elder-miner Posted June 7, 2013 Share Posted June 7, 2013 Attached PDF for those placer miners who have never seen it.Good info IMHOClarkson_Riffle_Test.pdf Quote Link to comment Share on other sites More sharing options...
Steel Pan Posted June 7, 2013 Share Posted June 7, 2013 You couldn't have posted this at a better time. Been wantin' to redo my riffles for awhile, now I canfine tune them.Currently, 1:1/1.5 slope, 1" high riffles.Riffles sloped ( approx. 45*) down stream at about 4"separation. I changed from a 1.5" nozzleto a 3" this year. Water/material jumpsover every other riffle. I need to read somemore of the file, I may change to an upstream "tilt" to myriffles and rethink my spacing. Oh ya, I'm puttingtogether a ten inch wide sluice to replace the 8".Cutting the length from 18 to 12'. Quote Link to comment Share on other sites More sharing options...
klunker Posted June 7, 2013 Share Posted June 7, 2013 Thanks. I'll print that info up sand study it a bit more. Quote Link to comment Share on other sites More sharing options...
Lucky Joe Posted June 9, 2013 Share Posted June 9, 2013 Alright, I can't help myself... I was so excited about this study when I first ran across it a few years back that I designed a power sluice based solely and exactly and the study's results and conclusions. I remember back when testing the proto-type and watching the water rushing through at 150gpm and thinking: "this is gonna blow out the fine gold". Then I panned the cons and found out the studies were spot on! That water speed really does create the low pressure areas that 'drop' the heavies. The CC690 sells all over the world now with machines shipping to Madagascar (who knew?) and Thailand this week. Anyway, I give the study two big thumbs up! Quote Link to comment Share on other sites More sharing options...
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