery rates. On a full year basis, total
    copper production of 6.4 million pounds was in line with the prior year.

    Buzwagi

    Key statistics

                                              Three months ended             Year ended     
                                                 31 December                31 December     
                                                                                            
    (Unaudited)                                    2016         2015          2016      2015
                                                                                            
    Key operational                                                                         
    information:                                                                            
                                                                                            
    Ounces produced             oz               41,912       45,196       161,830   171,172
                                                                                            
    Ounces sold                 oz               41,514       41,879       161,202   166,957
                                                                                            
    Cash cost per ounce sold1   US$/oz            1,035        1,101         1,031     1,046
                                                                                            
    AISC per ounce sold1        US$/oz            1,056        1,236         1,095     1,187
                                                                                            
    Copper production           Klbs              2,547        2,721         9,847     8,672
                                                                                            
    Copper sold                 Klbs              2,075        2,160         9,175     7,894
                                                                                            
    Capital expenditure2        US$'000             264        2,741         3,582    12,335
                                                                                            
    Mining information:                                                                     
                                                                                            
    Tonnes mined                Kt                5,090        5,573        21,585    24,989
                                                                                            
    Ore tonnes mined            Kt                1,509        1,432         5,317     5,658
                                                                                            
    Processing information:                                                                 
                                                                                            
    Ore milled                  Kt                1,159        1,060         4,404     4,085
                                                                                            
    Head grade                  g/t                 1.2          1.4           1.2       1.4
                                                                                            
    Mill recovery               %                 94.5%        94.8%         94.5%     94.1%
                                                                                            

    1 These are non-IFRS measures. Refer to page 7 for definitions

    2 Excludes non-cash capital adjustments (reclamation asset adjustments),
    includes finance lease purchases and land purchases treated as long term
    prepayments

    Gold production for the quarter at Buzwagi of 41,912 ounces was 7% below Q4
    2015, driven by a 14% lower head grade as a result of lower mined grades due to
    a change in pit sequencing in order to enhance operational efficiencies in
    2017, partly offset by higher throughput as a result of improved plant
    performance. Gold sold for the quarter amounted to 41,514 ounces, in line with
    the prior year and in line with production.

    Gold production for the full year of 161,830 ounces was 5% lower than in 2015
    due to a 14% decrease in grade as a result of mining the cut back with ore
    primarily sourced from lower grade splay material. This was partly offset by an
    8% increase in throughput due to improved mill availability and improved
    milling rates.

    Copper production of 2.6 million pounds for the quarter was 6% lower than in Q4
    2015 driven by the lower copper grades.

    As previously disclosed, during 2016 we assessed the potential to extend mining
    of the open pit at Buzwagi and as a result now expect this to continue until
    the end of 2017, followed by at least two years of processing stockpiles. We
    will provide more details with our preliminary results in February as part of
    our annual guidance update, but as a result of this extension and focus on the
    higher grade main zone within the pit we expect 2017 production at the mine to
    be in excess of 2016 levels.

    North Mara

    Key statistics

                                       Three months ended 31       Year ended 31   
                                             December                 December     
                                                                                   
    (Unaudited)                               2016       2015         2016     2015
                                                                                   
    Key operational                                                                
    information:                                                                   
                                                                                   
    Ounces produced          oz             91,183     77,304      378,443  287,188
                                                                                   
    Ounces sold              oz             92,975     77,505      376,255  288,905
                                                                                   
    Cash cost per ounce      US$/oz            436        604          410      590
    sold1                                                                          
                                                                                   
    AISC per ounce sold1     US$/oz            850        932          733      915
                                                                                   
    Capital expenditure2     US$            37,144     17,756      106,326   69,016
                             ('000)                                                
                                                                                   
    Open pit:                                                                      
                                                                                   
    Tonnes mined             Kt              4,182      4,133       15,556   15,110
                                                                                   
    Ore tonnes mined         Kt                702        967        2,752    3,361
                                                                                   
    Mine grade               g/t               2.1        1.9          1.9      2.4
                                                                                   
    Underground:                                                                   
                                                                                   
    Ore tonnes trammed       Kt                127        130          440      298
                                                                                   
    Mine grade               g/t              11.0        8.7         15.6      7.1
                                                                                   
    Processing information:                                                        
                                                                                   
    Ore milled               Kt                693        705        2,830    2,833
                                                                                   
    Head grade               g/t               4.4        3.8          4.5      3.6
                                                                                   
    Mill recovery            %               92.1%      89.5%        92.0%    88.2%

    1 These are non-IFRS measures. Refer to page 7 for definitions

    2 Excludes non-cash capital adjustments (reclamation asset adjustments),
    includes finance lease purchases and land purchases treated as long term
    prepayments

    Gold production for the quarter at North Mara of 91,183 ounces was 18% higher
    than in Q4 2015, as head grade increased by 16% compared to Q4 2015 due to the
    contribution from the high grade Gokona underground mine as well as an increase
    in the open pit mine grade at Nyabirama, combined with a resultant 3% higher
    recovery. Gold ounces sold for the quarter of 92,975 ounces were 2% above
    production due to the sale of gold ounces on hand at the end of September.

    Gold production for the full year of 378,443 ounces was 32% higher than in
    2015, and a record for the mine. This was as a result of 25% higher head grade
    driven by the higher contribution from the Gokona underground mine and a 4%
    improvement in recoveries. Gold ounces sold for the full year of 376,255 ounces
    were 30% higher than the prior year and broadly in line with production.

    Non-IFRS Measures

    Acacia has identified certain measures in this report that are not measures
    defined under IFRS. Non-IFRS financial measures disclosed by management are
    provided as additional information to investors in order to provide them with
    an alternative method for assessing Acacia's financial condition and operating
    results. These measures are not in accordance with, or a substitute for, IFRS,
    and may be different from or inconsistent with non-IFRS financial measures used
    by other companies. These measures are explained further below.

    Net average realised gold price per ounce sold is a non-IFRS financial measure
    which excludes from gold revenue:

    - Unrealised gains and losses on non-hedge derivative contracts; and

    - Export duties

    It also includes realised gains and losses on gold hedge contracts reported as
    part of cost of sales.

    Cash cost per ounce sold is a non-IFRS financial measure. Cash costs include
    all costs absorbed into inventory, as well as royalties, and production taxes,
    and exclude capitalised production stripping costs, inventory purchase
    accounting adjustments, unrealised gains/losses from non-hedge currency and
    commodity contracts, depreciation and amortisation and corporate social
    responsibility charges. Cash cost is calculated net of co-product revenue.

    The presentation of these statistics in this manner allows Acacia to monitor
    and manage those factors that impact production costs on a monthly basis. Cash
    cost per ounce sold is calculated by dividing the aggregate of these costs by
    gold ounces sold. Cash costs and cash cost per ounce sold are calculated on a
    consistent basis for the periods presented.

    All-in sustaining cost (AISC) is a non-IFRS financial measure. The measure is
    in accordance with the World Gold Council's guidance issued in June 2013. It is
    calculated by taking cash cost per ounce sold and adding corporate
    administration costs, reclamation and remediation costs for operating mines,
    corporate social responsibility expenses, mine exploration and study costs,
    capitalised stripping and underground development costs and sustaining capital
    expenditure. This is then divided by the total ounces sold. AISC is intended to
    provide additional information on the total sustaining cost for each ounce
    sold, taking into account expenditure incurred in addition to direct mining
    costs, depreciation and selling costs.

    Net cash is a non-IFRS measure. It is calculated by deducting total borrowings
    from cash and cash equivalents.

    Mining statistical information

    The following describes certain line items used in the Acacia Group's
    discussion of key performance indicators:

      * Open pit material mined - measures in tonnes the total amount of open pit
        ore and waste mined.
      * Underground ore tonnes hoisted / trammed - measures in tonnes the total
        amount of underground ore mined and hoisted / trammed.
      * Total tonnes mined includes open pit material plus underground ore tonnes
        hoisted.
      * Strip ratio - measures the ratio of waste-to-ore for open pit material
        mined.
      * Ore milled - measures in tonnes the amount of ore material processed
        through the mill.
      * Head grade - measures the metal content of mined ore going into a mill for
        processing.
      * Milled recovery - measures the proportion of valuable metal physically
        recovered in the processing of ore. It is generally stated as a percentage
        of the metal recovered compared to the total metal originally present.