This work presents a set of linguistic variables for modelling some geologic and morphological features of a coal seam. Since self-advancing winning coal systems and their interactions with coal faces represent extremely complex situations where traditional mathematical models are unable to offer working solutions, we explore the viability of using Fuzzy-logic based techniques in order to obtain a good-enough model that allows technicians at mine to get a better understanding of the variables at play and to foresee the coal production.