Mining water compliance in Africa: the shift from quarterly samples to continuous records
Across four of Africa's mining jurisdictions, the same change is underway and it is easy to miss because no single announcement contains it. Regulators are moving the burden of proof. The old question was did your sample pass? The new one is can you show what the discharge was doing between the samples? Those are different questions, they need different instrumentation, and a compliance file built for the first one cannot answer the second.
By Frank Guo · Technology & Product Leadership, addanode
Four jurisdictions, one direction.
Sampling regimes were designed for a world where measurement was expensive and had to be rationed. Four samples a year, taken by an accredited laboratory, told a regulator whether a site was broadly in control. That logic held for as long as instruments were costly and data had to be carried somewhere to be read. Neither is true now, and regulators have started writing rules that assume it isn't.
What follows is what each jurisdiction actually requires, with the source named, because a good deal of what circulates on this subject is a vendor's summary of a vendor's summary.
A new EIA regime, and groundwater written into it.
Statutory Instrument No. 3 of 2026 — the Environmental Management (Environmental Impact Assessment) Regulations, 2026 — came into force on 9 January 2026, replacing SI No. 28 of 1997 after nearly three decades. It lowers statutory review fees and shortens the approval timelines for environmental and social impact statements and project briefs. For mining, the consequential part is the treatment of projects that depend on or affect groundwater, which now sit inside a modernised assessment framework rather than one written before most operators had a way to measure continuously.
There is a reason the direction of travel in Zambia is toward evidence rather than assurance. In February 2025 a tailings storage facility failure on the Copperbelt released acidic waste into the Kafue River, and consultants engaged to assess it estimated a very large volume of tailings material with arsenic, lead and zinc detected downstream; impacts on farming and fishing livelihoods were still being reported eighteen months later. The regulatory response, not the incident, is what concerns an operator planning a monitoring programme.
The practical consequence for an operator is that groundwater and discharge behaviour now have to be demonstrable across a permit cycle, not sampled at intervals convenient to a laboratory schedule. See ZEMA groundwater compliance in Zambia for what that means on a specific site.
The regulator is buying continuous monitoring for itself.
In May 2026, answering a question in the National Assembly, Deputy Minister Reuben Kwagilwa said the government was in the final stages of installing the Tanzania Online Continuous Emission Monitoring System (TOCEMS), intended to "enable real-time monitoring of pollution levels and prompt action against lawbreakers". In the same exchange it was disclosed that of 158 factories inspected in Dar es Salaam — Temeke in particular — inspectors had found violations including wastewater discharged into residential areas and operations running without the required permits.
TOCEMS is named as an emission system and public reporting has not set out whether its scope reaches effluent, so read it as a signal of where enforcement is heading — continuous and real-time — rather than as a water monitor.
The significance is structural rather than technical. When a regulator installs continuous monitoring on its own side, the asymmetry that made periodic self-reporting workable disappears. An operator whose own record is a quarterly certificate is, from that point on, the party with less information about its own site than the authority inspecting it. Separately, in August 2026 the Mining Commission said it had stepped up nationwide mine inspections covering environmental management plans, rehabilitation of mined-out areas and closure plans.
The oldest rules on this list, and the most specific.
GN 704 of 1999, made under the National Water Act 36 of 1998, still governs how mines handle water, and it is unusual among African regulations in prescribing engineering outcomes rather than aspirations:
- Clean and dirty water systems must be separated — unpolluted water confined to a clean system, kept away from any dirty area.
- Systems must be designed so that clean water is not likely to spill into a dirty system more often than once in fifty years, and all water systems must be designed, built and maintained to carry the flows of a one-in-fifty-year flood.
- A tailings dam forming part of a dirty water system must maintain a minimum freeboard of 0.8 metres above full supply level.
Read those as measurements rather than as design notes and the implication is immediate. A 0.8 metre freeboard is not a property of a structure; it is a state that has to be true continuously, including through the storm that makes it hardest to verify and most consequential to get wrong. A separation requirement between clean and dirty systems is only demonstrable if you know the flow and quality on both sides of the separation. Neither is a quarterly question.
Where a water use licence is required, the Department of Water and Sanitation is required to decide a complete application within 90 calendar days.
Where the monitoring layer fits. Freeboard, pond and return-water levels, flows across the clean and dirty boundary, and quality proxies on both sides are continuous measurements, and they belong on one record with the geotechnical instruments a facility already has — pore pressure, deformation, phreatic surface. Reading them together is what turns a set of separate readings into an account of the facility. Instrumentation design, trigger levels and response actions are set by the engineer of record and aligned to GISTM and the applicable dam-safety regime; the monitoring layer serves that plan rather than substituting for it.
The deadline passed. A third of facilities are still partially conformant.
The Global Industry Standard on Tailings Management set two dates: facilities classified extreme or very high consequence were to conform by 5 August 2023, and all other operational facilities by 5 August 2025. In November 2025 the International Council on Mining and Metals published an aggregate of its members' August 2025 disclosures:
836 facilities
The total tailings storage facilities covered by ICMM member disclosures.
67% / 33%
In full conformance versus partial conformance — after both deadlines had passed.
>80% vs 53–65%
Full conformance among extreme and very-high consequence facilities, against high, significant and low consequence facilities.
ICMM's own assessment is that full alignment is taking longer than anticipated. Two things follow, and the second is the one operators tend to miss.
The first is that the highest-consequence facilities were prioritised, exactly as you would hope. The second is that the gap sits in the high, significant and low consequence facilities — the ones that don't get a dedicated engineering programme, and where conformance therefore depends on whether routine data exists as a matter of course. That is a monitoring and record-keeping problem more than a capital one.
One caution on that 67% figure. It describes ICMM member companies — large international miners who volunteered to disclose. It is not a measure of African mining, and it certainly isn't a measure of mid-tier or junior operators, who are not in the sample at all. Treat it as the best-case end of the distribution, not the middle of it.
Four jurisdictions on one table
| Jurisdiction | Instrument | What it requires of a mine | Record it implies |
|---|---|---|---|
| Zambia | SI 3 of 2026 (EIA) + SI 112 of 2013 (licensing) | Ongoing groundwater monitoring as an approval condition; discharge within Third Schedule limits (COD 90, BOD 50, TSS 100 mg/L) | Water level + abstraction; flow + quality at every discharge |
| Tanzania | Water Quality Standards Regulations 2007; TOCEMS | First Schedule limits (COD 60, BOD 30, TSS 100); regulator moving to online continuous monitoring | Continuous outfall record the regulator will read directly |
| South Africa | GN 704 of 1999 + water-use licence + GN 665 | Clean and dirty water separation, containment, licence-parameter monitoring; general limits COD 75, TSS 25 | Flow at every transfer; quality at every discharge; dam levels |
| Pan-Africa (ICMM members) | GISTM | Performance monitoring and trigger-action response plans on tailings facilities; all deadlines passed | Piezometers, displacement, freeboard, seepage — telemetered |
Different laws, one data layer.
Read the four regimes together and the overlap is not legal, it is instrumental. Whatever the instrument says, it eventually asks for some combination of the same six things:
- Flow, continuously, at the points that matter — abstraction, discharge, return water, and across any clean/dirty boundary. Volume is the variable every regime shares, and it is the one most often estimated.
- Quality proxies between laboratory samples — pH, conductivity, turbidity, temperature. These do not replace accredited analysis and no honest supplier will tell you they do. What they do is tell you whether the sample you submitted was representative of a process in control, and alert you to an excursion in the weeks when nobody is sampling.
- Level — in return water dams, in groundwater monitoring boreholes, in any facility where a freeboard or a licence condition is expressed as a height.
- A time series that survives the site — power cuts, network gaps, a technician leaving. A record with holes in it is a record that will be questioned exactly where it is thinnest.
- Reconciliation — what was abstracted against what was discharged against what was stored. Individual instruments answer individual questions; only reconciliation shows an inspector that the site's account of itself is internally consistent.
- Export in the shape the regulator asks for — the return form, the licence report, the disclosure. Data that cannot be produced in the required format is, for compliance purposes, data you do not have.
None of that is exotic instrumentation. Most of it is measuring things a mine already broadly knows, in a way that is continuous, timestamped, and outside the control of any one person on site.
Frequently asked questions
Can continuous sensors replace accredited laboratory sampling?
No, and any supplier suggesting otherwise is creating a compliance risk for you. Parameters like BOD, COD, metals and most regulated determinands are laboratory measurements, and regulators specify accredited laboratories for good reason. Continuous instruments measure proxies — flow, level, pH, conductivity, turbidity, temperature. Their value is in the interval between samples: showing that the sampled condition was typical, catching excursions when nobody is watching, and producing the volumetric record that sampling never generates.
What is Zambia's SI 3 of 2026?
The Environmental Management (Environmental Impact Assessment) Regulations, 2026, in force from 9 January 2026, replacing SI No. 28 of 1997. It reduces statutory review fees and shortens approval timelines for environmental and social impact statements and project briefs, and modernises how projects that depend on or affect groundwater are assessed. It is an assessment regime rather than a discharge-limits instrument, so it shapes what a project must demonstrate to be approved and to stay approved.
What does GN 704 require of a South African mine?
Made under the National Water Act 36 of 1998, GN 704 requires clean and dirty water systems to be separated, with unpolluted water kept in a clean system away from dirty areas; requires systems to be designed so clean water is unlikely to spill into a dirty system more than once in fifty years and to handle a one-in-fifty-year flood; and requires a tailings dam forming part of a dirty water system to keep a minimum freeboard of 0.8 metres above full supply level. It is prescriptive in a way most regional regulations are not — which also makes it unusually easy to evidence, if you are measuring.
Is GISTM law?
Not in itself. GISTM is a voluntary industry standard, adopted by ICMM members as a condition of membership and increasingly written into lender, insurer and offtake requirements — which is how a voluntary standard acquires teeth. Its conformance deadlines were 5 August 2023 for extreme and very high consequence facilities and 5 August 2025 for all other operational facilities. National law still applies independently and is what a regulator enforces.
Why do smaller tailings facilities lag on conformance?
ICMM's aggregated 2025 disclosures show full conformance above 80% for extreme and very high consequence facilities but 53–65% for high, significant and low consequence ones. The high-consequence facilities get dedicated engineering attention and budget; the rest depend on whether adequate routine data already exists. Where it doesn't, conformance turns into a retrospective data-gathering exercise, which is slow and expensive precisely because it is retrospective.
What does continuous monitoring cover on a tailings facility?
On the water side: freeboard and pond level, return-water dam levels, flows across the clean and dirty boundary, discharge and abstraction volumes, and quality proxies such as pH, conductivity and turbidity. Where a facility carries geotechnical instrumentation — piezometers for pore pressure, inclinometers and survey points for movement, phreatic surface — those readings can run onto the same platform and alert against the same trigger levels, so the water and geotechnical pictures are read together rather than in separate reports. The instrumentation plan, trigger levels and response actions are set by the engineer of record.
Where should a site with no continuous monitoring start?
With flow at the licensed points, because volume is what every one of these regimes asks about and it is the thing most often estimated. Add quality proxies at the discharge next, then levels. Sites that begin with a large sensor array usually end up with a large sensor array nobody reads; sites that begin with two well-chosen points and a record that never breaks tend to keep extending it.
Primary sources
- ICMM — Tailings Progress Report, implementing the GISTM (2025)
- Global Industry Standard on Tailings Management (GISTM)
- GN 704 of 1999 — Regulations on use of water for mining, South Africa (PDF)
- Environmental Management Act (Chapter 20:27), Zimbabwe (PDF)
- National Environment Management Council, Tanzania
Your licence names the points. We make them produce a record.
Tell an engineer what your licence or permit conditions require and what you measure today. You'll get an honest view of the gap and what closing it involves.