For most of my 40+ years working in tailings management, “closure” was often something we talked about in the last chapter of a report, years (sometimes decades) after a facility was first built. Closure was a problem for another time, something to be figured out when operations wound down.
That mindset is changing. And in my view, the future of responsible tailings management is clear: closure must be designed into a facility from day one.
Why the Old Approach No Longer Works
Historically, many tailings storage facilities were designed for operational efficiency first. Capacity, deposition, and cost often took priority. Closure was considered later, which often meant:
- Large volumes of water to manage at the end of mine life.
- Steep, difficult-to-revegetate slopes.
- Expensive retrofits and redesigns when regulators or communities demanded a credible closure plan.
The result? Some facilities became long-term liabilities: financial, environmental, and reputational. In some cases, the cost of closure exceeded the value of the commodity that was extracted.
The Shift Toward “Closure at the Start”
Today, the industry is recognizing that this reactive model is unsustainable. New standards, investor scrutiny, and community expectations are forcing operators to rethink their approach.
Designing for closure from day one means:
- Final landform planning up front: Embankments, slopes, and covers are shaped with the end in mind.
- Water balance built for post-closure: Facilities are designed to reduce the amount of ponded water, control runoff, and function under extreme climate scenarios.
- Seepage and geochemistry controls integrated early: Drains, liners, or barriers are installed before tailings are placed, not bolted on later.
- Progressive reclamation: Closure features are implemented in stages during operation, reducing the ultimate burden at the end.
The Business Case for Early Closure Design
This isn’t just about compliance, it’s about value:
- Lower life-cycle costs: Planning closure early often reduces total expenditures compared to late-stage fixes.
- Regulatory approval: Many jurisdictions now require a closure plan prior to construction.
- Investor confidence: Lenders and shareholders increasingly demand proof that closure liabilities are understood and funded.
- Community trust: Local stakeholders want to see a credible vision for what the land will become after mining ends.
Challenges to Overcome
Of course, designing for closure isn’t easy. Uncertainties in ore reserves, tailings production rates, and climate make it difficult to “lock in” a closure design decades in advance of its implementation. Flexibility is key.
Another challenge is cultural: some companies still view closure as a cost center rather than a core design driver. That mindset will need to change if closure-first thinking is to become the standard.
Looking Ahead: Closure as the Future Standard
In 20 years, I believe we’ll look back and wonder why closure wasn’t always designed from the start. Just as filtered tailings and real-time monitoring are becoming standard today, closure-driven design will be a baseline expectation tomorrow.
Future tailings facilities will likely:
- Operate with closure-ready geometry from the first lift.
- Include built-in systems for long-term water and seepage control.
- Achieve progressive reclamation milestones while still active.
- Demonstrate a safe, stable, and sustainable post-mining land use—before the first ton of tailings is placed.
Final Thoughts
We’ve learned the hard way that ignoring closure until the end only multiplies risks and costs. The next generation of engineers and mine operators won’t have that luxury.
Designing for closure from day one isn’t just good practice: it’s the future standard. And if we embrace it fully, we can turn one of mining’s greatest liabilities into an opportunity for lasting positive legacies.