Wallsie I think it is you that has made the fou par - 500k refers to the total ore mined not the number of high grade tons or DSO - I think W.W knows his stuff - and at 20% grade its lower than the Sandfire DSO- by way of comparison to CDU ( on topic ) here is their 6 months total june to dec 2012 when they were selling DSO prior to the concentrator being commissioned.