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The term inferred reserves (unproved reserves) is commonly used in addition to, or in place of, potential reserves. The inferred coal reserves are regarded as being of a higher degree of accuracy than the potential reserves and the term is applied to those reserves that are estimated using an improved understanding of seam structure (see Proven reserves – above).

In the United States, inferred reserves (reserve growth) include those resources expected to be added to reserves as a consequence of extension of known fields, through revisions of reserve estimates, and by additions of seams (or coal strata) in discovered coal domains. Also included in this category are resources expected to be added to reserves through application of improved mining techniques.

This category thus includes both the indicated reserves and the inferred reserves described in earlier United States Geological Survey assessment publications. Predictions of reserve growth may refer to coal fields found before a specified year and the analysis of reserve growth in discrete conventional coal accumulations is based on the definitions and reports of the United States Energy Information Administration (EIA). In summary, inferred reserves are assessed by preliminary exploration and are part of probable reserves – the level of their probability assessment is low.