Splice monitoring system for a conveyor belt in mining industry, comprising • a driving pulley (16, 42) for driving a conveyor belt (12, 44, 72), • a return pulley, a first pulley (22, 48) and an optional second pulley (24, 50), • a conveyor belt (12, 44, 72) with at least one splice (14, 46, 74) which is guided around a part of the circumference of the first (22, 48) pulley, around a part of the circumference the driving pulley (16, 42) and around a part of the circumference of the optional second pulley (24, 50) if applicable, and around a part of the circumference of the return pulley, • wherein the first pulley (22, 48) is located before and the optional second pulley (25, 50) is located behind the driving pulley (16, 42) related to the designated movement direction of the conveyor belt (12, 44, 72), characterized in that • means (26, 28) for determining the respective circumferential speeds of at least two pulleys during operation of the conveyor belt (12, 44, 72) are foreseen, wherefrom one is the first pulley (22, 48) and the other is the driving pulley (16, 42) or the optional second pulley (24, 50), • an evaluation unit (34, 92) is foreseen and respective determining values of the circumferential speeds of the pulleys are provideable (30, 32) thereto, • the evaluation unit (34, 92) is foreseen to determine continuously - based on at least an analysis of the difference of the circumferential speeds of the pulleys over a time span - a value describing the stiffness of the respective section of the conveyor belt (12, 44, 72), which is currently located inbetween the at least two pulleys and • the evaluation unit (34, 92) is foreseen to provide a warning signal in case that the value for the stiffness is falling below a certain limit. • a driving pulley (16, 42) for driving a conveyor belt (12, 44, 72), • a return pulley, a first pulley (22, 48) and an optional second pulley (24, 50), • a conveyor belt (12, 44, 72) with at least one splice (14, 46, 74) which is guided around a part of the circumference of the first (22, 48) pulley, around a part of the circumference the driving pulley (16, 42) and around a part of the circumference of the optional second pulley (24, 50) if applicable, and around a part of the circumference of the return pulley, • wherein the first pulley (22, 48) is located before and the optional second pulley (25, 50) is located behind the driving pulley (16, 42) related to the designated movement direction of the conveyor belt (12, 44, 72), • means (26, 28) for determining the respective circumferential speeds of at least two pulleys during operation of the conveyor belt (12, 44, 72) are foreseen, wherefrom one is the first pulley (22, 48) and the other is the driving pulley (16, 42) or the optional second pulley (24, 50), • an evaluation unit (34, 92) is foreseen and respective determining values of the circumferential speeds of the pulleys are provideable (30, 32) thereto, • the evaluation unit (34, 92) is foreseen to determine continuously - based on at least an analysis of the difference of the circumferential speeds of the pulleys over a time span - a value describing the stiffness of the respective section of the conveyor belt (12, 44, 72), which is currently located inbetween the at least two pulleys and • the evaluation unit (34, 92) is foreseen to provide a warning signal in case that the value for the stiffness is falling below a certain limit.