US $4300-$4500/ Set. 4 Sets (Min. Order) CN Zhengzhou City Wanqi Machanical Equipment Co., Ltd. 9 YRS. 85.5%. Contact Supplier. Only when the wet pan mill/ gold ore grinding machine run smoothly then start to feed the raw material into the grinding pan. B. When repair the machine, pls remove the V-belt to keep the machine in a safe condition.