RE-THINK NICKEL Nickel-Iron Alloy … a Stainless Steel Open Pit .Ticking all the boxes. Conventional Open Pit Mining. • Bulk mining operation. • Truck and shovel. • Low strip ratio 0.17:1. Conventional Metallurgy. • Physical processing using off- the-shelf equipment. • Magnetic separation followed by gravity concentration. • Concentrate or pellet product grading 13.5% Ni, 50% Fe and.stainless steel equipment in open pit mining,Mining Brochure - UEEIt is constructed out of high- quality stainless-steel, and has a funnel that directs samples through a funnel. . Open Pit Copper Mine, Canada – 13.8kV Mobile Substations. Underground Gold Mine .. UEE supplies underground mining equipment to major mining companies, both domestically and internationally. Whether it.