Why South Africa’s Tailings Dam Rules Must Become Mandatory

South Africa has more than a century of tailings dam engineering experience. It has world-class geotechnical expertise, a deep bench of qualified professionals, and a failure record that stretches back decades. Yet on 13 August 2026, the northern wall of the Dikwena Chrome tailings storage facility collapsed, releasing most of its stored tailings and damaging mine infrastructure, a railway line, and Eskom power lines.

The contradiction matters. These are not knowledge failures. Professor Jacobs of the University of Pretoria has stated explicitly that tailings dam failures are not unforeseeable events and should not be treated as acts of nature. The engineering solutions exist. The standards frameworks exist. What does not exist, consistently, is the governance and regulatory architecture that forces operators to apply them.

This analysis gives you a framework for assessing which South African mining exposures carry structural tailings risk, which companies are managing it seriously, and what the regulatory trajectory ahead means for your portfolio positioning.

Three failures across three decades, and what the pattern tells you

In 1994, the Harmony Gold No. 4 dam at Merriespruit failed through overtopping and liquefaction. The resulting flow destroyed large parts of a residential suburb and killed 17 people. South Africa had the engineering knowledge to prevent it. The failure happened anyway.

Nearly three decades later, in 2022, a fine tailings storage facility at the Jagersfontein diamond mine collapsed. More than 6 million cubic metres of sludge swept through downstream communities, destroying approximately 200 houses and 1,600 hectares of agricultural land. At least two people were killed, with one person still missing. Investigators described the disaster as the culmination of 150 years of poor decisions and governance weaknesses. Criminal proceedings are now under way.

Then, on 13 August 2026, the Dikwena Chrome tailings storage facility near Brits suffered a compartment failure that collapsed the northern wall, released most stored tailings, damaged infrastructure, and polluted a tributary. No fatalities were reported, but the Department of Mineral and Petroleum Resources has issued formal investigation instructions, and the inquiry remains ongoing as of 27 August 2026.

Professor Jacobs of the University of Pretoria has stated that tailings dam failures are not unforeseeable events and should not be treated as acts of nature. They result from failures of process and oversight.

Three failures spanning 32 years in a jurisdiction with deep technical expertise do not describe bad luck. They describe a governance and enforcement deficit that has persisted through three distinct eras of mining regulation. A single failure can be dismissed as company-specific. This pattern cannot.

Why voluntary standards are not closing the safety gap

The Global Industry Standard on Tailings Management (GISTM) is the leading international framework for tailings safety. It was developed jointly by the International Council on Mining and Metals (ICMM), the United Nations Environment Programme (UNEP), and the Principles for Responsible Investment (PRI), and was published in 2020 in direct response to the catastrophic failures at Mariana (2015) and Brumadinho (2019) in Brazil.

In South Africa, GISTM adherence remains voluntary as of August 2026. The adoption pattern is uneven. International majors and companies under strong ESG scrutiny are more likely to align with the standard. Smaller, unlisted, or legacy-focused operators are less consistently aligned, particularly at lower-profile facilities where external investor visibility is limited.

That gap between group-level policy statements and facility-level compliance is where undisclosed risk accumulates. Civil society analyses of the Jagersfontein disaster explicitly link the failure to inadequate oversight and call for binding guidelines and enforcement rather than reliance on voluntary compliance.

The engineering solutions to tailings dam failures are well-documented, yet the gap between available technical tools and their consistent application in the field reflects a governance deficit that South Africa’s voluntary compliance model has not resolved.

Professor Jacobs has indicated that bringing GISTM requirements into mandatory regulation may be an essential next step. Within the South African geotechnical engineering community, active discussions are under way about convening a structured forum that would bring legislators, dam owners, operators, and specialist consultants together to examine why failures continue to occur.

The engineer-of-record gap and why outsourcing makes it worse

Each tailings storage facility requires a named engineer of record, a senior geotechnical professional with meaningful tailings-specific experience who holds continuous technical responsibility across operational and construction activities. The role requires:

• Designation of a qualified geotechnical engineer with substantial tailings-specific experience
• Independence from the contractors managing day-to-day dam construction and operations
• A direct reporting line to the board or risk committee, not filtered through operational management

The increasing outsourcing of dam management to specialist contractors makes this independence a governance question rather than merely a technical one. When the engineer of record is employed by the same contracting entity managing the dam, the mandate to challenge operational decisions or flag rising risk is compromised. Cost pressures compound the problem: when regulatory requirements are not strictly enforced, engineering and safety compromises become commercially rational even if they are technically reckless.

For investors, the distinction between a company that has a GISTM policy and a company that has an independent engineer of record with board-level reporting authority at every facility is the distinction between compliance optics and actual risk management.

How retreatment operations are adding a layer of technical risk

Across South Africa’s mining sector, the reprocessing of historic tailings deposits has become an increasingly significant activity. Around Johannesburg, operators are using hydraulic mining techniques to work through old gold tailings accumulated over more than a century, recovering residual gold that earlier processing left behind. In the platinum group metals (PGM) and chrome sectors, companies are returning to existing tailings to recover chromite that was uneconomic to extract when those deposits were first created. To receive material reclaimed from these legacy sites, a substantial new facility is reportedly being developed southwest of Johannesburg.

The retreatment narrative is often framed as value recovery and ESG-positive circular mining. That framing is incomplete.

The tailings reprocessing economics that make retreatment operations commercially attractive do not eliminate the technical liabilities that accompany them; the value recovery framing that operators and ESG narratives often apply to these projects tends to underweight the structural risks introduced when legacy infrastructure is pressed into service for technically demanding new conditions.

Legacy facilities were generally not constructed to modern standards. They typically lacked liner systems, had no formal environmental controls, and were built under older construction norms. New receiving facilities are generally lined, built at flatter gradients to facilitate eventual rehabilitation, and overseen by qualified engineering teams. Retreatment operations bridge these two environments, creating a dual-risk structure where old infrastructure feeds technically demanding new conditions.

The liquefaction risk hiding in the reprocessing economics

When tailings are reground to smaller particle sizes during reprocessing, the resulting slurry becomes considerably more challenging to handle without compromising structural integrity. Finer particles hold moisture more tenaciously, which lowers shear strength and demands tighter control over rise rate management. Geotechnical research supports the conclusion that tailings with a fine grain size and high water content carry elevated liquefaction risk, particularly where drainage systems are insufficient to cope.

The particle grind across certain PGM operations is reportedly trending finer on a sustained basis. This represents a risk that is moving in one direction, with stable management requiring progressively greater technical rigour over time rather than remaining constant.

Jagersfontein illustrates the compounding effect. A legacy facility associated with evolving reprocessing decisions accumulated risk precisely because governance and oversight weakened as the technical demands grew. Investors in companies operating at the intersection of legacy infrastructure and increasingly fine-particle retreatment face a risk profile that is growing in complexity, not shrinking.

Communities in the blast radius, and what that means for liability

Across the Witwatersrand, tailings facilities sit alongside and between established residential suburbs and townships, a consequence of more than 100 years of incremental tailings deposition as mining expanded into areas that communities subsequently built around. For many people living in proximity to these sites, relocation is not a practical option.

The documented human consequences are severe. Merriespruit killed 17 people in a residential suburb. Jagersfontein destroyed approximately 200 houses and 1,600 hectares of agricultural land. Professor Jacobs has noted that facilities built and managed to a genuinely high engineering standard by competent practitioners can operate at an acceptable level of risk for surrounding communities. Where management falls short or engineering is inadequate, the risk to nearby populations becomes unacceptable.

Investigators described the Jagersfontein disaster as the culmination of a 150-year sociohistorical pattern of poor decisions and governance weaknesses, rather than an unforeseeable act of nature.

The liability trajectory is hardening. The criminal proceedings at Jagersfontein represent official recognition that these failures are preventable and therefore potentially prosecutable. The formal Department of Mineral and Petroleum Resources investigation at Dikwena Chrome reinforces the regulatory posture. ESG and investor advocacy groups are now explicitly flagging South African tailings failures as evidence for stronger regulation and human rights due diligence.

For investors, the tail risk now extends across three distinct liability vectors:

• Criminal prosecution: Jagersfontein has established the precedent that operators and responsible parties may face criminal charges for foreseeable failures
• Civil claims: Property destruction, agricultural loss, and personal harm create direct civil liability exposure
• ESG-driven asset exclusion: Investor-facing frameworks are framing these events as indicators of material regulatory and ESG risk, which can trigger portfolio-level exclusion decisions

The combination of dense residential proximity, an evolving prosecutorial posture, and growing ESG scrutiny means that inadequate tailings governance is no longer primarily a remediation cost problem. It is a multi-dimensional liability exposure.

Environmental and closure risks in South African mining extend well beyond active tailings failures; the long-tail liability associated with historically deposited tailings, including acid mine drainage, groundwater contamination, and community health claims, can remain material for decades after a facility closes and often surface in due diligence processes for acquisitions involving legacy assets.

A due diligence framework for assessing tailings risk in South African mining exposures

The analytical argument is clear: the risk is structural, the regulatory gap is real, and the liability trajectory is hardening. What follows converts that analysis into a practical engagement framework. These five dimensions represent the minimum threshold for informed assessment of tailings risk in any South African mining exposure:

1. Historical failure disclosure: Request disclosure of all historical tailings incidents and near-misses, including at legacy assets acquired through mergers and acquisitions. Acquired facilities may carry undisclosed failure histories that are material to your risk assessment. Ask how lessons learned from past incidents have changed current practice.
2. Facility-level GISTM alignment: Request facility-level evidence of GISTM or equivalent compliance, not group-level policy statements. This includes independent audit reports and timelines for addressing remaining gaps. Group-level commitments are insufficient to assess risk at individual facilities, particularly smaller or legacy operations.
3. Engineer-of-record transparency: Require disclosure of the named engineer-of-record entity for each tailings storage facility, their independence from construction contractors, and the nature of their mandate and reporting line to the board or risk committee.
4. Community engagement and emergency preparedness: Request evidence of community-informed emergency response plans, functioning early warning systems, and periodic drills documented with local authorities and residents. Jagersfontein demonstrated the consequences of inadequate preparedness in residential proximity contexts.
5. Regulatory engagement evidence: Assess whether the company is actively participating in national or industry-level initiatives responding to recent failures. Constructive engagement, rather than a defensive posture, signals seriousness about systemic risk management over minimum compliance.

Investors who rely on group-level GISTM commitments without facility-level audit evidence are accepting undisclosed risk. These five questions give you the tools to distinguish companies managing the risk from those presenting compliance optics while carrying real exposure underneath.

A comprehensive mining due diligence framework addresses tailings risk as one component of a broader technical assessment that also covers resource classification, permitting status, and infrastructure adequacy; investors who isolate tailings governance from this wider picture may miss correlated risks that compound their exposure across multiple dimensions simultaneously.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions.

Mandatory standards or more Dikwenas: where South Africa’s regulatory trajectory points

The engineering knowledge exists. The standards framework exists. The failure record proves that voluntary adoption without enforcement is not delivering acceptable outcomes.

The signals are converging. Professor Jacobs has indicated that making GISTM requirements mandatory may be an unavoidable next step, and that the South African geotechnical engineering community is actively considering whether to convene a dedicated forum that would seat legislators, operators, dam owners, and consultants together to work through why these failures persist. The criminal proceedings at Jagersfontein have established a prosecutorial precedent. The Department of Mineral and Petroleum Resources is formally investigating Dikwena Chrome as of August 2026. ESG investor pressure continues to build.

Together, these developments constitute a directional signal toward mandatory standards, even if the timeline remains uncertain. Companies already aligned with GISTM at the facility level and transparent on engineer-of-record governance will face lower transition costs and regulatory risk when that mandatory adoption arrives.

The question for your portfolio is not whether South African tailings regulation will tighten. It is whether the companies in your portfolio are positioned for that transition, or exposed by it.

The investors who understand this directional trajectory now can distinguish between operators managing the transition and those still relying on the voluntary compliance window that each successive failure narrows further.