Abstract: A downline wire (10) serves to connect a location on the ground surface to at least one detonator (52) in a blast hole. The downline wire includes at least two flexible electrical conductors (12, 14) encased by respective flexible layers of an insulating material (20, 22) and a flexible sheath (24) in which the insulated conductors are embedded. Each conductor (12, 14) is made of a copper-clad steel core and the insulating material is either a filled flexible polyvinylchloride (PVC) composition or a polyester elastomer. The sheath (24) is made from a medium or high density polyethylene compound which includes carbon black.

Abstract: A downline wire for connecting a location on surface to at least one detonator in a blast hole, the downline wire including at least two flexible electrical conductors, a respective flexible layer of an insulating material which encases each conductor, and a flexible sheath in which the insulated conductors are embedded, wherein each conductor comprises a steel core which is clad with copper, the insulating material is selected from a filled flexible polyvinylchloride (PVC) composition and a polyester elastomer, and the sheath is made from a medium or high density polyethylene compound which includes carbon black.

Abstract: A spool for use in a blasting system which includes a coiled signal transmitting conductor connected at one end to a detonator and at a second end to a connector, wherein the detonator and the connector are engaged with retentive formations on a face of a flange of the spool.

Abstract: A spool for use in a blasting system which includes a coiled signal transmitting conductor connected at one end to a detonator and at a second end to a connector, wherein the detonator and the connector are engaged with retentive formations on a face of a flange of the spool.