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Managing Water Risks and working with local communities in water scarce areas 24 March 2019Jerry Zozo and Hilaire Diarra
Presented by Graham Trusler
Overview of Water UseContext – Barrick Mines
- Abstraction of water mostly required for gold processing in the
milling section
- Additional water required for reagent mixing at the CIL and
floatation sections
- Natural water inputs include: rainfall, seepage into the mine,
existing streams within mining areas, etc.
- Positive water balance and controlled effluent discharge into the
environment or towards the communities
- Compliance for potential affected community - Monitoring.
- Contamination from mining run-off towards the environment
Flood prevention – and water access protection
Aerial photo – KGM Gold Mine, DRC
Surface water catchment – control point, KGM
Flood prevention – and water access protection
Downstream SU9 – with and without flooding scenariosSurface water management plan, KGM
Flood prevention – and water access protection
- Relocation of some local communities exposed to flooding events from mining or
associated operations was required – e.g. Ambarau Hydropowerplant
- Provision for catchment dams as interval retain dam for flooding event
- Community Control and effective drainage of mining discharge away from community
boreholes and households locations
- Regular monitoring of free board of all operational tailings dams
Flood prevention – Tailings dam return
water process - Tailings dam returning water through submersible pumps from the dam pool
- The TSFs for CN containing tailings are plastic lined to restrict groundwater
infiltration
- Penstock system operated with manual rings to regulate flow at the FTSF
- Automatic pumping capacity established at the designed sump – with level
transmitter sensors in the sumps, booster pumps to allow high pumping capacity,
high quantity of retention capacity of the sumps, permanent operators at the station,
etc.)
- Return water dam controlled discharge – only in the event of successive storms and
very close monitoring of water quality preceeds any approved discharge scenario
- Provisional storage (for instance Detox ponds) for process purposes are maintained
within the Metallurgical plant to allow flexibility before any controlled discharge from
the return water dam
Monitoring of water use – and water balance model
FTSF
CTSF - 2 CTSF - 1
Kibali River
Expanded CTSF (future use)
WRDWRDRaw
Water Dam
Process PlantWRD
Catchment Dam
RWD
Pakaka OP
Dust Sup
PCD
KCD OPKombokolo OP
KCD UG
Process Water Dam
WRD
KMS Dam
Mining Offices
CampWTP 1
WTP 3
Plant Offices
STP 1
STP 2
UG STP 3 Paste Plant
Paste Water Dam
Clarifier
SGS
WTP 2
Detox pond
WRD
Gorumbwa
Old
Monitoring of water use – Quarterly inflow/outflow inventory
# Q3-2017 WATER BALANCE INDICATORS
Monthly ABSTRACTION (m3)
Monthly DISCHARGE (m3)
Q3-2017 WATER BALANCE INDICATORS
1 Groundwater to plant against Discharge - FTSF controlled)
130492.04 0 Discharge - FTSF (Controlled)
2 Dams 55911 55911
3 River/Dam water flow to Plant against Kibali Discharge - pits+UG)
357507.8 1105187.6
Discharge - pits+UG
4
Total Borehole water abstracted against Wastewater or sewage effluent)
39846 13176.7574 Wastewater Treatment (Sewage effluent)
5 Total water abstracted against Total mining Dewatering
583 756.9 1 308 078.2 Total Dewatering (mining)
MINE WATER BALANCE TREND Positive
44.6 % of water discharged is exceeding the total
abstraction in Q3 -2017
Monitoring of water use – weekly water balance within the process plant and return efficiency
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Rec
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Water recycled in the process plant -2018
Plant Water useEfficiency 2018
Randgold Targets
Current YTDaverage
Same YTD in 2017
3% improved efficiency of plant return water from 71.5% in 2017 to 74.7% in 2018
Detailed water interaction from the process plant –weekly manifest from daily readings of flowmeters –Week 11 in 2019
- Regular engagement with community leaders regarding sustainable development of their
villages
- 165 local artisans from the surrounding villages received training on waste management
and pollution prevention
- Monthly meetings or forums with community delegates to assess the issues and needs
for urgent actions of development within the KGM community hall
- Partnership within community in agribusiness skills and also 132 community members
were trained for mechanic, carpenter, tailor and welding courses.
Training of local village committees
Trainings of local villages committees
- Level of education within the community is being leveraged by a strong empowerment
program for youth and children
- 20 high school scholarships for study in the capital city are awarded to best students on
an annual basis
- One master degree scholarship will be given to a local student for research on Rhino re-
introduction in the neighboring Garamba national Park
- Around some 67 primary and secondary schools were built in the surrounding villages
during the relocation period.
- 2 libraries and a university were renovated and supported financially
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