Zero. The fact it is a "miniature" should tip you off that it isn't a real US mint product. As such, it is most likely just gold plated and costs more to remove the plating than what the gold content is worth. As it isn't a US mint product it also has no collector value.
The coin is a Sacagawea dollar.
Yes Sacajawea is on a dollar coin
It depends on if it's made of gold or just gold plated. It has no value as a coin. Take it to a jewler. Most buy scrap gold & silver.
One dollar.
The 1929 $5 gold coin, also known as the Indian Head or Indian Eagle, contains 0.24187 troy ounces of gold. This weight corresponds to the coin's gold content, as it was minted in 90% gold and 10% copper. The total weight of the coin is 8.359 grams.
the value varies based on condition of coin and demand by collectors. Go to your local coin shop to get a rough ballpark figure.
The 1851 Indian Head dollar is a well known novelty piece, so a real coin does not exist.
Sacagawea
The coin you are referring to is a US $1 gold coin, commonly known as the Indian Head or Indian Princess gold dollar. These coins were minted between 1849 and 1889 and feature an image of Liberty as an Indian woman on the obverse side and a representation of a bald eagle on the reverse side.
0.018 in the us dollar currency.
0.48375 troy ounces (in a real gold dollar from the 1850s)
The Sacagawea Golden Dollar Coin