Three workers sheltered in a refuge station while rescue crews worked to reach them.
In the mountains of northwestern British Columbia, a province has chosen to press forward where the earth once pushed back. British Columbia has approved an amended environmental assessment allowing Red Chris Mine to transition from open-pit to underground block-caving operations — less than a year after three workers were trapped more than 500 metres below the surface for over two days before being rescued. The Tahltan Central Government, on whose territory the mine sits, consented to the change, and regulators attached 27 binding conditions covering water, air, and ground stability. It is a decision that asks whether institutional safeguards, forged in the aftermath of near-tragedy, can be trusted to hold where rock once could not.
- Three workers descended into Red Chris Mine last July to drill for the very underground method now being approved — and were trapped by two separate collapses for more than two days before rescue crews reached them.
- The incident cast a long shadow over the approval process, raising urgent questions about whether a mine that had already shown its dangers should be permitted to go deeper and further underground.
- Rather than halting the project, British Columbia's Environmental Assessment Office continued its review, ultimately granting the amended certificate with the consent of the Tahltan Central Government.
- The approval carries 27 binding conditions requiring continuous monitoring of ground stability, water quality, and air quality — a direct response to the collapse risks that endangered the trapped workers.
- Block-caving, which extracts ore by engineering controlled underground collapses, now moves from theoretical risk to operational reality at a site where that risk has already materialized in human terms.
British Columbia has approved underground mining at Red Chris, a copper and gold operation in the province's northwest currently running as an open pit. The amended environmental assessment certificate authorizes block-caving — a technique that extracts deep ore by allowing controlled collapse of the rock above it. The decision comes less than a year after three workers at the same site were trapped more than half a kilometre underground.
Last July, those workers descended to conduct exploratory drilling as part of the mine's planned transition to this very method. Two separate collapses occurred while they were at depth, leaving them stranded in darkness. They sheltered in a hardened refuge station designed for such emergencies while rescue crews worked to reach them. More than two days passed before they were brought safely to the surface.
The incident did not derail the project. The Environmental Assessment Office completed its review, and the Tahltan Central Government — whose territory encompasses the mine — consented to the change. Regulators approved the certificate on that basis.
The approval is not unconditional. Twenty-seven binding requirements accompany the certification, mandating ongoing monitoring of water quality, air quality, and ground stability — the very factor behind last year's collapses. The conditions are designed to catch problems before they become crises and to ensure the underground transition does not repeat the dangers already lived by the workers who were trapped.
Block-caving is used globally, but it operates out of sight, where rescue and response are far more complex than in open-pit mining. At Red Chris, the risks are no longer theoretical. The question now is whether 27 conditions and the lessons of July will be enough to keep the next crew safe as the mine goes deeper.
British Columbia has given the green light to underground mining at Red Chris, a copper and gold operation in the province's northwest that already runs as an open pit. The approval came this week in the form of an amended environmental assessment certificate authorizing block-caving—a method that extracts ore from deep underground by allowing carefully controlled collapse of the rock above it. The decision arrives less than a year after three workers at the same site were trapped more than half a kilometre below the surface.
Last July, those three workers descended into the mine to conduct specialized exploratory drilling. Their work was part of the mine's planned transition to this very underground method. While they were at depth, two separate collapses occurred, trapping them in the darkness. But the operation's safety systems held. The workers sheltered in a refuge station—a hardened compartment designed for exactly this kind of emergency—and remained secure while rescue crews worked to reach them. More than two days passed before they were brought back to the surface, shaken but unharmed.
The incident did not stop the project. Instead, the province moved forward with its review. The Environmental Assessment Office examined the proposal, and the Tahltan Central Government, whose territory encompasses the mine, consented to the change. On that basis, regulators approved the amended certificate.
The approval is not unconditional. The province has attached 27 binding requirements to the certification. These conditions mandate ongoing monitoring of water quality and air quality around the site, as well as continuous assessment of ground stability—the very factor that led to the collapses that trapped the workers. The conditions are meant to catch problems before they become crises, to track the mine's impact on the surrounding environment, and to ensure that the transition to underground operations does not repeat the dangers of the past year.
Block-caving is an established mining technique, used globally to extract ore from deep deposits. It is also inherently different from open-pit mining: it happens underground, out of sight, where rescue and response become more complex. The Red Chris operation will now pursue this method at a site where the risks are no longer theoretical. The workers who were trapped have already lived through what can go wrong. The question now is whether the 27 conditions, and the lessons learned from July, will be enough to keep the next crew safe as the mine goes deeper.
Notable Quotes
The workers were performing specialized exploratory drilling for the mine's transition to the block-cave mining method when they were trapped.— British Columbia government statement
The Hearth Conversation Another angle on the story
Why did the province approve this after workers were just trapped underground?
The entrapment wasn't a reason to stop—it was treated as a test of the safety systems. The workers survived because the refuge station worked. That became evidence the method could be managed.
But doesn't that feel like moving forward too fast?
It might. But the mine was always going to go underground eventually. The question became: under what conditions? That's where the 27 requirements come in—they're supposed to be the guardrails.
What does block-caving actually do differently from open-pit mining?
Open-pit is what you see—they dig down and out, removing rock from the surface. Block-caving is controlled collapse deep underground. You let gravity do the work, but you have to predict and manage every fracture. It's more efficient but less forgiving.
And the Tahltan Central Government consented to this?
Yes. They have authority over the territory. Their consent was part of the approval process. Whether that reflects full community support or pragmatic acceptance of an inevitable project—that's a separate question.
What happens if there's another incident?
The monitoring conditions are supposed to catch instability before it becomes a collapse. But monitoring is reactive. It tells you something went wrong. It doesn't always prevent it.