What is the flash point value that necessitates the creation of a standard operating procedure for dealing with flammable substances underground?

The flash point of a substance is the lowest temperature at which it can vaporize to form an ignitable mixture in air. In the context of Queensland's mining regulations, specifically when dealing with underground operations, the flash point plays a crucial role in ensuring the safety of workers and preventing fires or explosions.

A flash point value that is below 61 degrees Celsius is significant because it indicates that the substance is considered highly flammable and poses a substantial risk when present in an underground environment. Therefore, when flammable substances have a flash point below this threshold, it necessitates the implementation of a standard operating procedure (SOP) to manage the associated risks effectively.

Having procedures in place when dealing with these substances ensures that proper handling, storage, and emergency measures are followed, thereby enhancing safety protocols within the mining operation.

When evaluating the other values presented, a flash point above 60 degrees Celsius (including the options citing values at 61 degrees Celsius or higher) does not trigger the same level of concern or the requirement for a specific SOP, as these are considered less hazardous in comparison to those with lower flash points. Hence, the correct answer is the one that emphasizes the requirement for controlling substances with a flash point below 61 degrees Celsius.