How Does Early Mine Closure Planning Facilitate Flexibility?

A common misconception is that integrating closure early forces premature commitment to a final end state. In practice, the opposite is true. Effective early closure integration does not fix outcomes; it recognizes the longer-term impact of decisions, and uses that information to establish boundaries and constraints while preserving freedom within those bounds. Maintaining optionality is, therefore, not about keeping every option open indefinitely but is about maintaining a bounded set of viable alternatives and reducing the likelihood of early decisions, made with incomplete information, that dictate closure.

The challenges associated with water management can be used to illustrate the economic benefits of maintaining optionality as long as possible. Operational water management systems are designed to meet water volume and quality forecasted during operations which is likely suboptimal for closure conditions. This can result in permanently treating elevated volumes of water, reliance on active treatment systems, and long‑term liabilities that persist for decades. While primarily driven by operational requirements, these systems can unintentionally turn short‑term water management risks into long‑term liabilities, including ongoing treatment requirements or perpetual discharge obligations.

Integrating closure design considerations early could introduce risk mitigation, such as landforms designed to reduce contact water. Decreasing the volume of water requiring treatment may present options for passive and semi-passive water treatment technologies, which have more flexibility to adapt over time, allowing operators to reduce both operating expenditures and closure costs (O’Kane et al., 2023).

Finding the Value in Informed Decision Making

Maintaining the ability to defer high-consequence decisions not only impacts capital and operating expenses but can directly influence asset value, particularly during early development and permitting phases. The implications and outcomes extend far beyond the regulatory compliance requirements that closure planning traditionally satisfies. Rather, this approach aligns the development phase of the project lifecycle with the growing practice among institutional investors and sovereign wealth funds of integrating environmental, social, and governance metrics, and forecasted performance into assessments of project value and capital efficiency.

Examples of this approach are illustrated in the Global Investor Commission on Mining 2030’s  Positive Legacies for Mine Closure and Post Closure Transition. It is noted that “investors and stakeholders…now scrutinize how mining companies plan to mitigate the impacts of their activities that will endure beyond the life of the mine,” and that if legacy issues are neglected or poorly managed, they can lead to the realization of substantial liabilities well into the future.

Projects that align with this trend and preserve multiple pathways for closure and post-mining land use (PMLU) will be viewed as inherently less risky, as they can adapt to changing regulatory expectations, evolving environmental data, and shifting stakeholder priorities without requiring fundamental and costly redesign. This further reduces the likelihood of delays or regulatory friction and improves the defensibility of closure strategies, as decisions are based on appropriate information rather than made prematurely. As a result, these projects are better positioned to attract capital on more competitive terms.

This also translates into more accurate closure estimates. This is particularly important where long‑tail liabilities, such as perpetual water treatment, would otherwise dominate closure estimate uncertainty. In many cases, decisions that impact long-term treatment requirements are made years before final closure treatment requirements are defined.

Early closure integration also helps identify low-risk actions, such as implementing measures or defining those key decision inflection points, that provide immediate benefit while preserving future flexibility. Some low-risk actions include interim cover systems that reduce oxidation but can be reworked as site conditions demand, progressive reclamation aligned with evolving mine plans, or water controls that scale with site conditions. These actions reduce ongoing risk and cost without constraining future options.

Okane’s Approach

It’s important to remember that the cost of preserving optionality during operations is typically low and predictable, but the cost of recovering optionality later is high and uncertain. Poorly timed or overly prescriptive decisions, such as prematurely locking in final landform designs, can eliminate flexibility and incur a higher cost to revise when conditions change.

Okane’s approach to integrated closure planning recognizes this reality. We embed closure decision-making within an operational framework to develop adaptable risk management strategies as mine site information matures.

For example, Okane evaluated multiple closure alternatives for a gold mine in South America to identify optimal closure outcomes for the site’s TSF, while avoiding locking in decisions under uncertainty using the following strategies and workflows:

• Structured alternatives assessment process that included an initial registry of eight closure options screened against fatal flaw criteria and progressed four surviving options into “strategy clusters” for further evaluation.

• Workshop-based assessments using agreed-upon metrics, weights, and scoring to consistently compare closure strategies against key technical criteria, corporate guidance, and regulatory requirements. This established a comprehensive and repeatable evaluation process that could be relied upon in the future to confirm the final selected alternative or identify opportunities to transition to a new preferred alternative.

• Staged and modular execution concepts which included sequenced execution milestones such as strategically delaying cover placement, thereby preserving the ability to adapt to future conditions based on monitoring results.

Several feasible closure strategies were established using this process, but a preferred alternative was not selected because key information gaps were identified during the process and created uncertainty. Instead, Okane documented those gaps and provided a targeted supplemental study and data collection plan to reduce uncertainty in future decisions. This approach reduced the risk of locking in irreversible commitments too early in the project’s lifecycle. This minimized the risk of early, irreversible closure commitments and preserved decision optionality until high-confidence inputs become available.

Integrated mine and closure planning enables projects to manage uncertainty and provides decision-gate holders (i.e., operators, regulators, rightsholders, and local communities) with timely, relevant data to reduce lifecycle costs, improve risk-adjusted asset value, and maintain strategic flexibility in the face of uncertainty. In a sector where long-term and long-tail liabilities influence project viability, optionality is not just a theoretical benefit—it is a tangible lever for better lifecycle value and operational outcomes.

To learn more about developing optionality to de-risk operations and improve project lifecycle value, contact our team at info@okaneconsultants.com.

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