Jaime Hernandez: On June of 1999, the U.S. Mint test struck 39 Proof Sacagawea Dollars on 22kt gold planchets. These gold planchets were 27 mm thick and were composed of .9167 fine gold. These are the same planchets currently used to strike $25 Uncirculated Gold Eagles.
The 2000-W Sacagawea 22kt Gold Dollars were struck at the Philadelphia Mint.
However, the coins carry a W mint mark instead of a P mint mark, or no mint mark at all, since the coins were originally intended to be struck at the West Point Mint, located in New York. The Mint's original plan was to sell the 22kt Gold Sacagawea Dollars to the public. However, that idea was eventually quashed. Instead of melting all 39 coins, the Mint chose the 12 best-looking examples for future displaying purposes and melted the remaining 27 coins.
The 12 surviving examples were later sent 1.8 million miles into outer space aboard the Space Shuttle Columbia to commemorate Eileen Collin as the first female U.S. astronaut to be a commander on a space shuttle flight. On August 31, 2001, the 12 coins were then transported to Fort Knox for safe keeping. On August 10, 2007 the coins were briefly removed from Fort Knox to be displayed at the American Numismatic Association's World Fair of Money in Milwaukee, Wisconsin.
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