What type of shot is prohibited in any mine?

The reasoning behind the prohibition of adobe or mud-capped shots in any mine relates primarily to safety and effectiveness in blasting operations. Adobe or mud-capped shots involve using an earthen material to cover explosives, which can obstruct the blast's energy and significantly diminish its effectiveness. This type of shot does not provide the proper confinement needed for an effective explosion, leading to unpredictable results and potential hazards.

Furthermore, using adobe or mud can introduce additional risks such as the possibility of misfires, where the blast does not occur as intended, or creates excessive debris and flying materials. Such scenarios can endanger the lives of miners and complicate emergency response situations. Regulating this practice helps to maintain safer working conditions in the mining environment.

In contrast, the other options, while they may have specific regulations associated with them, do not carry the same inherent risks or ineffectiveness that mud-capped shots present.