This research work is about the maintenance performances analysis and improvement of miscellaneous mining machinery and equipment used at the NORDGOLD SOMITA mining plant. The study started with a brief introduction to the mining activity. Then a general presentation of the TAPARKO mining site and its history was performed. Moreover, an overview of the equipment which is used on the mining site and its mechanical applications and utility was carried out. The maintenance plays a vital and essential role in the mining sector. A good maintenance management provides the plant with safe and effective equipment. One of the main issues in maintenance planning is to make sure that the planned maintenance tasks have positively influenced the productivity of the plant as expected. In order to achieve the desired performance at an optimal cost, the maintenance department has to keep monitoring the maintenance performances. This will help the company to reach the maximum profitability. Some maintenance key performance indicators exist and they allow the maintenance planners to monitor the maintenance effectiveness in a defined interval of time. Thus, a decrease of maintenance performances can be quickly detected and prompt corrective measures can be taken. Therefore, the necessary data was collected and an analysis of those indicators was accomplished. The obtained results revealed that. Last but not least, through a thorough examination of these results, some suggestions have been made in order to improve the mechanical maintenance practices in the mining sector.