Yea the math does get a little funky...
Metric Ton = 2000 lbs.
Gold vol. = 1 g/ton
Black Sand vol. = 100 lb/ton
Gold Value = $1400/oz. <---(conservative)
BS Value = $6000/ton <---(conservative)
Daily Material Volume = 1800 tons/day
1 oz. = 31.1 g
***************Daily Volume of Gold*****************
1g/ton * 1800tons/day = 1800g/day of gold.
(1800g/day) * (1 oz/31.1 g) = 57.88 oz. of gold per day
57.88g/day * $1400 = $81,032 gold value per day
**************Daily Volume of Black Sand************
100lb/ton * 1800ton/day = 180,000 lb. Black Sand recovered per day
180,000 / 2000 = 90 metric tons of Black Sand per day.
90ton/day * $6000/ton = $540,000 Black Sand value per day
**************Totals*******************
540,000 + 81,032 = $621,032 daily production value.
I did not verify the constants at the top...simply went off what was originally posted. The math is correct here, now all we have to do is argue the constants...