Abstract: A blast hole liner is provided having an outer sleeve and an elongate tubing located within the outer sleeve. The outer sleeve is provided with an open first end thereby forming an internal space, adapted to hold an explosive composition. The outer sleeve also has at least one compartment 5 formed in a second end. The elongate tubing is adapted to allow for the entry of compressed air to inflate the elongate tubing and thereby ensure straightening or untwisting of the outer sleeve.

Abstract: An inflation fluid suitable for inflation of a borehole plug is provided which has distinct advantages in operation. The inflation fluid comprises water, dimethyl ether, propane and butane. Such a blend offers efficient inflation of the borehole plug and reduces the time to flammability of the expelled fluid compared with similar water/dimethyl ether only blends. The order in which the water, dimethyl ether, propane and butane are blended to form the inflation fluid has been surprisingly found to have a significant effect on the time to flammability of the subsequently expelled fluid.