SITELIVE 
The number the industry published about itself
In September 2025 the International Council on Mining and Metals published its Tailings Progress Report, aggregating what its 24 company members disclosed at the 5 August 2025 final conformance deadline for the Global Industry Standard on Tailings Management. Of 836 member-operated facilities, 558 — 67 per cent — were in full conformance; 278, or 33 per cent, were in partial conformance, meaning some requirements are fully met and others are partially met or not met. The distribution matters more than the headline: over 80 per cent of facilities classified as extreme or very high consequence were fully conformant, at 84 and 81 per cent respectively, while high, significant and low consequence facilities ranged from 65 down to 53 per cent. ICMM's own framing is unusually plain — achieving full alignment is taking more time than initially anticipated, and remains a work in progress.
What the standard actually demands
The GISTM was published in August 2020, developed by an independent review co-convened by ICMM, UNEP and the Principles for Responsible Investment after the January 2019 failure at Vale's Córrego do Feijão facility in Brumadinho killed 272 people. It runs to six topic areas, 15 principles and 77 auditable requirements spanning the full lifecycle from site selection to post-closure. Its machinery is governance as much as engineering: every facility carries a consequence classification from extreme to low, validated by the Engineer of Record and subject to review by an Independent Tailings Review Board or a senior independent technical reviewer, with named accountable roles including a Responsible Tailings Facility Engineer and an Accountable Executive. BHP's disclosure in the ICMM report describes standardising precisely that — appointing those roles and building direct engagement between technical specialists and the Accountable Executive across its portfolio.
The sensing stack that is actually in the ground
Monitoring is the part the industry has genuinely rebuilt. Vale, whose failure triggered the standard, now runs three geotechnical monitoring centres established from 2019 across its North, Southeast and South corridors in Pará and Minas Gerais, operating 24 hours a day and seven days a week using radar, connected sensors, video surveillance, drones and sirens, with water-level instrumentation at multiple points and instruments measuring dam response to seismic activity. At the Gongo Soco site the company has described radars and robotic total stations detecting millimetric movement, with real-time video watched both locally and at the monitoring centre. Commercially, ground-based radar has become the backbone: GroundProbe, part of Orica's Geosolutions group, deploys slope stability radars on and near dam structures for continuous sub-millimetre wall-stability data, feeding thresholds and alarms into Trigger Action Response Plans, alongside piezometers, inclinometers, pressure cells and drone photogrammetry.
What satellites add — and what they do not
Satellite interferometric SAR extends coverage to structures nobody has instrumented. Copernicus Sentinel-1 provides free, open C-band radar with a six-day repeat cycle at the equator from a two-satellite constellation; Sentinel-1A's mission ended in June 2026, with Sentinel-1C and Sentinel-1D now flying the pairing. That gives wide-area, millimetre-scale displacement history over legacy facilities, closed structures and third-party dams upstream or downstream of your own. But a peer-reviewed 2024 study in the Bulletin of Engineering Geology and the Environment, which ground-truthed Sentinel-1 at a test site and ran forensic analyses of five failure cases, reached a conclusion the sales material tends to omit: medium-resolution Sentinel-1 InSAR serves as a hazard-screening tool to guide where targeted investigation should happen, and most potential failure modes may not exhibit InSAR-detectable accelerations that would assist real-time time-of-failure prediction. The authors recommend long-term programmes combine remote sensing with field instrumentation rather than substituting one for the other.
Why the conformance gap is boring, and therefore real
The reasons ICMM gives for the shortfall are not evasions. Older facilities were designed and built under previous standards and have incomplete records, and conformance requires a detailed site characterisation covering climate, geophysical, geochemical and hydrogeological properties — which in practice means new drilling and laboratory testing to fill gaps in geotechnical material characterisation and construction history. Social performance is not a side chapter either: engagement requirements span all six topic areas and account for roughly 41 per cent of the standard's requirements, and they describe a continuing process of dialogue rather than a document to be produced once. Climate resilience adds a rolling obligation to update models, management plans, water treatment and spillway capacity. None of that is a dashboard problem. It is field programmes, engineering hours and years.
The economics nobody puts in the press release
Monitoring is the cheap end of tailings risk. Radar, piezometers and an InSAR subscription are small numbers against investigation drilling, buttressing, dam raises, water balance management, filtered or thickened tailings conversion, and closure design — and no instrument changes a facility's consequence classification or the population living beneath it. The instruments also carry their own failure modes: InSAR coherence degrades over vegetated ground and active tailings beaches, line-of-sight geometry means a satellite may be blind to the very displacement direction that matters on a particular embankment, and brittle static liquefaction of loose saturated tailings can develop with little precursory surface movement to detect. Alarm fatigue is the quiet risk: a system that emits thresholds nobody acts on is worse than no system, because it manufactures the appearance of control.
What it means for operators
In Australia, tailings duties already sit in statute — Western Australia's code of practice for tailings storage facilities is issued under the Mines Safety and Inspection Act 1994 and the Mining Act 1978, and codes of practice are admissible in court — while the GISTM has become the de facto expectation of lenders, insurers and offtake counterparties well beyond ICMM's membership. The practical implication for any operator, at any scale, is that monitoring counts only when it is wired to a Trigger Action Response Plan with named accountable roles and a demonstrable trail: which threshold was exceeded, who was notified, what action was taken, when it closed out and who verified it. That is the artefact an Engineer of Record, an independent review board and a regulator will each ask for, and it is the one most often reconstructed after the fact rather than captured as it happened.