USABuffaloGold.com is a fore-runner on the internet with information on the U.S. mint Gold Buffalo program. They scour the internet for news and related information, then centrally locate that information for you to enjoy FREE. The following is an excerpt from their website that explains the beginning of the Buffalo Gold craze:

In 2005, Congress passed the Presidential One Dollar Coin Act of 2005, which authorized the production of a gold coin made of .9999 fine--pure 24kt.--gold, as opposed to the .9167 fine--22kt.--gold used in the American Gold Eagle coins. 22kt. gold, which is alloyed with copper and/or silver, is used because the additional metals make the coins harder, thus less prone to scuffs and more stable when struck.

When the original 2006 Buffalo Gold coin was released, Rick Montgomery, Vice President and Grading Finalizer at NGC, said of these new coins, "With the introduction of the pure gold 1 oz. Buffalo $50 coin, numismatists everywhere have renewed their love of Americana while being able to fully appreciate the original design of James Fraser. The pure gold Buffalo $50 will be treasured and enjoyed by collectors for years to come."