applied roll mining machine in gold mining. applied roll mining machine in gold mining. precision pulley and idler is a 100 employee owned global provider of high performance, innovative conveying components and solutions.ppi was founded in 1977 with the goal of providing mining and aggregate industries with the highest quality components and the,bitcoin mining machine,bitmain antminer s19pro 110t asic miner btc bitcoin miner mining machine 3250w antminer s19 pro 110th/s include psu and power cords. $12,080.00. $12,080. . 00. free shipping. only 9 left in stock - order soon.