As of 1925 hours on 20 Sept 2007:
Copper - $3.5813/lb.
Nickel - $14.6579/lb.
Platinum - $1323.00/troy oz.
Gold - $733.50/troy oz.
Silver - $13.33/troy oz.
1 Troy ounce is equal to 1.097 Avoirdupois ounce. So to answer your question:
The price of 55.03 one troy ounce silver coins is equal to the price of one troy ounce gold coin.
One troy ounce of copper is worth $.2455, so 54.29 troy ounces of copper is equal to one troy ounce of silver.
Some web sites to help you with these facts and figures:
Kitco Base Metals Kitco Gold Precious Metals Mass and Weight conversion online