Engineering & Mining Journal

APR 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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Page 57 of 91

IN-PIT CRUSHING & CONVEYING 56 E&MJ • APRIL 2018 Modern belt conveyor systems are ca- pable of continuously transporting high volumes of material efficiently over long distances and challenging terrains nego- tiating through curves and rough relief areas. Recent conveyor installations ex- ceed 20 kilometers (km) in length with multiple thousands of tons per hour in capacity, and up to 25 megawatts (MW) of installed power. Although general- ly having greater initial capital costs, these systems are able to recover them through less operational costs stemming from the higher quantities of material moved, energy efficiency, reduced labor requirements, higher availability and low- er maintenance demands. Furthermore, they provide increased levels of safety and a smaller environmental footprint. TAKRAF, a global materials handling and minerals processing systems supplier, has a significant portfolio of diverse and unique references across an assortment of applications; from in-plant conveyors to large scale sophisticated systems with conveyors as the backbone. Three case studies demonstrate its broad spectrum of notable conveyor applications. Overburden Removal To expose the ore body or the coal bed, the overlying rock layers need to be re- moved, transported and deposited at a location some distance away. Handling such overburden or waste material, which has no value, dictates it be conducted as quickly and efficiently as possible. This requires moving very high capacities that only conveyors can accomplish at reason - ably low costs. Adding to this challenge is the consideration that must be given to system design for a number of important reasons, such as minimizing the impact on neighboring communities and properly reclaiming the land. A waste or overburden removal sys- tem in a hard-rock application typically consists of a crushing station that feeds conveyable size material to an overland conveyor arrangement that brings it to a stacking facility at the deposit zone. Vast amounts of this overburden must be placed, often in layers, in a continuous operation over a very large area. High-ca- pacity extendable and shiftable conveyors are required along with mobile machines that only shut down for short periods of time to relocate or extend. When the waste removal stops so too does the pro- duction of ore. An open-pit copper and gold mine in Mexico was looking for a solution to move approximately 55 million tons of waste material per year. TAKRAF designed and supplied a material handling system with overland conveyors and stacking equip - ment with shiftable and extendable con- veyors. The system was designed with a capacity of 12,000 metric tons per hour (mt/h) and consisted of an extendable conveyor with a self-propelled crawler mounted drive station, a shiftable con- veyor with self-propelled crawler-mounted tripper car, and a crawler-mounted slew- able spreader. Advanced Systems Offer Consistent Low-cost Material Handling Solutions TAKRAF discusses three recent projects TAKRAF's material handling system for waste material in Mexico with overland conveyors and stacking equipment. (Images: TAKRAF)

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