To: Bob Walsh who wrote (6744 ) 7/17/1998 9:02:00 AM From: Chuck Bleakney Read Replies (1) | Respond to of 14226
For the ball mill monthly costs I was using the posted figure in the GPGI bulletin board of "$15,000 per week"... if this is an error then I don't think that I should be held accountable for it... <VBG> As for ball mill production, I'm in error and was confusing the output of the leaching process = output of ball mill... thanks for the correction. That ball mill production equates to about 3000T per month or $3,000,000 before costs. At that production level the associated costs and yields should be significantly different so I won't bother to do the rest of the math... Yes there are more than 4 weeks to a month, but with vacations, holidays, etc this is still a good approximation of reality. It appears our final numbers are similar... they still are making a comfortable profit over costs at 10T per day. One question, do the fixed costs include the cost of materials for inquarting? While this is not lost, it is tied up in the process until it is recovered, and it is subject to processing fees. If the turnaround is 2 months, then 2 months of inquarting supplies needs to be figured into the pipeline... this tied up expense may not be insignificant depending upon the amount(s) used for inquarting. As an observation, it seems to make more sense to me that GPGI should concentrate on processing it to the metal bead stage and then ship this to Sabin for further processing. Other than that they should be experimenting with a portion of the flow to see how they can materially affect the recovery process to be more efficient. So it does not make sense to me that they should be increasing their number of resin columns much beyond what they have now. Increasing the number of tanks for the leaching process and their ability to make cake from the solution is where their efforts should be focusing... With the temps reaching the 110+ region down there these days the drying process ought to be be working quite well at this moment... Chuck