Engineering & Mining Journal

SEP 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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BLASTHOLE DRILLS 36 E&MJ • SEPTEMBER 2018 ing strata variation and improves fuel burn rates while extending the power unit's life," he said. The cab offers lowered interior noise, "exceptional" ergonomics, and a smooth ride and feel to help ensure operator com- fort, Collins said. Optional equipment in- cludes a microwave, USB ports for smart phones, and Satellite radio. The 77XR is available as multipass or single-pass, rotary tricone or DTH ham- mer, diesel or electric, which enables it to "accommodate the largest spectrum" of mining applications, from coal to hard rock, the company reported. It offers a bit range of 200 mm to 270 mm, with a max- imum single-pass depth of 16.8 m and a maximum multipass depth of 73 m. It can be equipped for an up to 203-mm DTH hammer with a maximum bit diame- ter of 229 mm. As was originally intended with the 77XD, the 77XR is "completely modular" and can "be reconfigured to adapt to the mine plan," Collins said. "Making these adjustments can be done during an ex- tended outage." Currently, the rig "is drilling in a vari- ety of different applications, with varying duty cycles, achieving high-performance results," Collins said. Those results garner feedback that can inspire future innovation, which helps further one of the company's other primary missions, he said. "We are committed to contin- ued growth and developing more models with the new efficiencies and innova- tion, such as those demonstrated with the 77XR." Optimizing the Entire Cycle This summer, Caterpillar ramped up commercial production of the MD6310. The blasthole drill rig, which replaced the MD6420C, was first announced roughly a year prior, following the spring 2017 release of the smaller MD6250. Both are ground-up Caterpillar designs, come technology ready, are "easily field-upgraded with the building blocks of autonomy," and feature standard- setting onboard operator stations, said Greg Scott, application specialist, drills, Caterpillar. Leveraging a century of drilling experi- ence from the Bucyrus and Reedrill prod- uct lines, Cat designed the rigs so each unit can be customized per the specs of both mine site and fleet, Scott said. Previously, "Caterpillar's legacy rotary drill family had several different control systems for seven different models, and each model was offered in multiple con- figurations," Scott said. Conversely, the new generation of Cat drills feature "a common control system, common compo- nents, and standardized layout, yet each model can be configured to best match the customer's application." The MD6310 drills 203-mm to 311-mm- diameter holes, and offers a maximum single-pass depth of up to 17.5 m, Cat reported. It can deliver a bit load of up to 86,000 lb. The MD6250 drills 150-mm to 250-mm- diameter holes, and offers a maximum single pass depth of up to 13.7 m, Cat reported. And it can deliver a bit load of up to almost 72,000 lb. Adjectives Cat used to describe the rigs include solid, flexible, rugged, reli- HI-G ® Machine with Polyweb ® Screens Innovative Addition to Your Tailings Management System An Environmentally Friendly, Cost Savings Solution HI-G Dewatering System For over 60 years, Derrick ® has provided the mining and minerals industry with fine particle separation technology. Our solutions are used worldwide by companies that require ruggedly dependable equipment for precise sizing and dewatering. Contact Derrick today to discuss your tailings dewatering project! n Recover and dewater the +30 micron fraction from your tailings stream n Produce conveyable and stackable material using an economically attractive process n Reduces the size of more expensive downstream thickening and filtration technology n Requires no expensive polymers or chemicals

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