Engineering & Mining Journal

OCT 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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62 E&MJ • OCTOBER 2018 www.e-mj.com Like a beacon flash parting the midnight horizon and warning of the shallows, the future announces its arrival beforehand. In mining, in the hoist space, such was as much the case in the Witwatersrand Goldfields of the 1950s as it is in the Sudbury Basin and the Gobi Desert today. The projects and innovations of then and there, and here and now, shed light on the challenges and opportunities to come. Summaries of some major headline-grab- bing hoist and hoist infrastructure engi- neering projects illustrate that point. Deep Made Possible Start with when Blair multi-rope (BMR) hoists were first deployed to deep South African mines in the late 1950s and early 1960s. The BMR features two independent, two-compartment drums and two ropes per drum, each of which attaches to a skip via its own head sheave. Coverage from back then re- ported "continuous equalization of rope tension is effected either by a simulta- neous coiling or uncoiling of the ropes on a compensating drum attached to the conveyance or by movable headgear sheaves supported on interconnected hydraulic cylinders, which permit the sheaves to move in vertical guides." 1 Compared to a single-rope drum hoist, the BMR featured at least dou- ble the rope. Compared to double- drum hoists, "smaller ropes could be used," and the drums were of a smaller diameter. The smaller ropes, drum and, in turn, motor, allowed for easier instal- lation underground. With the skip load "distributed equally on two ropes, … payloads can be increased, and deeper hoisting is possible." By 1961, BMR hoists were deployed to South African mines operated by Anglo American Corp., Zandpan Gold Mining and Buffelsfontein. Anglo Amer- ican installed one at President Brand An overhead crane moves equipment and parts during installation of possibly the largest production friction hoist in the world, at Oyu Tolgoi. (Photo: The Redpath Group) HOISTING SYSTEMS HOISTING SYSTEMS By Jesse Morton, Technical Writer productivity and depth of wind Recent projects leverage solutions that ensure future safety, Tomorrow's Priorities Today's Hoists Reveal 1 "Blair Hoist Reaches Lower, Lifts More With Smaller Ropes." (1961, November). The Engineering and Mining Journal, 162 (11), 112.

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