The JORC Code sets the standard for how Australian mining companies report exploration results, mineral resources, and ore reserves to the market.
Context and background
Public reporting plays a central role in the mining industry. Exploration companies regularly release drilling results, resource estimates, and development studies that influence investment decisions and market sentiment.
To ensure this information is reliable and comparable, Australia uses a formal reporting framework known as the JORC Code. The Code establishes rules that govern how mining companies disclose technical information to investors.
Understanding how JORC reporting works helps investors interpret company announcements and assess the credibility of exploration and development claims.
What the JORC Code is
The JORC Code is a professional reporting standard used by mining companies listed on the Australian Securities Exchange.
The Code is maintained by the Joint Ore Reserves Committee, which represents several industry organisations including the Australasian Institute of Mining and Metallurgy and the Australian Institute of Geoscientists.
The JORC Code sets minimum standards for the public reporting of:
- Exploration results
- Mineral resources
- Ore reserves
Its purpose is to ensure that information released to the market is accurate, balanced, and supported by appropriate technical expertise.
Why the JORC Code exists
Mining projects involve complex geological and technical information that can be difficult for non-specialists to interpret. Without clear standards, companies could present data selectively or inconsistently.
The JORC Code addresses this risk by requiring transparency and accountability in public reporting.
The Code is based on three key principles:
- Transparency — meaning information must be clear and not misleading
- Materiality — meaning companies must disclose information that could influence investment decisions
- Competence — meaning qualified professionals must take responsibility for technical statements
These principles help maintain confidence in the integrity of mining disclosures.
The role of the competent person
A central feature of JORC reporting is the competent person.
A competent person is a qualified geologist or mining engineer with relevant experience in the type of deposit and activity being reported. This individual must review and approve the technical information before it is released publicly.
Competent persons take professional responsibility for the accuracy and completeness of reported data. Their name and professional affiliation must appear in the announcement.
This requirement ensures that technical statements are backed by recognised expertise rather than promotional claims.
Reporting exploration results
Exploration announcements often represent the earliest stage of JORC reporting.
When companies report drilling results or sampling data, they must disclose enough information for readers to understand how the results were obtained. This includes details such as sampling methods, drilling techniques, and laboratory procedures.
Companies must also include tables summarising key technical parameters. These tables help ensure transparency and allow investors to evaluate the reliability of the reported data.
JORC reporting discourages selective presentation of results. If drilling produces mixed outcomes, companies must present information in a balanced way.
Reporting mineral resources and ore reserves
The JORC Code also governs how mineral resources and ore reserves are reported.
Resource estimates must be classified into the recognised categories of inferred, indicated, and measured, reflecting different levels of geological confidence.
Ore reserves must be reported as probable or proved reserves and supported by appropriate economic and technical studies.
JORC reporting requires companies to explain the assumptions behind these estimates, including geological interpretation, data quality, and economic considerations.
This framework helps investors distinguish between early-stage exploration potential and projects that have progressed towards development.
Table 1 disclosures
JORC-compliant announcements typically include a section known as Table 1.
Table 1 provides detailed technical information about exploration programs or resource estimation methods. The goal is to ensure that important technical details are disclosed in a consistent format.
Information commonly included in Table 1 may cover:
- Sampling techniques and procedures
- Data quality and verification methods
- Geological interpretation
- Drilling methods and spacing
While Table 1 can appear highly technical, it plays an important role in maintaining transparency and allowing specialists to review the reliability of reported results.
How investors should read JORC announcements
JORC reporting provides a framework, but interpretation still requires context.
Investors often focus on headline figures such as drill intercepts or resource sizes. However, supporting details may be equally important.
Key aspects to consider include:
- The classification of the resource or reserve
- The density and distribution of drilling data
- Assumptions used in economic assessments
- Whether results represent isolated intersections or consistent trends
Understanding these factors helps place announcements in perspective and reduces the risk of misinterpreting early-stage results.
Canada’s NI 43-101 standard
Canada uses a comparable reporting framework known as National Instrument 43-101.
NI 43-101 establishes disclosure rules for mineral projects listed on Canadian exchanges. Like the JORC Code, it requires technical information to be prepared or supervised by qualified professionals.
The standard was introduced to improve transparency after several historical cases of misleading disclosure in the mining sector.
While terminology and documentation requirements differ slightly, the underlying goals of NI 43-101 and the JORC Code are similar. Both frameworks aim to protect investors by ensuring consistent and reliable reporting of technical information.
Why it matters
JORC reporting underpins confidence in Australia’s mining sector.
For investors, understanding the framework helps explain:
- Why announcements include technical tables and disclaimers
- Why competent persons sign off on results
- Why resource and reserve classifications follow strict categories
The Code does not eliminate uncertainty, but it provides a structured approach to reporting geological and technical information.
Conclusion
The JORC Code sets the standards for how Australian mining companies report exploration results, mineral resources, and ore reserves. By requiring transparency, materiality, and professional oversight, it helps ensure that technical information released to the market is credible and consistent.
Understanding how JORC reporting works provides essential context for interpreting mining announcements and assessing the progress of exploration and development projects.
Images: Flickr & Wikimedia Commons
This resource is made possible through our collaboration with MDF Global, reflecting its ongoing commitment to elevating the standard of discourse within the Australian resources sector. Together, we are providing the specialised knowledge necessary for the next generation of industry leaders and investors to identify value in an increasingly complex global landscape.
