Abstract: A process for the production of cement raw mix which takes into account variations which may occur in the raw materials being introduced into the raw mix, particularly such variations which occur in the limestone. The process disclosed involves the periodic adjustment in the estimated chemical composition of the raw materials used to produce the raw mix in response to the degree of divergence between the actual proportions (W.sub.i) of the raw materials mixed and the "theoretical" proportions (T.sub.i) which theoretically would have generated the raw mix that was produced over the previous time interval. Based upon the revised estimated chemical compositions, the desired characteristics of the raw mix over the next specific subsequent interval are reselected to adjust the overall chemical composition of the raw mix towards the overall desired characteristics, while maintaining continuity in the raw mix being produced and avoiding undesirable fluctuations in the composition.