Reviewing the assumptions in a mining investment model

An early-stage mining model may contain a mixture of test results, supplier quotations and estimates that have not yet been verified. Review those inputs before relying on the projected cash flow.

Assign a source, date and confidence level to the assumptions that drive the result. It also identifies the further work needed before a capital commitment can be considered.

Geological confidence

Identify the work supporting the grade, tonnage and continuity assumptions. Ask who collected the data, how it was reviewed and what additional work is needed. Distinguish observed information from extrapolation.

JORC’s reporting framework exists to distinguish different categories of technical information and confidence. A claim about a mineral occurrence should not be treated as an independently established reserve or mine plan. ^[1]

Processing and product acceptance

Review the basis for the proposed recovery and product specification. Ask whether representative material has been tested through a suitable route and whether the intended receiver has evaluated the product.

In the model, keep feed grade, recovery and payability separate. Changing one is not necessarily a substitute for changing another. Where an input is preliminary, show its range and explain what evidence would narrow that range.

Execution and infrastructure

Investigate the dependencies required to start and sustain operations: access, equipment, power, water, people, maintenance and logistics. Link each major dependency to an owner, a cost estimate and a realistic decision point.

Test delays explicitly. A project may require more cash when revenue starts later even if its long-run operating assumptions remain unchanged. A monthly cash schedule can reveal pressure that an annual profit projection hides.

Environmental and social obligations

Identify the assessment work, operating controls and community-related issues relevant to the project. The IFC Performance Standards provide an established reference for considering environmental and social risks and impacts. They are not evidence that a particular project has been assessed or approved. ^[2]

Ask what costs and schedule allowances are included for required work. Treat unresolved obligations as part of the project case, not a footnote to be addressed only after funding.

Commercial and counterparty exposure

Check how prices, product acceptance and payment assumptions enter the model. Separate signed arrangements from discussions and indicative interest. Consider the consequences of losing a receiver or needing to change the delivery route.

Review concentration: one customer, one contractor, one access route or one source of operating funds may create a dependency worth examining. The appropriate response depends on the facts, but the dependency should be visible.

Work with scenarios rather than a single answer

Start with an explicitly defined base case. Then test lower realised prices, slower ramp-up, weaker recovery, higher costs and a delayed start. Also test combinations, since problems do not always occur in isolation.

Document where each scenario ceases to be financially or operationally workable. For each material downside, identify the evidence or change in terms that would be needed before the next commitment.

Stage the decision

Tie funding discussions to defined work and review gates. The first commitment may be to establish missing technical or legal facts, not to finance a complete operation. Preserve the ability to stop when the evidence does not support proceeding.

Mining investments can involve substantial loss, including loss of invested capital. This article is educational and does not assess a specific opportunity, investor’s suitability or applicable offering requirements. Independent technical, legal, tax and financial advice is essential to a transaction-level decision.