180 grams should translate to a few ounces, meaning you should WAY more than quadrouple your investment.
180/28= 6.4 ounces. unless gold ounces are measured differently, you should make 4 grand easy, just on the 180 grams of gold.
-edit-
even if its measured in troy ounces at the place you sell it at, you should easily clear 4 grand, just on the gold alone.
great score!