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...

who wrote this? A 10 year old? —Preceding unsigned comment added by 192.91.171.36 (talk) 21:39, 5 May 2009 (UTC)[reply]

More Generally

....In the english speaking world a 'drift mine' refers to an underground mine which is entered from the surface by an inclined or level tunnel which crosses the geological measures. An entry which is in a single stratum, coal seam or otherwise, is a heading, a surface entry which is delibrately level (save for a drainage gradient) is called an 'adit' or a 'level'. These terms are often used loosely. A cross-measures tunnel which is completly underground (i.e. does not connect directly to the surface) is almost always a called a drift except in a horizon mine when it might be a 'horizon' or a level. If it is really steep and in a metal mine it will probably be a rise or a winze depending on whether it was driven upwards or downwards ..This should be confusing enough to show that the article as it is at present, June 2009, is quite misleading.......92.238.234.172 (talk) 15:56, 12 June 2009 (UTC)mikeL[reply]

Ascending and Descending a Drift Mine

The Trummelator is an escalator designed for use in open cast and drift mines. It is installed in underground tunnels with an incline of between 1:5 and 1:12.

The Trummelator is powered by a variety of sources, dependent on availability at the location in which the Trummelator is installed. A common power source is compressed air. However a Trummelator extending more than 200ft requires 5000psi, which often presents significant problems, mainly because of limitations in available space and the size of a generator capable of producing such volume. —Preceding unsigned comment added by Chillipeppa (talk • contribs) 13:35, 12 October 2009 (UTC)[reply]

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