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To evaluate a gold project before production, verify what is actually known about the deposit, how much of it qualifies as a reserve under the governing reporting code, whether the study’s mining and processing plan is supported by evidence, and whether its economics and approvals withstand scrutiny. A resource estimate, feasibility label, positive NPV, or permit application alone does not mean a mine will be built. Work through the technical report, assumptions, sale route, and remaining dependencies in that order.
How do you evaluate a gold mining project before production?
Start with the project’s jurisdiction, reporting standard, and technical report date. Then separate exploration results, mineral resources, and mineral reserves; assess the maturity of the study and its evidence; trace the economic model back to its assumptions; and check the permitting, infrastructure, sales, community, and closure work that remains. The goal is not to predict production from a headline number. It is to identify what has been established, what is assumed, and what could still delay or undermine the plan.
This is a general due-diligence framework, not a valuation or verdict on a particular asset. A project’s figures and risks must be attributed to its own dated technical report or filing. Legal reporting duties and terminology vary by jurisdiction, so interpret technical claims under the code that governs the disclosure rather than treating all standards as interchangeable.
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Before comparing ounces or study results, identify where the project is located, which reporting regime the disclosure uses, the report’s effective date, and the qualified or competent persons responsible for its technical disciplines. Those details tell you both what the terms mean and how current the underlying work may be.
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- JORC: The Joint Ore Reserves Committee describes its code as setting minimum standards for public reporting of exploration results, mineral resources, and ore reserves. Its page identifies the 2012 edition as the current code.
- Canada’s NI 43-101: The instrument sets disclosure requirements for mineral projects, including technical-report content, estimate dates, and methods. The cited source is the Government of British Columbia’s version of the instrument.
- U.S. SEC S-K 1300: U.S. mining disclosure rules use qualified-person technical report summaries and define study and resource concepts. The SEC adopted its mining disclosure amendments on October 31, 2018; the rules applied for fiscal years beginning on or after January 1, 2021.
These frameworks share broad concepts, but their terms and legal requirements should not be assumed to match one for one. If a company presents figures under one code alongside figures prepared under another, look for a reconciliation or explanation before comparing them.
Check whether the technical report still describes the project
Use the report’s effective date, not just the date of a recent announcement. A report may no longer reflect the project if its resource estimate, engineering, permits, ownership, costs, gold-price assumptions, or mine plan have changed. Compare later company disclosures with the assumptions and design in the report. A newer announcement does not automatically update every technical conclusion in an older study.
Record who takes responsibility for each relevant technical discipline and what methods and assumptions the report describes. Technical reports are a starting point for verification: the public summary should be consistent with the detailed report and with later disclosures. A general framework cannot establish whether an individual project’s report is stale; that requires comparing the project’s dated documents.
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A mineral resource is an estimate of mineralization that meets the applicable code’s criteria, including geological evidence and assumptions about potentially justifiable technical and economic conditions. Under SEC S-K 1300, it considers factors such as cut-off grade, likely mining dimensions, location, and continuity. It is not simply all the gold encountered in drilling.
A mineral reserve is the economically mineable portion of measured or indicated resources after applying relevant modifying factors. Those factors include technical, economic, legal, environmental, social, and governmental considerations; reserve estimates also account for dilution and mining losses. Classification as a reserve is therefore more than a statement that gold is present: it reflects a studied mine plan and the factors that affect its extraction.
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How confidence categories affect what the numbers mean
Under the SEC framework, resource categories reflect increasing geological confidence from inferred to indicated to measured. Reserve categories also carry differing confidence: proven and probable reserves are derived from eligible resource categories subject to the qualified person’s confidence in modifying factors. The table summarizes the distinctions relevant to evaluating a disclosure; apply the specific code named in the project’s report.
| Reported category | What to understand | Evaluation implication |
|---|---|---|
| Inferred resource | The lowest geological-confidence resource category in the SEC framework. | Do not treat it as a reserve. Under the cited U.S. rule, inferred resources cannot support a pre-feasibility study’s demonstration of reserve viability or be converted to reserves without new evidence supporting a higher resource category. |
| Indicated resource | A resource category with greater geological confidence than inferred. | Under SEC S-K 1300, indicated resources may convert to probable reserves, not proven reserves. |
| Measured resource | The highest geological-confidence resource category in the SEC framework. | It may convert to proven or probable reserves, depending on the qualified person’s confidence in the modifying-factor results. |
| Probable reserve | A reserve category based on eligible resource material and application of modifying factors. | Read it as part of the mineable inventory under the stated plan, not as evidence that every approval, contract, or construction decision is complete. |
| Proven reserve | A reserve category associated with measured resources and sufficient confidence in modifying factors. | It indicates a higher level of confidence in the reserve estimate, but does not guarantee a mine will be financed, built, or operated as forecast. |
The SEC-specific conversion rules above should not be generalized to every jurisdiction without checking the local code. For example, the SEC rule expressly bars inferred resources from a reserve-viability demonstration in a pre-feasibility study. The key diligence question is whether the project’s reported categories are being used consistently with its governing standard.
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What to record for every estimate
For each category, capture tonnes, grade, contained gold, cut-off grade, effective date, estimation assumptions, and whether the estimate is included in the proposed mine plan. Also note the code and any reconciliation between versions. “Ounces” alone hides material differences: the figure could refer to inferred resources, indicated resources, measured resources, reserves, or a mix of categories with very different confidence and economic significance.
Keep exploration targets and drilled mineralization separate from reported resources and reserves. An exploration target is not a reserve or a discovery of mineable gold. Do not add it to the mine’s economically mineable inventory or compare it with reserve ounces as if the categories were equivalent.
What should you look for in a mining study?
Read the actual study or technical report, not only a press-release summary. Establish whether the work is an initial assessment, a pre-feasibility study, or a feasibility study, then ask whether the technical evidence is appropriate for that stage. Study labels describe different levels of development; they are not guarantees of execution.
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Under SEC S-K 1300, a pre-feasibility study is more comprehensive than an initial assessment but less comprehensive than a feasibility study. It evaluates options, selects an underground mining method or surface pit configuration, identifies an effective processing method, and includes a plan to sell the product. Check whether the project’s claimed stage is matched by that kind of defined plan and supporting work.
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Trace the mine and process plan
Follow the plan from the resource estimate through mine design, ore delivery, processing, and product sale. Look for evidence supporting the assumptions at each link, including:
- Geology and sampling: How the deposit is modeled, what sampling supports the estimate, and how continuity and cut-off assumptions relate to the proposed mine plan.
- Mining method and design: Whether the chosen surface or underground configuration is described and supported, including geotechnical and hydrological conditions, dilution, mining losses, and recovery assumptions.
- Metallurgy and processing: The test work behind the proposed flowsheet, expected recovery, throughput, and process route. Identify assumptions that rely on unproven recovery or incomplete test work.
- Waste, tailings, and water: How the study handles waste rock, tailings, and water management, including the facilities and approvals required.
- Infrastructure and operations: The basis for power, water, transport, workforce, and schedule assumptions, and whether essential services or facilities are secured or still depend on outside parties.
Check whether the engineering and test work underpinning the design are developed enough for the stated study stage. A plan that depends on a processing route not adequately tested, infrastructure not secured, or a schedule that assumes unresolved approvals deserves closer scrutiny. The report should discuss material risks and relevant methods; the details are project-specific and cannot be inferred from the study title.
How do you test the project’s economic case?
Do not evaluate a project from a single NPV, IRR, or payback figure. Rebuild the logic of the study’s annual production and cash-flow forecasts, and identify which assumptions drive the result. A positive base case is a forecast under stated conditions; it does not establish that financing, permits, construction, or operating performance will follow as modeled.
Make an assumptions checklist
Record the economic inputs and confirm their basis in the report. The important items include:
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- Gold price, currency, exchange rate, and the period or rationale used to select the price.
- Ore grade, recovery, throughput, mine life, annual production, and mine schedule.
- Initial and sustaining capital, operating costs, and sales, refining, or transport charges.
- Taxes, royalties, working capital, financing costs, and whether the analysis is pre-tax or post-tax.
- Closure and reclamation costs, discount rate, and the timing of cash flows.
NI 43-101 technical-report provisions call for justified principal assumptions, annual cash-flow forecasts, and sensitivity analysis. SEC S-K 1300 requires detailed economic analysis for a pre-feasibility or feasibility study and disclosure of the selected commodity price and its rationale. Use those requirements to test what the report explains; do not assume that a headline economic result captures every cost or liability.
Read sensitivities as a map of fragility
Examine sensitivity cases for gold price, grade, recovery, capital, operating costs, and other material variables. Ask how much each change affects the economics and which assumptions have the greatest leverage. Also check whether the cases are presented on a consistent pre-tax or post-tax basis and whether they reflect the project’s stated schedule and costs.
There is no universal acceptable NPV, IRR, payback period, or study-accuracy threshold established by the cited standards for every gold project. A result has meaning only in the context of its assumptions, timing, risk, and the evidence supporting those inputs. Do not substitute a generic cutoff for examining the project’s own sensitivity and remaining dependencies.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can the mine sell what it plans to produce?
A production forecast is only one part of the route to revenue. Check the expected product form and specifications, any refining or treatment requirements, transport route, buyer assumptions, and material sales terms. Determine which sales contracts are signed and which remain under negotiation, rather than treating a proposed buyer or sales route as secured.
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What can stop or delay a gold project from reaching production?
Geology and economics do not settle the path to construction. A project can have a reserve and positive modeled economics while still facing unresolved approvals, infrastructure needs, community matters, or third-party dependencies. Build a project-specific register rather than relying on a general statement that permitting is underway.
Track the approvals and obligations
For each material item, note its status, responsible party, dependency, and effect on the planned schedule. Include:
- Permits and other government approvals, including the sequence and dependencies among them.
- Land and mineral tenure, water rights, environmental studies, and environmental compliance requirements.
- Waste and tailings approvals, water and waste management plans, and reclamation or closure obligations.
- Power, water, transport, and other infrastructure access, including services that depend on third parties.
- Community negotiations or agreements and any other material social matters identified in the report.
- Closure costs, financial assurance, reclamation bonds, or other required security.
NI 43-101 technical-report items expressly address environmental issues, waste and tailings, water management, permit status, reclamation bonds, community matters, and closure costs. Use the report’s discussion to identify what is complete, what remains conditional, and what must happen before construction or operation. An application filed is not the same thing as an approval obtained.
Interpret reserve status carefully
A reserve classification does not by itself mean every permit or sales contract is in hand. Under the cited SEC rule, however, a qualified person must have reasonably investigated obstacles and reasonably believe that approvals and contracts are highly likely to be obtained in a timely manner; unresolved material matters contingent on third parties must be considered. Treat this as a substantive diligence point, not a guarantee that an authority, buyer, community, or service provider will agree on the expected terms or timeline.
How should you compare two gold projects?
Only compare projects after aligning their reporting codes, estimate dates, definitions, and study stages. A larger contained-ounce figure is not inherently the stronger project if it has lower confidence, a less mature plan, or greater execution dependencies. Use consistent axes and preserve the underlying categories rather than compressing unlike facts into one ranking.
| Comparison axis | What to align |
|---|---|
| Resource and reserve confidence | Categories, grade distribution, estimate dates, codes, cut-off assumptions, and the relationship of the estimate to the mine plan. |
| Study and engineering maturity | Study stage, level of engineering, test work, and how well the selected mine and process plans are supported. |
| Mining and processing risk | Mining method, geotechnical and hydrological assumptions, dilution and losses, recovery, flowsheet, tailings, and waste management. |
| Infrastructure and schedule | Power, water, transport, workforce, facilities, schedule assumptions, and third-party dependencies. |
| Costs and economics | Capital and operating cost basis, price and exchange-rate assumptions, taxes and royalties, cash-flow treatment, and sensitivity cases. |
| Market route | Product specifications, processing or refining needs, transport, buyers, and which contracts are signed or under negotiation. |
| Execution obligations | Tenure, permits, environmental matters, closure costs and security, community matters, and remaining approvals. |
The standards identify these as material considerations, but they do not prescribe a universal weighting for them. How much weight each deserves depends on the project and the evidence available. Keep uncertainties visible rather than disguising them in a single score or headline metric.
A practical diligence sequence
- Identify the rulebook. Record the jurisdiction, reporting code, technical report effective date, and responsible qualified or competent persons.
- Normalize the inventory. Separate exploration targets, resources, and reserves; list category, tonnes, grade, contained metal, cut-off grade, date, and mine-plan inclusion.
- Test the study stage. Confirm whether the work is an initial assessment, pre-feasibility study, or feasibility study and whether its design and test work support that level.
- Trace the technical chain. Follow geology through mining, processing, tailings, infrastructure, schedule, and product sale; mark assumptions or services that remain unproven or unsecured.
- Reconstruct the economics. Capture price, exchange rates, throughput, recovery, schedule, costs, taxes, royalties, discounting, closure, and the basis of annual cash flows.
- Interrogate sensitivities. Identify the assumptions with the greatest effect on the result and how materially weaker conditions change the case.
- Map execution dependencies. Record permits, tenure, water, tailings, infrastructure, community matters, contracts, closure obligations, and third-party decisions with their statuses.
- Reconcile later disclosures. Compare current project statements against the dated report and flag changed assumptions, figures, ownership, plans, or approvals.
This sequence turns a promotional summary into a set of checkable claims. It does not replace technical, legal, environmental, or financial review of a named asset, but it helps a reader distinguish established evidence from company forecasts and unresolved conditions.
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