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steel grinding balls for ball mill gold mining; Grinding Steel Ball, Sag Mill Balls, Steel Ball For . Grinding Balls For Ball Mill. about us. Goldpro New Material Co., Ltd. was established in June 2010, the registered capital is 200.3 million（RMB）, with an area of 100,000 square meters, and has more than 260 employees, among them there are more than 60 technical RD personnel.