The value of an 1891 silver dollar depends on a number of factors, including the coin's condition, rarity, and overall desirability. In general, an 1891 silver dollar in good condition can be worth anywhere from $20 to $30. However, some 1891 silver dollars may be worth significantly more, depending on the specific variety or mint mark. For example, an 1891-CC silver dollar, which was minted in Carson City, Nevada, can be worth up to $100 or more. If you have an 1891 silver dollar, it is best to have it professionally appraised to determine its exact value.