No coin nor oath required. For personal study only.
Unique Mine-Ventilation System.--The only one of its type in Canada, a towering 20-ton exhaust fan, shaped like a huge malted milk container, has been installed by The International Nickel Company of Canada, Limited, to ventilate the underground workings of the new caving project at its Creighton Mine in the Sudbury District of Ontario.
The giant vertical fan, driven by a 350-hp. motor weighing five tons, ventilates the workings by a flow of fresh air at the rate of 300,000 cu. ft. per minute. The fan draws the air down from the surface, directly through the caved or broken ore, circulates it through the underground workings and carries it back to the surface through a main return shaft. It is at the top of this shaft that the fan is mounted.
The fan stands 42 ft. above its concrete base, and the diameter at the inlet is 15 ft. The 124-in. impeller has 12 stainless steel blade~ which are adjustable in pitch through 25 degrees to accommodate the load as the mining operation moves farther from the main return air shaft.
In the caving method of mining at Inco's properties in the Sudbury area, gigantic masses of undercut ore, far underground, are induced to cave and disintegrate through tension and torsion as well as of their own weight. This low-cost bulk mining method, plus metallurgical practices, makes it practicable for International Nickel to recover and treat ore lower in grade than it has ever worked in underground mining. The supply of economically available ore has thus been broadened, enabling the Company to maintain its current nickel production at a post-war high. The bulk mining methods are part of Inco's $150,000,000 major long-range program of conversion to wholly underground mining.
As the Creighton caving program took shape on the drafting boards, primary consideration was given to devising a ventilation system which would provide for the flow of a steady stream of fresh air through the slusher drifts, passageways through which ore is drawn off after it has come through funnelshaped boxholes beneath the mass of broken ore.
The unique ventilation system is effectively servicing the caving project as it has been developed to date, and has ample capacity to handle ventilation needs under maximum operating conditions.
π SIMILAR VOLUMES
The application of finite element methods (FEM) is often restricted by the available computer capacity and the computing costs. The purpose of this paper, therefore, is, to present test results and to discuss possible ways of achieving a substantial reduction in computing times. Dividing the numeric
The most extensive action targeting the adoption of energy efficiency measures in small-and medium-sized manufacturing industries in Sweden over the past 15 years was project Highland. This paper presents an evaluation of the first part of this local industrial energy programme, which shows an adopt