development drift

development drift

[də′vel·əp·mənt ‚drift]
(mining engineering)
A tunnel dug in a mine either from the surface or a point underground to get to coal or ore for exploitation or mining purposes.
References in periodicals archive ?
The company has established a 166 feet development drift that will serve as the main haulage for future mining activities at the Mineral Hill Gold Mine.
The majority of the drilling will be conducted from sites on the hanging-wall development drift at the 1,270-m level and from the footwall ramp below the 1,150-m level.
We have a huge development drift in the very bottom of the mine on the main decline drift and at the brow of that drift there is water coming out that just runs down the ramp.
The test drive on five level commenced in May this year: the MM130 is excavating a development drift some 300 m long on the straight and level and will then drive a curve with a 20 m centreline radius and finally an 8|degrees~ decline.
In early April, unexpected groundwater coming from a development drift forced the suspension of Cameco's underground McArthur River uranium mine in northern Saskatchewan.
This allowed the mining of a partial parallel development drift which could be varied in width to follow exactly the limits of the hanging wall The initial drift was supported with a line of timbers.
6 million to drive 6,500 ft of decline and development drift into the Golden Promise mine.
A development drift connecting the Escondida and El Victor Zones was initiated to complete development drilling from underground along a two kilometer mineralized structural corridor.
The recently started underground development drift (Total length target: 1250 meters) and subsequent surface and underground core drilling program of 67,000 meters will be used to study the possible extensions of the deposit as well as add additional areas of investigation down dip.
For RMR's from about 35-60 (Fair Rock) most characteristic of rock surrounding the ore and in development drifts, shotcrete can be thought of as acting as an arch," the report stated.
Pre-production from the main development drifts is scheduled to start in three weeks.
Each of them is organized with parallel development drifts, following the dip of the gypsum beds, from which the exploitation drifts reach out with a steady angle, following the strike of gypsum strata (Fornaro et al.

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