Mining in Manitoba

Topslice Mining

Engineering Considerations

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The mining of the orebody starts at the top and proceeds in 10 high slices downward. The ore removed at the level below. The cover ore above the mining area is caved after each slice is removed.

This method is limited to that type of ground which precludes overhand mining as the back cannot be relied upon for self-support over limited mining spans. The cover rock is separated from the mining operation and controlled by a timber mat reinforced with wire mesh screening. The mat is established on the  first cut. As the cut advances suporting timbers behind the face   are pulled to induce an even subsidence. With the mat established this timber and that on subsequent cuts is left to reinforce it. The control provided permits mining to a grade approximating that of the ore in place.