OneTunnel | Copper Mountain: Overview on the Grinding Mills .
WEBJan 1, 2012 · This paper will first give a short overview of the Copper Mountain project in British Columbia, which just has started commercial operation earlier this year. The grinding process with one 34' x 20' SAG mill and two 24' x ' ball mills will be briefly discussed. All three mills are gear driven by a ring gear, dual pinion and two low speed .