16 ounces to a standard pound (giving you extra)

2000 pounds to a ton.

32 thousand ounces to a ton.

32 thousand (amount of ounces) times 80 (amount of tons) = two million five hundred sixty thousand (ounces).

Two million five hundred sixty thousand ounces times (US$ 645.00) = 1.6512 billion U.S. dollars (today's rate of $645.00)