OptimizatiOn Of COal Overburden exCavatiOn COnsidering variable geOme-ChaniCal prOperties and states Of exCavatOr teethWe examine the impact of overburden geomechanical properties on the velocity of the excavator rotary movement V b and on the excavator current consumption I max for two different states of excavator teeth: new excavator teeth and worn-out teeth after minimum 250h of work. the analysed dataset is collected from recordings made by the bucket-wheel excavator Schrs 900 25/6 operating at "tamnava eastern field" open-pit coal mine in Serbia. the following geomechanical properties of the overburden are examined: grain size composition, unit weight, cohesion and angle of internal friction. Using multiple linear regression analysis, we develop explicit mathematical correlations between I max and V b and the overburden properties in a form of nonlinear equations for the case of new excavator teeth, while statistically significant correlation for the worn-out teeth is obtained only between overburden geomechanical properties and I max . Results obtained indicate the existence of statistically significant two-factor interactions with positive effect of overburden unit weight and angle of internal friction on I max and V b , while cohesion is generally inversely proportional to the analysed outputs. Analysis performed enables optimized planning of the excavator performance regarding its productivity during the overburden excavation.