What is the maximum charge of permissible explosives permitted for a hole that is 6 feet or deeper?

The maximum charge of permissible explosives for a hole that is 6 feet or deeper is set at three pounds. This specification is based on safety regulations that govern the use of explosives in mining operations, particularly to control the energy release during blasting and to minimize the risk of fly rock and other hazardous conditions.

In practice, using three pounds as the maximum charge helps ensure that the explosive energy is sufficient to fragment rock without causing unintended damage or safety risks. The guidelines are put in place to balance efficacy in blasting operations with the need for maintaining safety protocols, protecting miners and nearby infrastructure, and complying with regulatory standards designed to govern explosive use in underground environments.

Ultimately, this limit reflects industry best practices established through research and experience in managing the use of explosives effectively and safely in mining operations.