The 1018 is the most efficient Commercial Sized Fine Gold Highbanker on the. market. If you can keep up, the 1018 will accurately process material volumes. of more than 15 Gallons Per Minute This is equivalent to 7.5 Tons. Per Hour of raw material. Use it alone, bring Apr 11, 2017 Im thinking that if youre getting 100- or finer gold, dont go above 1/2 inch down from the top. Coarser material can have more material put in the bowl. 100-, only about a rounded tablespoon full. Hope this all helps. Google the blue bowl and youll probably find a vendor with the full instructions online.