Sustainability Report <SR> 2020

Water

“In 2020, our overall water use intensity shows an increase. This metric reflects water withdrawn from the environment to offset productionrelated consumption losses.”

PRIORITIZED SDGs

In 2019, to align our water reporting with the ICMM Consistent Water Reporting guide, we undertook an analysis of our operating sites’ water context using the WWF (World Wildlife Fund) Water Risk filter. This has been updated during 2020, and we have elevated the profile of water scarcity in our overall reporting on water.

In Tanzania, proof of concept trials for in-situ groundwater remediation were undertaken downstream of Geita mine’s TSF. These proved to be successful and we are planning for full implementation of this in-situ sulphate remediation methodology.

During 2020, the AngloGold Ashanti operations in Brazil completed updates to their water accounting systems. In addition, water balance scenarios were run to simulate the effects of decommissioning existing TSFs, in response to new legal requirements, and transitioning to TSF filtering and dry stacking technology. This work is essential in informing the future water use needs at each mine site.

In 2020, our overall water use intensity shows an increase. This metric reflects water withdrawn from the environment to offset productionrelated consumption losses. To a small degree, this change is ascribed to COVID-19-related throughput disruptions, but it also signals an ongoing change in AngloGold Ashanti’s asset mix, with South African operations only included up to September 2020 and the effects of production ramp-up at Obuasi mine.

Our interactions with water

Our performance


Indicator 2020 2019 2018 2017 2016
Water use (Megalitres)
Group 47,40547,89645,89252,21950,716
Argentina1,3921,5121,5961,4871,152
Cerro Vanguardia1,3921,5121,5961,4871,152
Australia8,7288,6987,7346,7837,577
Sunrise Dam1,6571,8981,8081,1151,779
Tropicana7,0716,8015,9265,6685,798
Brazil9,1847,2686,2176,7996,915
AGA Mineração8,0636,8254,7175,2955,292
Serra Grande1,1214431,5001,5041,623
Ghana2,133801,6362,137936
Iduapriem454801,6362,137936
Obuasi1,678
Guinea7,4087,0836,0276,3493,395
Siguiri7,4087,0836,0276,3493,395
Mali4,6575,4094,2013,4763,944
Sadiola4,6575,4094,2013,4763,940
Yatela4
South Africa10,73814,61714,77020,50323,161
Mine Waste Solutions6,4697,7797,0076,0026,475
Vaal River1,5443,5814,50710,81312,275
West Wits2,7253,2573,2563,6884,411
Tanzania3,1653,2293,7114,6893,637
Geita3,1653,2293,7114,6893,637
Water use efficiency (Kilolitres per tonne)
Group 0.680.590.570.610.59
Argentina0.610.520.550.450.37
Cerro Vanguardia0.610.520.550.450.37
Australia0.680.680.650.580.69
Sunrise Dam0.410.460.450.280.44
Tropicana0.800.790.760.740.84
Brazil1.731.601.501.541.69
AGA Mineração2.122.111.591.761.90
Serra Grande0.740.341.291.061.23
Ghana0.380.020.310.420.18
Iduapriem0.090.020.310.420.18
Obuasi2.740.000.000.000.00
Guinea0.660.680.580.540.28
Siguiri0.660.680.580.540.28
Mali1.251.130.810.690.77
Sadiola1.251.130.810.690.80
Yatela0.000.000.02
South Africa0.460.420.420.530.59
Mine Waste Solutions0.360.290.270.230.25
Vaal River0.670.941.101.361.37
West Wits0.790.690.690.801.00
Tanzania0.580.620.690.880.66
Geita0.580.620.690.880.66
Water use by source
Location Ground water use related to production
kL
Utility and/or other external water suppliers related to production
kL
Total Water Use related to production
kL
Vaal River (Input)650,906291,4061,544,289
West Wits (Input)899,1901,826,2472,725,437
Mine Waste Solutions732,7475,735,8936,468,640
Sadiola4,657,092
Obuasi1,678,2021,678,202
Iduapriem88,041454,483
Siguiri7,408,464
Geita3,164,501
Sunrise Dam1,607,16449,5641,656,728
Tropicana7,071,3997,071,399
AGA Brazil (Mineração)3,009,5698,062,743
Serra Grande1,120,9301,120,930
Cerro Vanguardia1,391,9641,391,964
Total AGA18,250,1127,903,11047,404,872
Water reuse
LocationPercentage of water re-used as per the MCA Water Accounting FrameworkTotal volume of water recycled and reused by the organisation kLTotal water use related to production kL
Sadiola6612,088,97518,183,733
Obuasi544,240,0877,888,705
Iduapriem8211,270,37813,821,401
Siguiri7231,809,86043,882,520
Geita8015,163,92719,043,318
Sunrise Dam613,261,1915,341,444
Tropicana538,265,94515,740,221
AGA Brazil (Mineração)4810,744,41822,338,585
Serra Grande654,255,6466,542,408
Cerro Vanguardia806,651,3028,362,201
Vaal River (Input)625,137,7898,308,445
Mine Waste Solutions8759,494,10568,506,404
West Wits (Input)7818,378,03123,548,078
Total AGA73190,761,654261,507,463
2020 Interactions with water
MetricDescriptionVolume of water by Quality
High (ML)Low (ML)Total (ML)
Imports for useSurface water21,252021,252
  Groundwater4,21914,03218,250
  Third party water7,903 0 7,903
  Total water imports33,37314,03247,405
Harvested Rainfall Direct rainfall20,45420,454
  Indirect runoff 2,887 2,887
  Total rainfall23,34123,341
Discharge from process system To surface water3,2922,7246,016
  To groundwater000
  To third parties 0 0 0
  Total discharge3,2922,7246,016
Consumption  Evaporation, entrainment or other5189212,83864,730
EfficiencyWater reuse (%)    73%
DiversionsThrough and from operations13,89513,895
  • Ref: 2017 ICMM consistant water reporting guide.
  • High Quality: Less or equal to 1000 ppm of total dissolved solids.
  • Low Quality: Greater than 1000 ppm of total dissolved solids.
Water diversions
LocationDescription
IduapriemA volume of 3,641,332 kL of directly captured rainfall and surface runoff was diverted from the Block 7 & 8 pit to the Agonabeng stream, having an average pH of 6.93 and a conductivity of  0.41 mS/cm. No treatment was required.
IduapriemA volume of 571,790 kL of directly captured rainfall and surface runoff was diverted from the Block 3 pit to the Agonabeng stream, having an average pH of 8.31 and a conductivity of  0.40 mS/cm. No treatment was required.
Serra GrandeAn estimated 963,706 kL of groundwater was dewatered from the Mina Nova mine having an annual average pH of 7.89 and a conductivity of 1.14 mS/cm, and was diverted to the Vermelho River following suspended solids precipitation with flocculant. 
Serra GrandeAn estimated 439,265 kL of groundwater was dewatered from the Palmeiras Mine having an annual average pH of 7.66 and a conductivity of 0.72 mS/cm, and was diverted to the Gerais stream following suspended solids precipitation with flocculant. 
Serra GrandeAn estimated 51,037 kL of groundwater was dewatered from the Palmeiras Mine having an annual average pH of 7.50 and a conductivity of 0.58 mS/cm, and was diverted to the Almas stream following primary biological treatment and chlorination.
AGA Mineração201,342 kL of groundwater was dewatered from Cuiabá Mine, having an annual average pH of 7.30 and a conductivity of 0.30 mS/cm, and was diverted to the Sabará River following pH adjustment with sodium hydroxide. 
AGA Mineração499,336 kL of groundwater was dewatered from Lamego Mine water with an annual average pH of 8.00 and a conductivity of 0.86 mS/cm, and was diverted to the Papa Farinha and Pataca Creek (Conceição River) following removal of suspended solids through flocculation.
AGA Mineração658,134 kL of groundwater was dewatered from the Córrego do Sítio Mine water with an annual average pH of 7.7 and a conductivity of 0.91 mS/cm, and was diverted to the Conceição River following correction of arsenic concentration with ferrous sulphate and the removal of suspended solids through flocculation.
ObuasiA volume of 689,127 kL of treated runoff water from the Pompora and Kokoteasua TSFs was diverted via the Pompora Reverse Osmosis Plant to the Kwabrafo River having an annual average pH of 6.80 and a conductivity of 0.46 mS/cm.
West WitsA volume of 367,159 kL of purified sewage effluent was released from the Aquatic Dam to the Elandsfonteinspruit, with an average pH of 7.73 and an average conductivity of 1.5 mS/cm
Sunrise DamA volume of 698,610 kL of groundwater from the underground mine and pit dewatering having an annual average pH of 6.6 and a conductivity of 215.57 mS/cm, was diverted to Lake Carey, a salt lake. 
SiguiriA volume of 753,983 kL of excess water from Tubani pit was diverted to the environment having an annual average pH of 6.28 and a conductivity of 0.48 mS/cm.
SiguiriA volume of 662,648 kL of excess water from Kami pit was diverted to the environment having an annual average pH of 6.76 and a conductivity of 0.60 mS/cm.
SiguiriA volume of 173,704 kL of excess water from Silakoro pit was diverted to the environment having an annual average pH of 7.39 and a conductivity of 0.34 mS/cm.
Water Discharges
LocationDescription
AGA Mineração5,946,906 kL of Queiroz Plant effluent water with an annual average pH of 6.5 and a conductivity of 2.06 mS/cm, was discharged was discharged via the Cocoruto dam to the Velhas River following arsenic precipitation with ferric sulphate.
AGA Mineração301,201 kL of excess water from Córrego do Sítio process plant, with an annual average pH of 7.78 and a conductivity of 4.43 mS/cm, was discharged to the Conceição River following arsenic precipitation with ferric sulphate and pH adjustment with lime. 
Serra GrandeAn estimated 880,788 kL of excess water from the Serra Grande process plant, with an annual average pH of 7.29 and a conductivity of 1.80 mS/cm, was discharged to a tributary of the Red River following arsenic precipitation and cyanide destruction. 
ObuasiA volume of 789,112 kL of excess water from the South Treatment Plant's OTP Pond was treated and discharged from the South Reverse Osmosis Plant to the Nyam River having an annual average pH of 7.20 and a conductivity of 0.58 mS/cm.
ObuasiA volume of 1,621,818 kL of water from Pond 3 was treated and discharged from the South Reverse Osmosis Plant to the Nyam River having an annual average pH of 7.30 and a conductivity of 0.59 mS/cm
Indicator 2020 2019 2018 2017 2016
NOx,Sox (tonnes)
Oxides of Nitrogen511848624,6244,0734,496
Oxides of Sulphur134143117170629
Reportable environmental incidents83231
Indictor2020
Value of significant environmental fines paidAngloGold Ashanti defines a significant fine as one that exceeds USD100,000. No such fines were paid in 2020.  Note that a fine received following the significant environmental incident at Cuiaba mine, exceeds this threshold, however it is currently under appeal.
Number of significant non-monetary sanctions receivedOne non-monetary sanction following environmental violations was received by Geita gold mine.
Water sources significantly affected by withdrawal of water in 2020The 401,000 ha Niger-Tinkisso Ramsar site is an extensive area of river and freshwater ponds and marshes between and around the Tinkisso and Niger Rivers, however its boundaries are not clearly defined. As many as 101,000 ha of the Ramsar site may overlap the (159,000 ha) Siguiri mine concession in Guinea. The mine abstracts less than 0.5% of the Tinkisso River's annual flow.

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