//: # (meta: Learn what the Global Industry Standard on Tailings Management (GISTM) is, why it was created, its key principles, and how mining companies are implementing it to prevent future tailings disasters.)

Understanding the Global Industry Standard on Tailings Management (GISTM): A Complete Overview

Introduction  from tragedy to transformation

The Global Industry Standard on Tailings Management (GISTM) represents one of the most significant safety and governance reforms in the history of mining. Developed after the Brumadinho tailings dam disaster in Brazil (2019), which claimed 270 lives and caused immense environmental damage, the GISTM sets out to ensure that zero harm to people and the environment becomes the universal goal for every tailings facility on Earth.

Launched in August 2020 by the United Nations Environment Programme (UNEP), the Principles for Responsible Investment (PRI), and the International Council on Mining and Metals (ICMM), the GISTM defines 15 principles and 77 requirements that apply to the entire lifecycle of a tailings facility  from site selection and design to closure and post-closure monitoring.

This post explains the origins, structure, and goals of the GISTM, and offers insights into how it’s reshaping mining operations around the world, especially in regions like South America where tailings risk is acute.

Why GISTM was created  lessons from failures

Before GISTM, tailings governance was fragmented. Each country had its own rules, and compliance varied widely. Despite decades of technical progress, catastrophic failures continued  notably:

Mount Polley (Canada, 2014): design and water balance issues led to massive environmental release.

Samarco (Brazil, 2015): structural failure released 40 million cubic meters of tailings, causing 19 deaths and devastating river ecosystems.

Brumadinho (Brazil, 2019): dam collapse at a deWhat makes GISTM different from past standards

Older tailings standards focused almost entirely on technical design and stability. GISTM shifts the paradigm by embedding social and governance accountability into every stage.

Key differences include:

Board-level accountability. A senior corporate officer  the Accountable Executive  must ensure implementation and report to the board.

Independent oversight. Facilities must be reviewed by an independent Engineer of Record (EoR) and, for high-consequence sites, an Independent Review Board (IRB).

Transparency requirements. Regular public disclosure of each facility’s status, risk level, and corrective actions.

Lifecycle coverage. The standard applies from site selection to post-closure, not just during operation.

Community inclusion. Operators must engage communities in emergency preparedness and disclosure.

This combination of technical rigor and social governance makes GISTM a holistic framework  more aligned with ESG principles and modern investor expectations.

Who must comply  and by when

All ICMM member companies committed to bringing their tailings facilities into conformance by:

August 2023 for “extreme- and very high-consequence” facilities;

August 2025 for all other facilities.

Other major operators and financial institutions are voluntarily adopting GISTM as a due diligence benchmark  meaning that even non-ICMM mines are being indirectly pressured to comply to maintain investor access, obtain insurance, or secure project finance.

To support conformance and assurance, the Global Tailings Management Institute (GTMI) was established to provide independent certification and oversight.

Implementation in practice  examples from South America

Latin America, particularly Brazil, Chile, and Peru, has been central to GISTM’s rollout:

Brazil: Following Brumadinho, major operators like Vale, Anglo American, and Kinross prioritized Brazilian TSFs for GISTM compliance. Many facilities are now independently certified.

Chile: Operators such as BHP, Teck, and Antofagasta report high alignment, integrating seismic-resistant design codes and filtered tailings systems.

Peru: Companies like Gold Fields and Antamina publish facility-level disclosure reports, demonstrating compliance and engaging with local communities at high-altitude sites.

Across these regions, GISTM is shaping new norms in transparency, risk communication, and consequence-based design  far beyond traditional engineering compliance.

Challenges to GISTM adoption

Implementing GISTM is complex. Key challenges include:

Legacy facilities. Many older dams were built under outdated standards, making retrofitting costly and technically challenging.

Data gaps. Incomplete geotechnical or hydrological records complicate risk classification.

Cost and capacity. Smaller operators and developing countries face resource constraints for full compliance.

Assurance fatigue. Multiple overlapping audits (GISTM, ISO, ESG) strain teams.

Cultural shift. Embedding accountability and transparency requires organizational change, not just technical fixes.

Despite these barriers, industry momentum  driven by investors, insurers, and public pressure  continues to accelerate adoption.

The bigger picture  GISTM as an ESG benchmark

GISTM’s significance extends beyond tailings management. It represents a model for future ESG standards in mining: outcome-based, globally harmonized, and independently auditable.

For investors and communities, it provides assurance that environmental and social risks are being systematically managed. For mining companies, it offers a credible framework to demonstrate responsibility and resilience in a world demanding higher transparency.

Key takeaways for operators

If you’re involved in tailings management, here’s what GISTM means for you:

Start with a portfolio-level consequence classification  know which facilities must comply first.

Appoint your Accountable Executive and formalize EoR relationships.

Build a knowledge base  all data, reports, monitoring results, and decisions should be centrally managed.

Establish a public disclosure plan early; transparency reduces reputational risk.

Embed emergency preparedness and community engagement as core practices, not side projects.

These steps not only support compliance but strengthen governance and stakeholder trust.

Closing  a new social contract for mining

GISTM represents more than a technical standard  it’s a new social contract between the mining industry and the world. It demands that operators treat tailings not as a waste management issue, but as a core sustainability challenge tied to human safety, corporate ethics, and environmental stewardship.

For mining to maintain its license to operate, GISTM compliance is becoming non-negotiable. And for those who lead in implementation, it’s also a strategic advantage  signaling transparency, responsibility, and long-term resilience.

Sources & further reading: Global Tailings Review; UNEP/PRI/ICMM materials; major company GISTM disclosure reports.