Engineering & Mining Journal

JUN 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 89 of 115

PIT DEWATERING 88 E&MJ • JUNE 2018 are problematic for conventional mud or conventional air drilling. The DTFR method is distinguished from other drill- ing methods by the way the drill cuttings are returned to the surface through the drill string, whereas with conventional mud or air operations the cuttings are returned up the annulus. The DTFR method of drilling has several advantages as far as how the cuttings and mud are handled. Cuttings return quicker than a conventional mud method. They do not commingle with the annulus, as with conventional drill- ing systems, eliminating contamination and reducing annular washouts or hole enlargement. Cutting return via the drill string means that mud loss will not stop drilling operations as long as the drill bit remains submerged. The mud system is a closed loop. Cir- culation is seldom lost and mud can be replaced during drilling operations with- out the need to stop. Using a special mud tank and drill cutting exchange, DTFR greatly reduces the drilling footprint com- pared to conventional mud drilling oper- ations. Formation water is not an issue during drilling with almost zero discharge during drilling operations — making wa- ter management a non-issue. DTFR mud circulates in the annulus under ambient pressure conditions re- ducing development time. The residual mud is easily removed from the annulus wall during development. In addition to faster and more complete mud removal, the amount of discharge water managed at the surface is lessened due to the re- duction in development time. Dealing With High Volumes of Water The challenge in the Pilbara was to re- duce drilling and completion times, han- dle difficult ground conditions, reduce development time, manage discharge water in active mines and complete wells to target depths. The Boart Longyear DTFR drilling method was employed suc- cessfully at active mine sites in the Pil- bara region, where a high volume of water was discharged during drilling, without hindering active mining operations. Historically, these operations used conventional air drilling or dual rotary drilling to set large-diameter water sup- A global leader in bulk handling equipment has introduced an innovative technology that uses the kinetic energy from a moving conveyor belt to generate enough power to run a wide variety of electronic systems. The Martin ® Roll Gener- ator™ is designed to create a self contained mini power station that allows operators to run electrical monitoring systems and safety mech- anisms. Able to be retrofitted on existing idler support structures, the new design is a step toward eliminating power production obstacles as conveyors move into the next generation of "smart systems" that are more autonomous and sustainable. Running auxiliary power can be both com- plicated and costly, requiring expensive labor and oversized cables to accommodate the in - evitable voltage drop over long runs, as well as transformers, conduit, junction boxes and oth- er components. In many operations, this lack of available power means that any monitoring of the conveyor must be done by technicians physically walking the length of the structure, which can be a difficult and time-consuming task when the systems are long and span diffi- cult terrain. A more efficient approach is to employ sen - sors to transmit important data from remote points to a central location where it can be monitored in real time and recorded for later analysis. "We found that we could draw energy from a moving belt by attaching an independent generator directly to one of the rollers," said Paul Harrison, Global Engineering Manager. "This way, the conveyor could produce power without altering the structure of the system or affecting its physical configuration." The roll generator is held in a fixed position by the roll support system, but is not normal- ly required to bear any of the material load. The unit is sealed from fugitive material and forms an integral unit independent of the con- veyor roll. All components to 'condition' the power to a steady 24VDC are enclosed in a protective cabinet, typically mounted directly on the idler support slide. The capability to store power in a small battery bank is already in development, allowing the generator to produce 5-10x high- er amperage for short periods to power high - er-wattage devices. New Technology Generates Power Using Conveyor Belt Kinetic Energy COMPANY PROFILE-PAID ADVERTISEMENT

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