Understand Tailings Environmental Risk Assessment and ALARP Demonstration

Tailings Risk Escalation

Tailings dams hold vast quantities of mining waste—slurry from ore processing that can be toxic and unstable. Failures release this material in devastating flows, as seen in the Brumadinho disaster of 2019, which killed 270 people. Global standards emerged to prevent repeats, but incidents persist.

In early 2026, a failure at Morowali Industrial Park in Indonesia buried equipment and an operator, part of a string of events including Zambia's Mukabamo mine in November 2025 and Tanzania's Williamson diamond mine in 2022. These affect miners, nearby residents, and ecosystems, with slurry covering farmland and polluting water sources. In Tanzania, 5.4 square kilometers were inundated, disrupting agriculture and requiring 326,000 euros in fines.

The push intensified after the Global Industry Standard on Tailings Management launched in 2020. By August 2025, mining giants had to disclose conformance; a November report showed 67% compliance, but delays persist. The Global Tailings Management Institute, formed in January 2025, now oversees audits, pressuring laggards.

ALARP—As Low As Reasonably Practicable—guides decisions, weighing risk reduction against costs. In practice, this means retrofitting dams or adopting dry stacking, which reduces water-related failures but increases upfront expenses. Climate models predict more extreme rain, raising overtopping odds; 25% of historical failures tied to this.

Australia, a mining powerhouse, aligns with these via state laws and ANCOLD guidelines. From September 2025, new proposals must detail full lifecycle management, including closure. This could add millions to projects but averts liabilities like BHP's ongoing Samarco case, ruled negligent in November 2025.

Tensions arise: companies resist high costs for 'low-probability' events, while communities demand zero risk. Non-obvious: psychological safety in workplaces affects reporting; poor cultures hide issues. Also, inactive dams—long-term care sites—now fall under protocols, exposing legacy risks.

Stakes are concrete: non-compliance risks operations halt, as in Philippines' Siana in 2024. Cleanup from Indonesia's March 2025 landslide could take six months, costing tens of millions. Inaction invites lawsuits, reputational damage, and lost investment.