Iron Ore /Gold Ore /Copper Ore Mining Equipment Spiral Classifier. US $4000-$40000/ Set. 1 Set (Min. Order) 13 YRS Zhengzhou Hengxing Heavy Equipment Co., Ltd. 84.0%. Contact Supplier. Compare. The seat of the machine features channel steel material, while the body is armor plated and the spiral axle is made of cast iron for durability.