Talk:Drift mining
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Terms used:
Drift: Tunnel Jumbo: Mechanised drill used to drill off a round Taking a Round: The act of placing holes strategicly in rock, at any given depth, loading them with explosives and blowing them up systematicly in order to advance the drift. Jack Leg: A drill weighing roughly 1110-115Lbs. Conventional method of drilling a round. Bolting: installing metal bolts, 6' to 8' (in some cases 21' cable bolts are used.) in order to lock the ground above your ahead into the ground above it, which keeps the worker safe. tram: move muck with haulage equipment.
Typical Jumbo drifts usually range from anywhere between 14'x14', to 17'x20'. Jack-Leg headings are much smaller, usually 9'x9', or 9'x11'. The cycle of driving the drift involves mucking which is to tram muck, or haul it with haulage veichles, bolting for ground support to keep your drift reasonably safe, drilling off the round (rounds can be anywhere from 6' to 12' in depth), then loading, and blasting, which involves loading the holes in the round with explosives, wiring them up then systematicly blasting them, the goal is to break the entire depth of the hole for maximum advancement of the drift. It is good practice in the Sill drift(JackLeg drift) to keep the services (air,water pipe)30' from the face. And the ventilation even futher, so that it does'nt get peppered and ripped apart during the blast.
When I have time I will explain in detail how the blast is systematicly wired up so that the full depth of the round breaks. We will go over cuts, and drilling patterns that are proven to work in hard ground, and soft ground. We will also go over teqniques on the jack-leg, scoop tram (used for mucking out a round) and jumbo that make life a hell of a lot easier.
To be continued...
