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Start with the company’s business and project stage
Before reading a resource table, identify what the company actually owns and what it is trying to do. A producing company sells metal and can be tested against production, sales, costs, cash flow, and guidance. A developer is valued largely on a proposed mine plan, financing, permitting, construction and ramp-up. An explorer may report a resource without a demonstrated mine or economic project.
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Separate producers, developers and explorers
- Producer: Check current and historical production, payable sales, realized prices, cash costs, all-in sustaining costs (AISC), sustaining capital and operating cash flow. History does not eliminate future risks, but it gives you evidence of how the asset performs.
- Developer: Focus on the latest preliminary economic assessment, prefeasibility or feasibility study, permitting status, construction schedule, expected capital, funding plan, recovery assumptions and sensitivity cases. Study outputs are plans, not operating results.
- Explorer: Examine drilling quality, geological continuity, resource category, metallurgy, infrastructure and the work needed to advance the project. A large inferred resource is not equivalent to a mine, reserve or cash-generating asset.
Record ownership and attributable production
Use the company’s ownership percentage and distinguish 100%-project figures from the portion attributable to shareholders. Joint ventures, streaming or royalty arrangements, and minority interests can make a project’s headline production differ materially from the company’s reported sales. Put the ownership basis beside every reserve, resource, production and cost figure you record.
Do not treat a mineral resource as a mineral reserve
Reserve and resource categories answer different questions. Reserves are the portion demonstrated to be economically mineable under stated conditions and modifying factors. Resources represent geological material with reasonable prospects for eventual economic extraction, but they may not yet have the engineering, economic or permitting support needed for a reserve.
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U.S. Gold’s 2026 SEC-filed technical report states: Mineral Resources that are not Mineral Reserves have not demonstrated economic viability.
The same report cautions that there is no certainty that all or any part of a resource will convert to reserves. Treat that as a central due-diligence rule, not a footnote.
Read every category separately
| Category to record | What it can tell you | What it cannot prove |
|---|---|---|
| Proven and probable reserves | Material supported by the reserve study and its economic and modifying assumptions. | That the project will be built on schedule, stay within budget, or earn a target return. |
| Measured and indicated resources | Higher-confidence geological estimates that may support further engineering. | That the material is economic or will become a reserve. |
| Inferred resources | Lower-confidence geological information useful for exploration planning. | That tonnage, grade, recoveries or economics will survive additional drilling. |
Also note the effective date, qualified-person or competent-person basis, commodity prices, and whether resources are reported inclusive or exclusive of reserves. Adding reserve and resource ounces without knowing that relationship can double-count the same material.
Inspect the assumptions behind every estimate
A reserve or resource number is an output of a model. The model changes when prices, exchange rates, mining and processing costs, metallurgical recoveries, royalties, cut-off grades, strip ratios, mine designs, payability and permitting conditions change.
Commodity-price assumptions
U.S. Gold’s 2026 technical report selected reporting prices of $3,000 per ounce for gold, $4.40 per pound for copper and $35 per ounce for silver when estimating resources. It compared those with reserve assumptions of $2,100 per ounce for gold and $4.10 per pound for copper. These are report assumptions, not spot prices or forecasts. A higher assumed price can place more material inside an economic pit; a lower price can remove it.
Recovery and metallurgy
Recovery is the percentage of contained metal that the process is expected to extract. In the same U.S. Gold report, copper recovery is listed as 22% in the oxide domain, 75% in the mixed domain and 90% in the sulfide domain. Those project-specific estimates illustrate why two deposits with identical grades may have very different payable production. Look for separate domains, test-work results, concentrate quality, treatment and refining charges, and payability terms. Do not apply one mine’s recovery to another.
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Cut-off grade and mine design
Cut-off grade determines which material is considered economic under the stated assumptions. Ask whether the estimate uses open-pit or underground mining, what strip ratio is assumed, how dilution and mining recovery are handled, and whether infrastructure or permitting constraints limit the schedule. A resource reported at a low cut-off grade may contain more tonnes but less economic resilience if costs rise.
Compare gold and copper costs on matching bases
Gold costs are commonly quoted per ounce and copper costs per pound. The raw numbers are not comparable across metals. Even within one metal, production versus sales, attributable versus consolidated ownership, by-product credits, treatment and refining costs, royalties and sustaining capital can change the result.
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Cash cost generally reflects direct operating costs after specified credits, while AISC is intended to include sustaining capital and other sustaining items. Neither label guarantees a uniform calculation. OceanaGold says in its Q2 2026 SEC-filed results that “Cash Costs are a common financial performance measure in the gold mining industry; however, it has no standard meaning under IFRS.” Barrick identifies copper C1 cash cost and copper AISC as non-GAAP measures and lists the components included in its copper AISC.
Read the issuer’s definition and reconciliation to IFRS or GAAP before comparing companies. Confirm the period, metal, unit, production or sales denominator, ownership basis, by-product credits and the treatment of sustaining capital.
Examples of reported figures—and why they are not a ranking
| Issuer and period | Metric | Reported figure | Comparison caution |
|---|---|---|---|
| OceanaGold Corporation, three months ended June 30, 2026 | Gold AISC | $2,151 per ounce | Issuer-defined gold AISC for that quarter; compare only with gold AISC calculated on a matching basis. |
| OceanaGold Corporation, three months ended June 30, 2026 | Gold cash cost | $1,362 per ounce | Cash cost has no standard meaning under IFRS; inspect the reconciliation. |
| Barrick Mining Corporation, three months ended June 30, 2026 | Copper AISC | $3.95 per pound | Non-GAAP copper measure; verify included items and attributable basis. |
| Barrick Mining Corporation, three months ended June 30, 2026 | Copper C1 cash cost | $2.47 per pound | C1 is a specific issuer-defined measure, not interchangeable with another company’s cash cost. |
These figures are quarterly snapshots from different issuers’ disclosures, not a peer ranking or forecast. AISC can rise temporarily because of lower grades, planned maintenance, inflation or a higher sustaining-capital quarter. Review a multi-quarter and annual history where available.
Evaluate capital intensity and financing risk
Separate the money required to keep an operating mine running from money required to expand or build a project.
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Sustaining capital
Sustaining capital maintains existing production: replacement equipment, tailings work, underground development, plant maintenance and similar items. It belongs in the recurring cost of operating an established mine, although the exact AISC treatment is issuer-specific.
Growth and project capital
Growth capital funds expansions, new processing circuits, infrastructure and mine construction. A developer’s headline project value is only useful alongside the initial capital, construction contingency, schedule, ramp-up assumptions and funding source. Check whether the company has cash, debt capacity, project finance, partner funding or a likely need for equity issuance.
Balance-sheet checks
- Read the latest balance sheet for cash, restricted cash, debt maturities, lease obligations and available credit.
- Compare expected quarterly or annual development spending with liquidity and operating cash flow.
- Identify covenants, hedging, streaming or royalty agreements that may limit exposure to higher metal prices.
- Consider dilution if the plan depends on repeated share issuance; use current filings rather than an old presentation.
Match the evidence to the development stage
| Stage | Most useful evidence | Questions to ask |
|---|---|---|
| Producing mine | Reported production and sales, realized prices, cash cost, AISC, sustaining capital, recovery and operating cash flow. | Is performance meeting guidance? Are costs rising? Are grades, recoveries and availability stable? |
| Construction or advanced development | Feasibility study, permits, engineering progress, contracts, financing and updated capital estimate. | What approvals remain? Is funding committed? What could delay first production or increase capital? |
| Early development | Resource statement, metallurgy, economic study, infrastructure and exploration results. | How much drilling, test work and permitting is needed before a reserve can be declared? |
| Exploration | Drill results, geological model, land position and budget. | Is there continuity and scale, or only isolated high-grade intercepts? |
Do not compare an explorer’s contained-metal headline with a producer’s revenue or free cash flow. The figures describe different stages of risk and evidence.
Assess execution, jurisdiction and environmental exposure
Technical economics can fail through execution. Read the issuer’s risk factors and technical report for:
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- Permitting: outstanding environmental, water, land-use and operating approvals; appeal or litigation risk; and the schedule’s dependence on each approval.
- Infrastructure: roads, power, water, ports, concentrate transport and communications, including whether the project must build them.
- Labor and community relations: workforce availability, agreements, local benefits, consultation and the possibility of strikes or blockades.
- Construction and ramp-up: contractor performance, long-lead equipment, commissioning tests, design changes and the gap between nameplate and expected first-year output.
- Environmental and closure obligations: tailings design, reclamation bonds, water treatment, closure costs and post-closure monitoring.
- Commodity and currency exposure: whether revenue and costs are in different currencies, and whether hedging reduces upside as well as downside.
There is no universal risk score that makes these factors comparable. Use current company filings and the project’s latest technical report, then state the specific uncertainty instead of assigning an unsupported ranking.
A repeatable step-by-step comparison workflow
- Define the exposure. Record the primary metal, producing assets, development projects, ownership shares and whether revenue is diversified by mine or jurisdiction.
- Collect the latest filings. Start with the annual report, most recent quarterly results, current reserve/resource statement, technical report and management guidance. Write down each document’s publication date.
- Build the reserve/resource ledger. For every project, record proven, probable, measured, indicated and inferred tonnes, grade and contained metal; effective date; reporting standard; and whether resources include or exclude reserves.
- Read the notes before the headline. Capture assumed metal prices, exchange rates, recoveries by domain, costs, royalties, cut-off grade, strip ratio, dilution, mining method and payability.
- Normalize operating metrics. Compare gold with gold per ounce or copper with copper per pound; use the same quarter or year, sales versus production denominator, attributable ownership and definition. Save the non-GAAP reconciliation.
- Separate capital categories. List sustaining, expansion and initial project capital separately. Add cash, debt, liquidity, committed financing and expected spending from current financial statements.
- Test execution. Note permits, infrastructure, construction progress, labor and community issues, environmental obligations and closure requirements.
- Run sensitivities. Ask what happens if metal prices, recovery, grade, costs, exchange rates, schedule or capital change. Use published sensitivities where available; do not turn a single base case into a forecast.
- Write a balanced conclusion. State what is demonstrated, what depends on assumptions, the next milestone, and the event that would invalidate the thesis.
Use a comparison sheet that preserves context
A spreadsheet is useful only if every cell carries its qualification. A practical layout is:
| Field | Entry format |
|---|---|
| Project and ownership | Asset name; company interest; attributable basis. |
| Stage | Producer, construction, development or exploration; latest milestone date. |
| Reserves | Proven/probable tonnes, grade and contained metal; effective date; study basis. |
| Resources | Measured/indicated/inferred figures; inclusive or exclusive of reserves; effective date. |
| Assumptions | Gold/copper prices, recovery, cost, royalty, cut-off grade and mining method. |
| Operating cost | Cash cost, C1 or AISC; metal and unit; quarter/year; sales or production denominator; reconciliation. |
| Capital and liquidity | Sustaining and growth capital; cash; debt; committed funding; expected financing need. |
| Risks and catalysts | Permits, construction, exploration, guidance updates, debt maturities and closure obligations. |
If a company does not state a comparable value, enter “not stated” and cite the filing and date in your notes. Do not fill gaps with estimates from a different project or provider.
Common comparison mistakes and how to correct them
Using contained metal as a valuation shortcut
Problem: Multiplying resource ounces or pounds by a spot price ignores recovery, mining losses, costs, capital, royalties, taxes, time and the chance that material never becomes a reserve.
Correction: Start with reserve category, study assumptions and project stage; treat resources as geological potential.
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Problem: A low figure may reflect by-product credits, favorable grades, a different denominator or excluded sustaining items.
Correction: Read the definition and reconciliation, then normalize metal, unit, period and ownership.
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Mixing quarterly snapshots with annual figures
Problem: A maintenance quarter or temporary price movement can distort a comparison.
Correction: Compare like periods and inspect the trend, guidance and explanations for unusual movements.
Ignoring financing and dilution
Problem: A technically attractive project can require capital the company cannot fund without expensive debt or new shares.
Correction: Tie the construction schedule to liquidity, debt capacity and committed funding.
Repeating stale assumptions
Problem: Reserve prices, costs, guidance and technical estimates have effective dates and can become outdated.
Correction: Refresh annual and quarterly filings, guidance and technical reports before making or revisiting a decision.
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How to reach an investment conclusion without overstating certainty
Organize the conclusion around evidence rather than a target price. A stronger project case usually has a reserve supported by a current study, credible metallurgy, permits progressing on schedule, manageable capital and liquidity, and operating results that support guidance. A weaker case may depend on inferred resources, aggressive prices or recoveries, unresolved permitting, large unfunded capital or repeated schedule changes.
Write three explicit statements:
- Demonstrated: what current filings establish, such as reported production or a reserve under a stated study.
- Conditional: what must happen, such as converting resources, securing finance, receiving permits or achieving recoveries.
- Disconfirming: which event would change the view, such as a material reserve reduction, cost overrun, failed metallurgy, permit denial or liquidity shortfall.
This approach keeps a large resource, a low reported cost or management guidance from being mistaken for a guaranteed return. It is due-diligence structure, not individualized investment advice.
Keep the analysis current
The cited cost examples are for the three months ended June 30, 2026, and the U.S. Gold assumptions come from a 2026 technical report. Before relying on any comparison, replace those snapshots with each company’s latest annual and quarterly filings, guidance, reserve/resource statement and technical report. Preserve the reporting period, units, ownership basis, effective date and issuer definition every time you update the sheet.
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