I am not disputing your figures Charlie, honest friend!
Maybe I am explaining it wrong?
The assay value shows 170g/t but that does not mean that a whole ton was collected in just 2 hours. The test sample may have been 10 pounds for all we know. It is a chemical analysis of a sample we submitted.
The assayer would be unlikely to test a whole ton of concentrate. He can do the test with a tiny sample. I just want to figure out how many hours it takes a dredge to produce a ton of concentrate. A 50TPH dredge moves that much gravel but most just flows through the sluice box and back into the water. Only the heavier gold falls into the riffles to be collected.