MineArchiveCavanacaw rockfall and water inrush, 2018
Over-charging with explosives brought down 150 tonnes of rock from an underground roadway roof at Cavanacaw Gold Mine, narrowly missing a worker, before the resulting unstable ground let surface water flood into the workings, further endangering the underground workforce.
| Date | July 2018 |
|---|---|
| Mine | Cavanacaw Gold Mine |
| Region | County Tyrone |
| Primary type | Collapse / Roof Fall |
| Associated types | Flooding / Inundation |
| Fatalities | 0 (No fatalities or reported injuries — HSENI's investigation found the rockfall narrowly missed a worker and that the failure 'could have resulted in fatalities'.) |
| Context | During active mining |
Cause
The immediate cause was the use of too many explosives in a single blast, bringing down around 150 tonnes of rock from the roof of an underground roadway.
Contributing factors
The resulting disturbed, unstable ground then allowed an inrush of surface water into the mine, flooding part of the workings and exposing underground employees to a further risk of drowning.
What happened
In July 2018, a blast using an excessive quantity of explosives at Cavanacaw Gold Mine, Omagh, brought down some 150 tonnes of rock from the roof of an underground roadway, narrowly missing an employee working underground at the time. The disturbed ground above the failed roadway then allowed water to migrate down from the surface, flooding part of the mine and putting underground workers at further risk of drowning.
Investigation & inquiry
The Health and Safety Executive for Northern Ireland (HSENI) investigated the incident and prosecuted Flintridge Resources Limited, the mine's operator, under Article 4(1) of the Health and Safety at Work (Northern Ireland) Order 1978. The company pleaded guilty at Dungannon Crown Court.
Legal & regulatory aftermath
Flintridge Resources Limited was fined £120,000. HSENI Principal Inspector Brian Pryce stated that 'the failure of the mine operator to ensure that suitable measures were put in place resulted in employees being exposed to unnecessary risk which could have resulted in fatalities', and that 'mine operators must ensure that suitable ground control measures and precautions are in place to prevent falls of ground and inrushes.'
Recorded claims
Individual factual claims, each attached to the source(s) that support it below. Where sources disagree, both are kept.
- Flintridge Resources Limited pleaded guilty at Dungannon Crown Court and was fined £120,000 for the health and safety failures behind the incident. 1,2
Related terminology
Mining terms this disaster is structurally linked to, with the nature of the relationship.
- Gold (contextual relationship)
What a modern gold-mining incident in the UK looks like: over-charging with explosives at the working Cavanacaw mine brought 150 tonnes of roof down, narrowly missing a worker. - Inrush (contextual relationship)
The rockfall left ground unstable enough for surface water to pour into the workings afterwards, flooding part of the mine and putting the underground workforce at risk of drowning. - Roof Fall (contextual relationship)
Named in this record’s aftermath: “…ground control measures and precautions are in place to prevent falls of ground and inrushes.'”
Sources
- (primary) Operators of Omagh based gold mine fined following health and safety failures — Health and Safety Executive for Northern Ireland (HSENI)
- (secondary) Northern Irish gold mine operators fined following H&S failures — Institute of Materials, Minerals and Mining (IOM3)
Record created: 20 August 2026 · Last researched: 20 August 2026