If I understand you correct mu50stang is how much total yardage you will have moved including waste to arrive at one yard of 1/8 classified material. Ofcourse it depends on how many large stones you throw into the classifier but my experiance has been on average if I fill a 5 gal bucket with material and then classify it down to 1/2 then 1/4 the 1/8 I will on average throw away about 1/8 of each classification or about 1/4 of the original 5 gal bucket. So you would have dig an aditional 10 buckets of material to get a yard of 1/8 classified material. Again this is approximate. Hope my math is right.