What must be obtained for permissible water pump usage in the return airways?

The correct answer is that approval from the Director is necessary for permissible water pump usage in the return airways. This requirement is in place because the use of water pumps in return airways can significantly impact ventilation and overall mine safety. The Director’s approval ensures that safety standards and regulations are adhered to, minimizing risks such as water accumulation that can affect air quality and lead to hazardous conditions for miners.

Factors such as the potential for flooding, the effects on air flow, and the quality of the return air must be considered when utilizing pumps in these areas. Therefore, obtaining approval from a regulatory body like the Director guarantees that the use of pumps is closely monitored and compliant with safety protocols, which is crucial for the protection of miners and the integrity of mining operations. Thus, this regulatory oversight serves as a critical component of mine safety management.