508 pounds in 491 hours
Whatever time period that 491 hours was spread out over, what matters is
1) the rate per hour
and
2) the grades
For those who witnessed the mill in action, did it look like they were producing about one pound per hour? If you assume concentrate is 10% gold (that's low, isn't it?), then one pound would be about 1/2 cup....
Hard work often pays off over time,
but laziness always pays off right now.