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1. There is precedent for such a scheme (Although not quite as long) at the Selby super pit. 2. Although it sounds a long tunnel, on a mine of this type it is not particularly significant. Boulby has several hundred miles of tunnels in the salt layer under the potash carrying conveyors, these tunnels are in the order of 8m wide by 3.5m high, in what is ultimately uneconomic ground - it is mined this way in order keep the permanent accesses open, as the potash is too unstable for permanent mine infrastructure.
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