A PECULIAR feature of mining in the Central Mine (The Sulphide Corporation Ltd.) is the continued shrinkage or subsidence going on in the upper levels, following on the extensive creep movement of some seven or eight years ago. The cause of these creep-movements was primarily the huge size of the ore-body, which can best be illustrated by the fact that between the 300 and 800-ft. levels and in a length of less than 1000 ft. some four and a half million tons have been proved and partly extracted; but there were also a number of strong contributing causes. In the first place the shape of the ore-body is unfavorable, the huge widths of ore-up to 420 ft.-on the 400, 500 and 600-ft. levels being overlain chiefly by almost horizontal strata of weak schists. Then again the footwall lay on a well-defined fault, marked by a layer of fine breccia which was converted into a. perfect lubricating material by the action of water from the first concentrating mill, which was built on the outcrop. The ore itself is exceptionally heavy and weak in cohesion, and the hanging wall treacherous. All these adverse conditions combined to make creep-movements inevitable sooner or later, and the recognition of this fact led to the introduction by Mr. C. F. Courtney, then Mine Manager, now General Manager of the Sulphide Corporation Ltd., of the pillar and stope system of mining.