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Before investing, establish what the lithium project has actually demonstrated, what is still an assumption, and what could prevent it from advancing or reduce your return. The most important checks are stage and technical reports, resource classification, metallurgy, tenure and permits, economics, market access, and funding runway. An exploration prospect, a preliminary economic assessment and a feasibility-stage project represent materially different evidence and risks.
Start by identifying the project’s real development stage
Do not rely on a presentation label such as “advanced exploration” or “near development.” Ask for the latest dated work program and the complete technical study. Ontario’s mining sequence describes evaluation through mineral-resource reporting, a preliminary economic assessment (PEA), a pre-feasibility study (PFS) and a feasibility study (FS). The work covers geology, mining, processing, infrastructure, economics, pricing, financing and life-of-mine expenditure. A construction decision is expected only after the deposit is better defined and the economic work is sufficiently advanced.
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| Stage | Evidence you should expect | What it does not prove |
|---|---|---|
| Exploration | Claims or leases, geological mapping, sampling, drilling and assay results | A defined resource, economic mine or construction timetable |
| Mineral-resource reporting | A technical estimate classified as inferred, indicated or measured under an applicable reporting code | A reserve or a financeable mine plan |
| Preliminary economic assessment | Early mine, processing, infrastructure and economic scenarios based on stated assumptions | Feasibility-level costs, permits, financing or a construction decision |
| Pre-feasibility study | More developed engineering, mine scheduling, metallurgy, capital and operating estimates | Final approvals, funding or guaranteed project returns |
| Feasibility study | A detailed technical and economic case intended to support a development decision | Certainty that construction will be approved, financed or completed |
Management targets and study dates are not evidence that later-stage work is complete. Record the study title, author, effective date, reporting code and the work still required before construction.
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Obtain the complete technical report
Request the full current report rather than relying on a slide or a resource graphic. Identify the competent or qualified person, jurisdiction and reporting code, effective date, drilling density, sampling and assay methods, laboratory quality controls, geological model, cut-off grade and assumptions supporting “reasonable prospects” of eventual extraction. Check whether the estimate has changed from the prior report and why.
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Keep resources and reserves separate
A mineral resource is an estimate of potentially economic mineralisation. A mineral reserve requires additional modifying factors, including mine design, processing, infrastructure, legal rights, environmental and social conditions, economic analysis and other practical constraints. Inferred material is too speculative for those modifying factors to establish reserves. A project can therefore report a very large resource while having no reserve at all.
Use the McDermitt figures as a reading example, not a benchmark
The McDermitt Lithium Project S-K 1300 Initial Assessment, dated May 2026, reports 1,030 million tonnes of indicated resource at 1,450 parts per million lithium and 1,440 million tonnes of inferred resource at 1,320 parts per million, using a 1,000-parts-per-million cut-off. It reports no mineral reserves. The estimate relies on assumptions including lithium-carbonate price, costs and process recovery. These are project-specific figures and do not describe a typical lithium project.
| McDermitt reported category | Tonnage | Grade | Cut-off | Reserve status |
|---|---|---|---|---|
| Indicated resource | 1,030 Mt | 1,450 ppm lithium | 1,000 ppm lithium | No mineral reserves estimated in the report |
| Inferred resource | 1,440 Mt | 1,320 ppm lithium | 1,000 ppm lithium | Inferred material cannot establish reserves without sufficient modifying factors |
For any project, read the footnotes beside the resource number. A lower cut-off can increase reported tonnes while including lower-grade material; a higher cut-off can reduce tonnes but improve average grade. Neither choice, by itself, proves commercial viability.
Check whether the processing route can produce a saleable product
First identify the deposit type: hard-rock, brine, clay or another mineralisation style. A flowsheet that works for one type cannot be assumed to work for another. Ask for representative sample selection, testwork scale, recovery at each process step, reagent and energy consumption, impurity-removal performance, water balance, waste and tailings characteristics, and the final product specification.
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Separate measured performance from modeled assumptions
Look for pilot or demonstration results using samples that represent the planned mine, not only a high-grade or unusually clean laboratory sample. Confirm whether recovery is measured on a mass balance, modeled from limited tests or simply assumed in an economic model. Ask how recovery changes with grade, mineralogy, moisture and impurities.
Investigate impurity and lithium-loss risks
Complex mineralogy and specialized processing can create technical risk. The McDermitt report states that its assumed 2% lithium loss during impurity removal and carbonate production had not been verified by dedicated testwork; actual losses could be higher. A small-looking loss assumption can materially reduce payable production, raise waste volumes and weaken revenue. Require the testwork, calculation and sensitivity case behind every recovery and loss percentage.
Verify the product that buyers will accept
“Lithium” is not a single commercial product. Determine whether the proposed output is concentrate, carbonate, hydroxide or another intermediate, and obtain its expected purity, impurity limits, moisture, particle size and packaging requirements. A technically recoverable mineral is not automatically a product that a customer will qualify.
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Check tenure, permits, water and affected communities
Map the legal rights
Obtain a current map and legal schedule covering mineral claims or leases, surface rights, water rights, access roads, royalties, options, streams, easements and other encumbrances. Verify that the claim type and boundaries match the technical report. A gap between the map, registry and report can delay drilling or invalidate assumptions about access.
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Build a permit and appeal register
List every required federal, state, provincial and local approval, its applicant, submission date, decision maker, current status, expiry, appeal period and dependencies. Include exploration, construction, mine, water, discharge, waste, air, transport and processing approvals where applicable. The McDermitt report identifies ambiguity about claim type and coverage, numerous federal, state and local permits, anticipated opposition and two appeals against an exploration permit. Those are project risks, not administrative footnotes.
Price environmental and closure obligations
Review baseline studies, water supply and discharge, tailings or waste-rock plans, biodiversity impacts, rehabilitation standards, closure timing, financial assurance and post-closure monitoring. Ask whether closure cost is included in capital, operating, sustaining or separate liability estimates. Confirm who bears the obligation if the project changes owner or becomes insolvent.
Assess consultation and social licence
Identify local and Indigenous communities, consultation commitments, agreements, cultural-heritage issues, land-use conflicts and any litigation or appeals. Confirm which commitments are legally binding and which are voluntary. A permit can be technically obtainable yet delayed by unresolved consultation or opposition.
Rebuild the economic case from its assumptions
Read the complete economic section and classify it correctly. A PEA is an early scenario; it is not a feasibility-level forecast. Check the mine plan, strip ratio or brine-well assumptions where relevant, throughput, product grade, recovery, construction schedule, capital cost, operating cost, contingency, sustaining capital, taxes, royalties, closure cost, exchange rate, commodity-price basis and discount rate.
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Stress the variables that drive value
Ask for a sensitivity table or model showing the effect of lower lithium prices, lower recovery, higher capital and operating costs, construction delay, lower throughput, inflation, exchange-rate movement and higher financing costs. A headline net present value (NPV), internal rate of return (IRR) or payback period is meaningful only with the assumptions and downside cases that produced it.
Distinguish project economics from corporate solvency
Resources Victoria’s guidance states that “Economic viability is not a function of a firm’s financial capability.” A project may look economic on paper while its owner lacks cash to complete drilling, permitting or construction. Evaluate the deposit’s modeled economics separately from the company’s balance sheet, access to capital and ability to meet obligations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Confirm a route to market
Identify the intended buyer pool, product qualification process, transport route, price reference and likely payment terms. Read every memorandum of understanding, term sheet and offtake contract in full. Determine whether it is binding, conditional, exclusive, volume-limited or dependent on product qualification, permits, financing or a final investment decision.
Do not treat a non-binding announcement as secured revenue. Australia’s Critical Minerals Strategy 2023–2030 notes that concentrated supply chains, opaque markets and limited pricing data can make it difficult to secure offtake, equity and debt finance. Ask who bears specification failure, transport disruption, price adjustment and volume shortfall risk.
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Measure funding runway and dilution risk
Map cash and committed funding against the cost and schedule of the next milestone, not merely the next quarter. Identify equity raises, debt terms, strategic-partner obligations, grants, royalties, streams, warrants and minimum-spend commitments. Calculate how much capital is needed to reach the next independently verifiable result and what happens if a financing or study is delayed.
- Record cash on hand and committed funds separately.
- List the next technical, permitting and corporate milestones with their estimated cost and date.
- Check whether debt requires a feasibility study, reserve, offtake, security or hedging.
- Model potential dilution under plausible equity-raising prices and amounts.
- Identify funding conditions that could transfer control or impose mandatory spending.
Australia’s strategy describes junior proponents as facing large capital and energy requirements and difficulty securing equity, debt and offtake. A technically promising project can still fail to advance if financing arrives late or on punitive terms.
Compare projects only on a like-for-like basis
Use the same evidence framework for each candidate and compare exploration with exploration, PEA with PEA and feasibility with feasibility. Keep management targets separate from findings supported by an independent technical report.
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|---|---|
| Evidence maturity | What is the latest dated study, who prepared it, and what work remains? |
| Technical uncertainty | How reliable are geology, grade continuity, recovery, impurity removal and product specifications? |
| Permitting and social risk | Which approvals, appeals, land rights, water rights and consultation obligations remain? |
| Capital to next milestone | What cash is required before the next independently checkable result, and is it funded? |
| Market evidence | Is there a qualified buyer, a binding contract and a transparent pricing basis? |
| Funding runway | How long can the company operate, and what dilution or debt conditions are likely? |
Apply the rules of the host jurisdiction and your own transaction
Mining, environmental, water, consultation, tax and securities rules vary by country and subnational authority. The investment instrument and your residence can create additional obligations. Check the project’s current filings and the rules that apply to your account, fund, company or trust rather than relying on a general mining checklist.
Australia provides a useful jurisdiction-specific example. Guidance last updated 2 January 2026 says acquisitions of mining or production tenements generally require notification regardless of value, subject to exceptions. Foreign-government investor rules and securities acquisitions have separate tests. This Australian rule should not be generalized to projects elsewhere; obtain local legal and tax advice before committing funds.
A practical document-and-decision workflow
- Define the investment. Record the issuer, security, entry price, maximum loss you can tolerate, liquidity needs and intended holding period.
- Verify identity and rights. Match the issuer, project name, tenement numbers and ownership percentages across filings, registries and technical reports.
- Read the latest technical report. Note the reporting code, effective date, resource classification, cut-off grade, recovery assumptions and reserve status.
- Reconcile the flowsheet. Trace feed from mine to final product and mark every measured result, modeled step and unverified assumption.
- Audit approvals. Build the permit, appeal, land-access, water and consultation register, including expiry dates and financial-assurance requirements.
- Recalculate the economics. Reconcile production, price, recovery, capital, operating cost, taxes, royalties, closure and financing assumptions to the stated NPV and IRR.
- Validate the market. Classify each buyer document as binding or non-binding and list all qualification and financing conditions.
- Test funding survival. Compare cash and committed capital with the cost of the next milestone and model dilution if a raise is required.
- Write a failure case. State which single issue—metallurgy, permit, water, price, financing or social opposition—would make you stop or reduce the investment.
Red flags that deserve a pause
- A resource number without a complete report, effective date, classification or cut-off grade.
- Reserve language used when no reserve has been reported.
- Recovery, impurity removal or lithium-loss percentages described as assumptions but presented as test results.
- A flowsheet that changes between technical documents without an explanation of cost and schedule effects.
- Tenement maps that do not reconcile with legal descriptions or unresolved ownership and access issues.
- Permits described as “in process” without applications, agencies, appeal status or decision dates.
- NPV or IRR shown without price, discount rate, capital, operating cost and sensitivity assumptions.
- An offtake announcement that is non-binding or conditional on future qualification and financing.
- A cash balance that cannot fund the next milestone without a likely equity raise.
- Management timelines treated as completed studies or approvals.
What a defensible investment file should contain
Keep the latest technical report, resource tables, assay and quality-control discussion, metallurgical testwork, mine and process diagrams, permit register, tenure documents, environmental and consultation records, economic model assumptions, buyer agreements, capital structure and cash forecast. Date each document and record what changed from the previous version. This creates an audit trail for deciding whether new evidence reduces risk or merely changes the presentation.
An early-stage lithium investment is justified only when the evidence, uncertainty and financing need fit your risk capacity. Treat every unverified recovery, approval, market commitment and management target as a condition to be resolved—not as value already delivered.
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