An Inventory Approach to Humanizing Work and Working Environment in Indian Underground Coal Mines
Vol. 3 Issue 3 : 2015


Reporting of productivity alteration due to environmental stress on face drillers (FD) in India is scarce. In this study the heat strain of twenty healthy FD was evaluated during their actual work at varying depth of working. Working heart rates (WHR) were measured for all the participants and compared between two groups of miners from Mine A and Mine B. Environmental data was collected throughout the shift. Mean Working Heart Rate (WHR) was 141-148 beats/min and 139-145 beats/min for Mine A and Mine B FD respectively. It was observed that FD often exceeded the recommended limits of cardiac strain indices. The job seemed to be “heavy” to “very heavy” in accordance with the job heaviness scales. Existing heat stress in terms of effective temperature (ET) was above the recommended limits proposed by WHO in case of Mine A while the ET value was within the recommended limits in Mine B. FD in coal mines were exposed to excessive physical strain and heat stress. Therefore, individual performance as well as productivity decreased with the adverseness of the environment.