The purpose of this paper, therefore, is to find out whether in the course of task performances, miners engage in activities influenced by their tacit knowledge to enhance the quality of the maintenance process for high technology equipment in deep mines. Guided by an organizational activity theoretical framework, data was collected by observing and interviewing four different mineworkers engaged in rock drilling and roof bolting activities in an underground mine. An interpretive descriptive analysis was conducted to understand the mineworkers activities when engaged with their work. It is found that the miners use their acquired experiences to find ways of maintaining and managing the machines they use for optimum work performance. It is concluded that an employee’s tacit knowledge, when made visible, can help determine the horizon of possible actions that can influence either positively or otherwise on the maintenance process.