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Tailings Dam Safety: An Engineering Reference

About this reference

This is an original, open technical reference on the monitoring and safe management of tailings storage facilities (TSFs) and their dams, written in plain engineering language. It is adapted from the subject scope of ICOLD Bulletin 194 — Tailings Dams: Safety, Monitoring and Surveillance (2021) and related ICOLD / mining-industry guidance. It is not a reproduction of the copyrighted source text. It is provided for education and field use. Every tailings facility is unique and carries high consequence of failure; this reference is meant to build engineering judgment, not to set minimum standards. Always follow the applicable regulatory regime and the facility's own surveillance plan.

Tailings are the finely ground waste solids left after extracting minerals from ore. They are mixed with water and deposited behind engineered embankments — tailings dams — that are often among the largest man-made structures on Earth. Because they are built from the waste product itself, and raised repeatedly over decades, they demand a distinct and disciplined approach to safety, monitoring, and surveillance.

This reference walks through that approach: understanding how tailings facilities fail, building a risk-informed monitoring program, selecting and maintaining instruments, and turning measurements into defensible decisions.

Scope of this reference

This book covers the fundamentals and current state of practice for the safety, monitoring, and surveillance of tailings storage facilities, organized into the following chapters:

# Chapter What it covers
1 Introduction: Purpose, Scope, and Organization Why tailings safety is distinct; how this reference is organized
2 Tailings Facilities and How They Fail Facility types and the dominant failure modes
3 Monitoring Philosophy for Tailings Visual surveillance and instrumentation as complementary pillars
4 Planning a Tailings Monitoring Program A risk-informed, consequence-driven planning process
5 Instrument Families for Tailings Survey, geotechnical, hydrologic, and remote-sensing tools at a glance
6 Pore Pressure and Liquefaction-Potential Monitoring The central role of pore pressure in tailings failures
7 Seepage and Phreatic-Surface Monitoring Quantifying and interpreting seepage and beach geometry
8 Deformation Monitoring: Survey and Geotechnical Surface and internal movement detection
9 Automated, Remote, and Real-Time Systems Dataloggers, telemetry, satellite radar, and alarms
10 Installation, Operation, and Maintenance Sustaining reliable data over the life of the facility
11 Data Acquisition, Management, and Databases Frequencies, validation, and data systems
12 Data Evaluation and Interpretation Baselines, trends, and separating signal from noise
13 Performance Evaluation and Decision Making Triggers, action levels, and emergency response
14 Case Histories Lessons from significant tailings incidents
15 Case Study: Oil Sands Tailings Dams of Northern Alberta A detailed case study of applying dam-safety guidelines to oil sands tailings dams (CDA / Golder) and in-pit dyke instrumentation (Albian)

How to use this reference

  • Start with Chapter 2 and Chapter 4. Failure modes and a risk-informed plan are the foundation of every sound tailings surveillance program.
  • Link to the rest of the knowledge base. The Instrument Families chapter cross-references the Dunnicliff and FHWA manuals for detailed installation procedures.
  • Ask the GTI Doctor. The AI assistant can answer monitoring questions from the wider corpus.

A note on units and terminology

Both SI and US customary units appear in practice; this reference uses the unit set most common to each topic and states conversions where they matter. A tailings storage facility (TSF) includes the impoundment, embankment(s), deposition system, decant, and reclaim works. Surveillance here means the combination of human observation and instrument measurement used to confirm a facility is performing as expected.

Safety first. Instrument data supports, but never replaces, qualified visual inspection and the engineering judgment of a qualified tailings engineer and the facility's dam safety program.

Featured Technical Webinar (Terra Insights / 3vGeomatics): Jagersfontein Tailings Dam Collapse — InSAR Analysis, Pre-Failure Deformation Tracking, and Geotechnical Early Warning.

Complementary Practical Field Resources from RST Instruments & Measurand (Terra Insights)