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Potential reserves (probable reserves, possible reserves) are the additional reserves of coal that are believed to exist in the earth. The data are estimated (usually from geologic evidence) but have not been substantiated by any drilling or coring operations. Other terminology such as probable reserves and possible reserves are also employed but fall into the subcategory of being unproven.

In summary, potential reserves are those contingent reserves that, as of a specified date, are potentially recoverable from known accumulations coal fields but the applied project(s) are not yet considered mature enough for commercial development due to one or more contingencies. Potential reserves may include, for example, projects for which there are currently no viable markets, or where commercial recovery is dependent on technology under development, or where evaluation of the accumulation is insufficient to clearly assess commerciality.