How to Read a NI 43-101 Technical Report (Plain-English Checklist)

Summary box

• Start with the summary, resource estimate, and economics sections.


• Verify assumptions: commodity prices, recoveries, cut-off grade, and capex.


• Check the effective date and Qualified Person credentials.


• Compare multiple reports using consistent assumptions and stage.

Use this checklist to stay consistent across reports.

Last updated: 2026-02-01

If you are learning how to read a NI 43-101 technical report, the goal is to extract decision-grade information without getting lost in geology. These reports are dense, but they follow a consistent format, and the most important investor inputs are concentrated in a few sections. Use Mining Terminal's filings to access the latest reports, then cross-check project stages in projects.

This guide focuses on the sections that drive valuation, risk, and timeline. If you need a deeper background on resource terminology, read mining reserves vs resources explained first.

What is NI 43-101 and why it matters

NI 43-101 is the Canadian disclosure standard for mineral projects. It requires companies listed in Canada to follow defined reporting rules and have technical reports signed by a Qualified Person. The goal is to standardize resource and reserve disclosure and reduce misleading promotion.

When screening stocks, a NI 43-101 report is the most reliable source for project-level data because it includes resource estimates, study assumptions, and risk disclosures. It also provides a framework for comparing projects across the TSX and TSXV.

NI 43-101 does not guarantee a project will succeed, but it does require a level of disclosure that makes side-by-side analysis possible. This is why investors often use NI 43-101 reports as the baseline for building watchlists and screening early-stage companies.

How a NI 43-101 technical report is structured

Most reports follow the Form 43-101F1 format. You do not need to read every section in full, but you should know where key inputs live.

Typical sections include:

• Summary
• Introduction and terms of reference
• Reliance on other experts
• Property description and location
• Accessibility, climate, and infrastructure
• History
• Geological setting and mineralization
• Deposit type
• Exploration
• Drilling
• Sample preparation and QA/QC
• Data verification
• Mineral processing and metallurgical testing
• Mineral resource estimates
• Mineral reserve estimates (if applicable)
• Mining methods
• Recovery methods
• Project infrastructure
• Market studies and contracts
• Environmental studies, permitting, and social considerations
• Capital and operating costs
• Economic analysis
• Adjacent properties
• Other relevant data
• Interpretations and conclusions
• Recommendations
• References

Use the reading NI 43-101 reports guide to cross-check the most common sections if you are new to the format.

Study stages and what to expect

Not all NI 43-101 reports carry the same weight. The study stage determines how reliable the economics are and how far the project is from construction. If you only read one part of a report, make sure you know the study stage first.

Common study stages include:

• PEA (Preliminary Economic Assessment): Early-stage economics with higher uncertainty. PEAs can include inferred resources, so they are useful for scoping but not for financing.
• PFS (Pre-Feasibility Study): More detailed engineering and cost work. PFS results are more credible but still subject to change.
• FS (Feasibility Study): The most detailed stage before construction. FS-level studies typically support reserve conversion and project financing.

The feasibility study stages guide explains how each stage differs in engineering detail and risk. If a company is promoting strong economics from a PEA, treat it as a directional signal rather than a bankable plan.

How to read a NI 43-101 technical report: fast read checklist

If time is limited, start with these sections and only expand if something looks unclear.

• Summary: High-level project description, headline resource, and study outcomes.
• Mineral resource estimate: Category breakdown, assumptions, and cut-off grade.
• Economic analysis: NPV, IRR, payback, and sensitivity tables.
• Capital and operating costs: Initial capex, sustaining capital, and unit costs.
• Environmental and permitting: Status, required approvals, and timelines.

If a project does not have reserves, the resource and economic analysis sections become even more important because they define whether a reserve conversion is realistic.

When you finish the fast read, note any missing disclosures. Gaps usually indicate either early-stage work or a need for additional drilling and test work, both of which affect timeline and funding risk.

Section-by-section investor guide

1) Summary and conclusions

The summary should tell you the project stage, resource size, and the main economic case. Compare the summary with the detailed tables later to ensure the headline numbers are consistent. If the summary glosses over important risks, treat that as a warning sign.

2) Property description, location, and access

This section provides jurisdiction context. Infrastructure access, power, water, and logistics can make or break project economics. Use the mining jurisdiction checklist to evaluate risk if the project is in a challenging area.

3) Geological setting and deposit type

Deposit type matters for cost, recovery, and continuity. A sediment-hosted copper deposit behaves differently from a high-grade vein. Understanding deposit type helps you judge whether drilling density and metallurgical testing are appropriate.

4) Exploration and drilling

This section explains the drilling density, intercept quality, and continuity assumptions. Use the how to evaluate drill results guide if you want to sanity-check grade, width, and continuity claims.

5) Sample preparation and QA/QC

Look for the use of blanks, standards, and duplicates. QA/QC is the quality control system that validates assays. If the report lacks QA/QC detail, it is difficult to trust the resource estimate.

6) Data verification

Data verification indicates whether the Qualified Person checked historical data and validated the database. When data is inherited from older campaigns, this section is critical.

7) Qualified Person and effective date

Every NI 43-101 report is signed by a Qualified Person. This person is accountable for the technical content. Check whether the QP is independent or affiliated with the company, and note their relevant experience. A QP with direct experience in the deposit type and mining method adds credibility.

Also verify the effective date. Older reports can be stale, especially after new drilling, changes in commodity prices, or major permitting events.

7) Mineral resource estimate

This is the core of the report. Focus on:

• Category breakdown (inferred, indicated, measured).
• Cut-off grade assumptions.
• Density factors and recovery assumptions.
• Sensitivity to commodity prices.

If you do not already understand the categories, refer to mining reserves vs resources explained.

8) Mineral reserve estimate (if present)

If reserves are reported, check the mining method, processing assumptions, and economic criteria that drove the conversion. Reserves are not simply resources plus time. They require evidence that the project can be mined profitably.

9) Mining methods

The report should justify why the project is open pit, underground, or a combination. Review the mining method assumptions using underground vs open pit mining and the strip ratio explained guide.

10) Mineral processing and metallurgical testing

Metallurgy is often the hidden risk. Look for:

• Test work coverage across ore types.
• Recovery assumptions and variability.
• Reagent and power requirements.

The metallurgical recovery explained guide provides context.

11) Infrastructure

Projects that lack power, water, or roads often face higher capex. Check whether the report assumes new infrastructure and whether timelines are realistic.

11a) Market studies and off-take

Some reports include market studies or preliminary off-take discussions, especially for specialty metals. This section helps you understand whether there is a realistic buyer base and whether pricing assumptions match industry practice.

If a project depends on a narrow set of buyers or a complex refining route, the market study section becomes critical. Look for clarity on product specification, transportation requirements, and potential bottlenecks.

12) Capital and operating costs

This section is central to valuation. Compare unit costs with peers using the AISC explained guide. Also check whether the cost model includes inflation or relies on outdated inputs.

13) Economic analysis

The economic analysis is where the project stands or falls. Look for:

• Commodity price assumptions.
• Discount rate and taxation.
• Sensitivity tables and stress tests.

If small changes in price or recovery cause the project to turn negative, treat the economics as fragile.

13a) Sensitivity tables and scenario testing

Sensitivity tables show how project value changes when key assumptions move. Pay attention to price, recovery, capex, and operating cost sensitivity. A project that only works under a narrow price range is higher risk, even if the base case looks strong.

Scenario testing also reveals which inputs matter most. If capex sensitivity is extreme, funding risk becomes a critical factor. If operating cost sensitivity is high, the project may be more exposed to inflation or logistics issues.

Related reading: mining portfolio construction, build a mining stocks watchlist, mining stock catalysts, and mining feasibility study checklist. Additional context: mining stocks overview, and mining stocks list.

14) Environmental, permitting, and social considerations

Permits and social license can drive delays or cost overruns. Review the mining permitting timeline guide and mining project risk checklist for context.

14a) Adjacent properties and regional context

Reports often include a section on adjacent properties. This is not a valuation driver by itself, but it can help you understand regional geology, infrastructure, and discovery potential. Treat nearby success as context, not proof of value for the subject project.

If the report relies heavily on comparisons to nearby mines, make sure the geology and deposit type are truly comparable. Overstated analogs are a common marketing shortcut.

Key assumptions to verify

When you learn how to read a NI 43-101 technical report, the biggest mistakes come from ignoring the assumptions. Check these items before you accept the economic case:

• Commodity price deck: Are prices conservative or aggressive?
• Recoveries: Are they supported by test work and realistic for the ore type?
• Cut-off grade: Is it consistent with mining method and costs?
• Dilution and mining losses: Are they reasonable for the deposit type?
• Capital costs: Are they realistic given location and infrastructure needs?
• Sustaining capital: Is ongoing spend included?
• Schedule: Are the timelines credible for permitting and development?

Review the mining stock valuation methods guide and compare with comparable analysis.

If these assumptions look aggressive, the valuation and reserve conversion are fragile.

Capital structure and funding risk

Technical reports often separate initial capital, sustaining capital, and closure costs. Investors should not focus only on the initial capex. Sustaining capital can materially affect free cash flow, especially in projects with high strip ratios or short mine lives.

If the report assumes project finance or streaming funding, review the terms and timing assumptions. A technically strong project can still be delayed by funding gaps or unfavorable financing terms.

How to turn a report into a quick model

Investors do not need a full mine model to make decisions, but a simple framework can help you compare projects. Use the report to capture a small set of inputs:

• Production profile and mine life.
• Head grade and recovery assumptions.
• Operating cost per unit.
• Initial and sustaining capital.
• Royalty and tax assumptions.

With these inputs, you can build a rough margin and payback view. This helps you spot projects that look attractive on headline metrics but weak on cash flow. Use the mining stock valuation methods guide to connect these inputs to valuation multiples.

How to read tables and footnotes

Many of the most important details live in tables and footnotes. Resource and reserve tables often include cut-off grades, density assumptions, and category definitions in the footnotes. Economic tables may include different price decks or alternative cases.

When you read a table, scan the footnotes before you compare projects. Two tables can look similar but use different assumptions. If a table does not disclose the key assumptions, treat the numbers as incomplete.

Questions to ask management after reading the report

Technical reports are static, but projects evolve. After reading a report, investor questions should focus on what can change the economics:

• What assumptions are most sensitive to price and recovery?
• Which permits are on the critical path?
• What additional drilling is required to upgrade inferred resources?
• Are there alternative mining methods under consideration?
• How does the company plan to finance construction if the project advances?

These questions help you interpret whether the report is a baseline or an evolving plan.

Recommendations and work programs

Most reports include a recommendations section that outlines the next phase of work and an estimated budget. This section helps you understand what must be completed before the project can move to the next stage.

If the recommendations include major drilling, metallurgical testing, or permitting work, the project is still in an early phase. If the recommendations focus on detailed engineering, the project may be closer to construction. Compare the recommendations with the company's financing plan to judge whether the timeline is realistic.

Related reading: mine life and reserve life index.

How to compare two technical reports

To compare projects, standardize the inputs:

• Align the commodity price assumptions.
• Compare the same project stage (PEA vs PFS vs FS). See feasibility study stages.
• Normalize for mining method and recovery assumptions.
• Use consistent discount rates.
• Check the effective date for data freshness.

This approach keeps your comparison from being distorted by timing or methodology differences.

NI 43-101 vs JORC and SEC S-K 1300

Most global mining companies follow one of three reporting codes: NI 43-101 (Canada), JORC (Australia), or SEC S-K 1300 (United States). The categories are similar, but the disclosure style can differ. JORC reports often place more emphasis on Competent Person statements, while SEC S-K 1300 uses a US-specific framework for resources and reserves.

When comparing a TSX company to an ASX or NYSE peer, confirm the reporting code and make sure the categories are equivalent. The mining reserves vs resources explained guide provides a quick reference.

Historical estimates and data gaps

Some reports reference historical estimates that do not meet current reporting standards. These estimates can provide context but should not be used as current resources or reserves. If a report highlights historical data, look for a clear plan to validate or replace it.

Data gaps can also appear when drilling is limited or when data is inherited from previous operators. In these cases, treat the resource estimate as provisional until new verification work is completed.

Red flags investors should watch

A strong report can still hide weak economics. Common red flags include:

• Old effective dates with no updates.
• Resource estimates dominated by inferred material.
• Metallurgical assumptions without test work.
• Permitting assumptions that appear optimistic.
• Cost estimates that are materially below peers without explanation.

When you see a red flag, verify the assumptions against peer projects in stocks or projects.

Using Mining Terminal to speed up your review

Mining Terminal can help you turn long reports into actionable insights:

• Use filings to find the latest technical reports by company.
• Cross-check project stages and commodities in projects.
• Compare company valuation in stocks.
• Link to related guidance like mining stock valuation methods or how to evaluate drill results.

This workflow helps you focus on the few decisions that matter most.

Common misconceptions to avoid

• A large resource does not mean a bankable project.
• A strong base case does not guarantee financing.
• High grades do not offset poor recovery or infrastructure gaps.
• A single report snapshot is not a trend; check for updates over time.

Use the mining stocks catalysts calendar to track when updates are likely to arrive.

How to interpret sensitivity tables

Sensitivity tables show how project economics change when prices, costs, or recoveries move. Investors should focus on the downside cases because they reveal how resilient the project is in weak markets. If a small price decrease erases most of the NPV, the project is highly leveraged to commodity prices.

Check whether the sensitivity table uses realistic ranges. A report that only shows plus or minus 10 percent may understate risk if the commodity is volatile. Also confirm that the sensitivity applies to both prices and costs. Many projects suffer when prices fall and costs rise at the same time.

Use commodity cycles guide to align sensitivity assumptions with cycle risk.

Quick checklist

| Step | What to check | Why it matters |
| --- | --- | --- |
| Read summary | Stage and headline metrics | Ensures the project is comparable |
| Check resource table | Categories and cut-off | Confidence and economics |
| Review mining method | Open pit vs underground | Cost structure and risk |
| Scan metallurgy | Recovery assumptions | Profitability sensitivity |
| Inspect costs | Capex and opex realism | Funding risk and margins |
| Review economics | NPV, IRR, sensitivity | Robustness to price changes |
| Verify permitting | Approvals and timelines | Schedule and execution risk |

Frequently Asked Questions

Is a NI 43-101 report audited?
It is signed by a Qualified Person, but it is not a financial audit.

How often are NI 43-101 reports updated?
Typically after material changes such as new resources, a new study stage, or a major project change.

Do all NI 43-101 reports include reserves?
No. Early-stage projects often have resources but no reserves.

What is the most important section for investors?
The resource estimate and economic analysis sections usually carry the most weight.

How do I compare NI 43-101 reports across commodities?
Use consistent price assumptions and compare the same study stage and mining method.

Sources

• NI 43-101 disclosure standard: https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/862011
• Form 43-101F1 technical report requirements: https://www.bclaws.gov.bc.ca/civix/document/id/complete/statreg/243812005
• CIM Definition Standards: https://mrmr.cim.org/media/1068/cimdefinitionstandards2014.pdf

Related reading: cut-off grade explained.

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Disclaimer: This analysis is provided for informational purposes only and does not constitute investment advice. Mining Terminal is not a registered investment advisor. Mining stocks carry significant risks including commodity price volatility, operational challenges, and regulatory changes. Always conduct your own research and consult with a qualified financial advisor before making investment decisions. Data sourced from company filings and may not reflect the most recent developments.