What kind of surfaces can cause damage to detonating cord during loading operations?

• A. Smooth metal surfaces only
• B. Soft materials
• C. Contact with frozen chunks of stemming
• D. Dirt surfaces

Answer: (C)

The correct choice highlights the risks associated with frozen chunks of stemming during loading operations. When detonating cord comes into contact with these frozen materials, which can be hard and jagged, there is potential for damage to the cord's integrity. The impact of these frozen chunks can compromise the protective sheath of the detonating cord, leading to a risk of failure or detonation in an unintended manner, which is a critical safety concern in mining operations.

Smooth metal surfaces and dirt surfaces typically do not pose a significant risk of damage to the detonating cord. Smooth metals may allow for easier handling without causing wear that could lead to damage, while dirt surfaces generally provide a softer, less abrasive environment. Soft materials are similarly less likely to introduce the sharp impacts that frozen stemming can. Understanding these dynamics is vital for ensuring safe practices during the loading of explosive materials.