Abstract: In mining rights mortgage value assessment, the retained service time in mine is calculated based on retained reserve and production capacity of mine. when the retained service time in mine is shorter than the valid mining period of mine license, the retained service time in mine is regarded as the assessed service time of mine. As the retained service time in mine is longer than the valid mining period of mine license, the valid mining period of mine license is regarded as the assessed service time of mine. The assessment of mining rights mortgage value has shown that the assessment method is well worth developing because of its assessing results well to reflect real mortgage value of mining rights.