What does DWT mean referring to gold?

Here is this for now, bit of importance missing, will find and get back:
Jewelry Sector - Conversion Tables (http://www.kitco.com/jewelry/dwt-oz-gram.html)
Conversion Factors - Density, Mass Concentration (http://ceramicsandminerals.com/cvdensit.html)

Then check out page 23 here for gold being measured in Troy Ounces, 12 to a pound:
The practical arithmetic - Google Book Search (http://books.google.com/books?id=8dwDAAAAQAAJ&pg=PA23&lpg=PA23&dq=avourdupois+gold&source=web&ots=ZqiCCCHT6c&sig=Y5P-zZfKYY1whtinR7hC40k353Y)