Different reserves classification systems are used across the world, with the two main, international ones being developed by/under the Committee for Mineral Reserves International Reporting Standards (CRIRSCO) and the United Nations Framework Classification for Fossil Energy and Mineral Reserves and Resources (UNFC).
CRIRSCO, the Committee for Mineral Reserves International Reporting Standards, provides an international forum that enables countries to ensure consistency of their reporting standards in an international setting.
CRIRSCO Members are National Reporting Organisations (NROs), i.e. bodies which develop and are responsible for mineral reporting codes, standards and guidelines for a country or a group of countries: JORC for Australasia, CIM for Canada, ComisiOnMinera for Chile, NAEN for Russia, SAMREC or South Africa, SME for the USA, and PERC for Europe.
Many industrial minerals companies use the PERC (Pan-European Reserves and Resources Reporting Committee) code system.