What is a "downline" in detonating cord blasting?

• A. The length of the detonating cord in the blasting hole
• B. The detonating cord to which downlines are attached
• C. The detonating cord to which either or both branchline and downlines are attached
• D. The connecting point for multiple blasting charges

Answer: (A)

In the context of detonating cord blasting, "downline" refers specifically to the portion of the detonating cord that serves as a connector for branchlines leading to the actual explosive charges. This is critical for initiating a blast and ensuring that the energy from the detonation travels effectively to the explosives.

The correct choice illustrates that the downline refers to the physical extension of the detonating cord which is important in orchestrating the timing and sequence of the blast. By understanding that a downline is specifically designed to carry explosive signals, one can appreciate its role in maximizing the blast's effectiveness and safety.

This understanding informs the proper handling and installation of blasting equipment, ensuring precision and adherence to safety protocols during blasting operations. Recognizing the specific functions of components like the downline is crucial for a shift boss to effectively manage blasting procedures and mitigates the risk of accidents in the field.