Exxaro continuously strives to enhance the level of estimation and reporting of our Mineral Resources and Mineral Reserves. Our estimation and reporting strategy focuses on sustaining our mineral asset base by employing a responsible and innovative technical management team. The value extracted from the mineral assets is continuously reviewed with mine planning, considering evolving knowledge of the mineral asset's geological complexities and its opportunities.
Our projects, operations and expansion initiatives are built on trusted and assured Resources and Reserves, creating a platform for the LoM from which annual business plans are derived. The Resource managers of each operation are the custodians of the LoM and ensure professional execution of the business plans, stimulating profitability and return on investment while guarding against irresponsible exploitation.
Our Resource and Reserve statements, explanations on how we report (governance, assurance, competence and estimation) and comprehensive descriptions of our coal operations are aligned with section 12.13 of the JSE Listings Requirements and captured
in our CMRR report, a supplement to this report.
Our Coal Resources and Coal Reserves were estimated on an operational or project basis, and in line with the SAMREC Code for African coal properties and the Australasian Code for Reporting of Exploration Results, Mineral Resources and Mineral Reserves, 2012 edition (JORC Code) for the Australian coal property. The Exxaro annual estimation and reporting process is managed through the Exxaro geosciences as well as LoM policies and associated Coal Resource and Coal Reserve reporting and estimation procedures.
Exxaro reports Resource and Reserve estimates directly under management's control and for entities in which we hold a minority interest.
Exxaro's Coal Resources and Coal Reserves have been estimated or supervised by the Competent Persons supported by technical specialists and guided by corporate-appointed lead Resource and Reserve Competent Persons.
The Competent Persons are full-time employees at their applicable operations and their names, affiliation and relevant experience are provided in the CMRR report.
Assurance is implemented in terms of a three-tier system. Tier 1 assurance is conducted in parallel with our estimation processes by internal/peer technical specialists to ensure estimates with integrity. Tier 2 assurance consists of internal reviews conducted on operations or projects, when deemed necessary, to ensure compliance. Tier 3 reviews are comprehensive external Resource and Reserve estimation reviews conducted on a three-year operational cycle.
Grootegeluk mining area
Exxaro's attributable Coal Resources and Coal Reserves
Our total attributable Coal Resources decreased by 1%, primarily due to mining which was offset by new exploration information acquired at our various operations. On-mine drilling increased the level of geological confidence resulting in material movements from the Inferred to Indicated and to the higher confidence Measured category.
Two operations reported material changes in Coal Resources. A ~23% increase in total Coal Resources at Mafube mine is the result of new exploration information and the movement of the Rooipan area from Inventory to Coal Resources based on environmental approvals received to drill within this area.
A 15% decrease in Coal Resources at Leeuwpan mine is due to mining and disposals as a result of re-interpretation and subsequent reclassification of coal material outside LoM plan during the geological modelling process.
Our total attributable Coal Reserves increased by 1%, primarily as a result of revised LoM plans.
The significant increase (~144%) in the total Coal Reserves, at Mafube mine, is the result of an updated LoM plan including the Rooipan area after consideration of the successful submission of the integrated WUL application. The Coal Reserves within Rooipan are reported as Probable Reserves pending the approval of the integrated WUL.
Other than normal LoM depletion, no material changes to the total attributable Coal Resource and Coal Reserve estimates are reported for any operations.