One of the most popular coins to collect are Morgan Silver dollars. These coins were minted from 1878 to 1904 and again for one more year in 1921. Morgan Silver dollars from Carson City remain popular among Morgan dollars, due to their low mintage. 

Brief History

The Comstock Lode, one of the greatest silver strikes in history, was discovered in Nevada in the late 1850s. The strike put downward pressure on silver prices worldwide. In 1878 Congress passed the Bland-Allison Act which required the Treasury Department to purchase large amounts of silver, and to strike it as coins. For reasons of economy, the Treasury chose to strike the silver as dollars.

When the dollar was minted in 1878, it was the first dollar issued for American commercial use since the last Seated Liberty Dollar of 1873. The Trade Dollar was minted during this time period but was intended to be used for trade in the Orient. The dollar was continuously minted until 1904 when the supply of dollars in circulation was high and there was an absence of silver bullion. Then in 1918, the Pittman Act called for over 270 million coins to be melted for silver content. In 1921, the coinage of the Morgan Dollar resumed for that year and was replaced by the Peace Dollar commemorative that would become standard issue. Since 1921, many Morgan Dollars have been melted. Melting has mostly occurred when silver prices escalated because these dollars yield silver bullion.

Caches of Morgan Dollars produced at the Carson City Mint were discovered and were sold to coin collectors by the federal government in the early 1950s. Many of these dollars were uncirculated and are called GSAs (named after the General Services Administration) and come in black plastic holders that mimic the holders used for proof silver Eisenhower dollars of the period. These have become collectible items within the GSA encapsulation.

Mintages:

Source: Wikipedia