A calculational method presented in part 1 is improved on the basis of additional technical analysis data (the heating value, ash content, carbonate content, moisture and sulphur content). The technical analysis data permit calculations of the type presented in part I to be carried out for actual samples, and provides the correction coefficients DeltaW, DeltaCO(2m) as well as the FeS2 content of the sandy-clay part to be determined. Here are descriptions of two calculations for preparing the data for the basic calculation (see Calculation 1 in part 1). Calculation 2 allows finding the composition of oil shale and its combustion products on basis of technical analysis data for the dry fuel and Calculation 3 using data for as received fuel. In addition, the significance of different elemental composition-based methods for estimating the heating values of the oil shales is explored. This basic input to the calculational model can be influenced by which well-known correlation is employed. (C) 2003 Published by Elsevier Ltd.