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June 10, 2026NI 43-101 is the Canadian regulatory framework that governs how mining companies publicly disclose scientific and technical information about mineral projects. Understanding its core concepts — resource classifications, economic assessments, and qualified person requirements — helps investors and analysts read disclosure documents accurately without mistaking them for investment signals.
What is NI 43-101?
National Instrument 43-101 — Standards of Disclosure for Mineral Projects — is a rule administered by the Canadian Securities Administrators (CSA) that sets minimum requirements for how issuers listed on Canadian exchanges must publicly disclose scientific and technical information about mineral properties. It was introduced in 2001 following high-profile fraudulent resource claims and applies to all mineral disclosure made by reporting issuers, including press releases, investor presentations, and formal technical reports. The standard is designed to ensure consistency and transparency in disclosure, not to indicate whether a project is commercially viable. Compliance is mandatory; it is a disclosure rule, not an endorsement of a project’s economic merit.
What is a mineral resource estimate?
A mineral resource estimate is a volumetric and grade calculation of mineralization that has reasonable prospects for eventual economic extraction, based on geological evidence and sampling data. It represents the Qualified Person’s best technical interpretation of the available data at a specific point in time, and it can change materially as new drilling or analysis is completed. Resource estimates follow definitions set out in the CIM Definition Standards on Mineral Resources and Mineral Reserves, which are incorporated by reference into NI 43-101. A resource estimate is a geological and technical statement; it is explicitly not a statement about economic or financial outcomes, and it should not be read as one.
What is the difference between Inferred, Indicated, and Measured Resources?
The three resource categories reflect increasing levels of geological confidence based on the density and reliability of sampling data. An Inferred Resource has the lowest confidence — sufficient geological evidence to imply continuity of mineralization but insufficient data to verify grade or tonnage with high certainty. An Indicated Resource has enough sampling density to assume geological and grade continuity with reasonable confidence, allowing quantity, grade, and physical characteristics to be estimated. A Measured Resource carries the highest confidence level, supported by closely-spaced sampling that confirms continuity of grade and quality to the point where detailed mine planning can reasonably rely on it. These distinctions are defined by the CIM Definition Standards and directly govern what economic studies a resource category may be used in.
Why are mineral resources not the same as mineral reserves?
Mineral reserves are a subset of resources that have passed a higher bar: they must be demonstrated to be economically extractable under assumed conditions, typically through a Pre-Feasibility or Feasibility Study that includes mining, metallurgical, infrastructure, and financial modelling. Resources, by contrast, have only “reasonable prospects” for eventual economic extraction — a much lower threshold. Converting a resource to a reserve requires additional engineering work, environmental permitting progress, and economic analysis, all of which can alter the tonnage and grade significantly. Many projects with published resource estimates never reach the reserve stage, which is one reason the distinction matters to anyone reading disclosure documents. The CIM Definition Standards formalize these categories, and NI 43-101 requires issuers to use them consistently.
What is a Preliminary Economic Assessment (PEA)?
A Preliminary Economic Assessment is an early-stage study that provides a high-level economic evaluation of a mineral project using mineral resources that may include Inferred Resources. Because it can incorporate the lowest-confidence resource category, NI 43-101 requires companies to include a prominent caution that a PEA is preliminary in nature, that it includes Inferred Resources that are considered too speculative geologically to be used in economic analysis under reserve categorization, and that there is no certainty results will be realized. A PEA is used to evaluate whether a project warrants further expenditure and to outline potential mining scenarios. It is explicitly a scoping-level document with wide uncertainty ranges, and the CSA has consistently emphasized that PEA results must not be interpreted as economic forecasts or guarantees of project development.
What are a Pre-Feasibility Study and a Feasibility Study, and how do they differ?
A Pre-Feasibility Study (PFS) is an intermediate-level engineering study that evaluates the technical and economic viability of a project in sufficient detail to support conversion of Indicated and Measured Resources into Probable and Proven Reserves respectively. It uses more rigorous cost estimates and engineering design than a PEA but is not yet the definitive study for a construction decision. A Feasibility Study (FS) — sometimes called a Definitive Feasibility Study — is the highest level of study under NI 43-101 and is typically required before a company proceeds to project financing and construction; it involves detailed engineering, metallurgical testing, and tighter capital and operating cost estimates. Both documents must be prepared by or under the supervision of a Qualified Person. The progression from PEA to PFS to FS represents increasing technical confidence and expenditure, not a guarantee of project success. Readers comparing Canadian mining companies can review technical report summaries filed on SEDAR+ and explore additional context in the Boersenpost knowledge base.
What is the role of the Qualified Person under NI 43-101?
The Qualified Person (QP) is an engineer or geoscientist with at least five years of relevant experience in the type of mineralization or activity being reported, who is in good standing with a recognized professional association. The QP must review and take responsibility for the technical content of all NI 43-101 disclosures, including press releases and technical reports, by certifying accuracy and signing the document. This accountability mechanism is central to the standard: it assigns professional and legal responsibility to a named individual rather than allowing anonymous or unverified claims. Recognized professional associations include Engineers and Geoscientists Canada member bodies as well as several international bodies listed by the CSA; the QP requirement cannot be satisfied by a company’s management team unless they individually hold the required credentials.
Where are NI 43-101 technical reports filed, and how can they be accessed?
Technical reports required under NI 43-101 must be filed on SEDAR+ (the System for Electronic Document Analysis and Retrieval, successor to SEDAR), which is the official electronic filing system for Canadian public company disclosures administered under CSA oversight. Reports are publicly accessible at no cost through the SEDAR+ platform at sedarplus.ca, allowing any researcher or analyst to read the full document, including the QP certificates and data sections. Companies listed on the TSX, TSX Venture Exchange, or CSE are subject to these filing obligations, and TMX Group provides exchange-level listing standards that reference NI 43-101 compliance. For investors following Canadian small-cap mining companies from outside Canada — including readers approaching the sector through the Canada-Germany corridor — the Boersenpost company directory links to issuers whose technical reports can then be verified directly on SEDAR+. German-regulated disclosure obligations under BaFin and Deutsche Boerse rules apply separately if a company has a dual listing, but do not replace the Canadian NI 43-101 filing requirement.
Sources
Canadian Securities Administrators, National Instrument 43-101 Standards of Disclosure for Mineral Projects and Form 43-101F1, csa-acvm.ca; CIM Standing Committee on Reserve Definitions, CIM Definition Standards on Mineral Resources and Mineral Reserves (2014, updated 2019), miningstandards.ca; SEDAR+ Electronic Filing System for Canadian Public Company Disclosures, sedarplus.ca; TMX Group, TSX Company Manual — Section 4 (Mining and Oil and Gas), tmx.com; Canadian Institute of Mining, Metallurgy and Petroleum (CIM), Best Practice Guidelines for Resource and Reserve Estimation, miningstandards.ca; BaFin (Bundesanstalt für Finanzdienstleistungsaufsicht), Issuers and Prospectus Requirements, bafin.de; Deutsche Boerse Group, Listing Requirements and Transparency Standards, deutsche-boerse.com. Accessed 2026-06-10.
By Boersenpost · reviewed by Carsten Schmider, financial analyst — last updated 10 June 2026. Educational content, not investment advice.
