
Based on the provided information, a silver dollar is composed of 90 percent silver and 10 percent copper. This metallic composition was standard for silver currency produced by the United States Mint during that period.
The total mass of a Morgan dollar is 26.73 grams, which is equivalent to 0.859 troy ounces. Given its 90 percent purity, the actual silver content, or the net weight of the pure silver within the coin, is 0.77344 troy ounces (24.057 grams). The remaining mass is the copper alloy, which was included to increase the coin's durability for circulation. These specifications apply to the Morgan dollars minted from 1878 to 1904 and again in 1921.


