Ann: T3 Mine Feasibility Study Update, page-7

 I thought my figures seemed a bit light for the power saving in $ , would like to know where I went wrong 

refer to figure 9, its a graph of power requirements at different grind sizes for ore, yes this a different ore but the graph gives a general idea of making the ground ore  half the diameter ie from 4 sheets of paper in width to 2 sheets of paper in width doubles the power requirement 

http://www.scielo.org.za/pdf/jsaimm/v110n3/07.pdf, 

If the Bond milling index halved then the plant power consumption does not halve  it may just reduce 1/3  as ancillaries still draw much the same power ie pumps , flotation cells , conveyors  so its just my own personal  rule of thumb 

Also could you please tell me how you upload a file in this new HC like you did .