Shaft Sinking Through Heavy Overburden at Falconbridge
THE Falconbridge property is almost completely covered with overburden to a depth varying from 60 to over 200 feet . This overburden consists of grave], sand, and boulder, with bands of very fine silt, and there is usually a layer of water-bearing quicksand adjoining the r:ock surface. In previous shafts sunk at Falconbridge, this water-bearing quicksand had given considerable trouble, and further difficulties were expected in sinking No. 5 shaft, due to its greater size. The method described in this paper is the one adopted in sinking this shaft, after the matter had been carefully considered.
Concrete, headframe, norite, overburden, quicksand, shaft, Headframes, Overburden, Rocks, Sand, Shaft sinking, Shafts, steel, Steels