This thesis focuses on maintenance practices and performance in the context of underground mining. Analytical techniques for evaluation of a mine's maintenance performance using equipment failure and repair time data are presented. The efficacy of these techniques is illustrated through a case study of the mobile equipment in an underground mine operating at high altitude. Data from the case study is analyzed and recommendations for improvement in the maintenance process at the mine are made. Requirements for an effective condition based maintenance program are formulated based on observation of the shortcomings of the oil analysis program in place at the mine. In a similar manner, evaluation of the failure and repair data is used to identify where imprecision of records limits the usefulness of the data.