Ok here is how i came up with a valuation. Please feel free to point out any flaws.
If a dredge can do 55 tons/hr. of gravel and 100 lbs per ton is black sand. Then that = 2.5 tons of black sand /hr. Black sand being worth $8400/ ton. Then 1 dredge would reap $21,000/ hr.
x 3 dredges = $63,000/ hr. x 40 hrs a week x 52 weeks = $131,040,000/ yr. revenues.
I don;t know what the profit margin is but lets say its 40%. Then profit = $52M/ yr.
Divide by 1.3B O/S to get and EPS of $.04 x a nominal PE ratio of 10 and you get a PPS of $.40
If we get 24 dredges going we are talking $3.20!!!