Abstract: A mining machine (102) for rock excavation, comprising: a rotatable cutting head (104) having cutting elements (108); a holder (110) for holding the cutting head (104); a movable thrust unit (112) attached to the holder (110); a machine body (114) attached to the thrust unit (112); a thrust apparatus (118) for moving the thrust unit (112) between retracted and extended positions and for pushing the thrust unit (112) forward, thereby pushing the cutting elements (108) into a rock formation; a hydraulic pump (122); a hydraulic consumer (125); and a hydraulic line system (126) for connecting the hydraulic pump (122) to the hydraulic consumer (125). The hydraulic line system (126) comprises first hydraulic lines (126a) attached to the machine body (114), second hydraulic lines (126b) attached to the thrust unit (112), and two telescopic hydraulic line units (128). Each telescopic hydraulic line unit (128) connects one (126a) of the first hydraulic lines (126a) to one (126b) of the second hydraulic lines (126b).