The value of an 1879 silver dollar depends on a number of factors, including its condition and rarity. In general, an 1879 silver dollar in good condition can be worth anywhere from $20 to $50. However, some rare 1879 silver dollars can be worth much more. For example, an 1879 silver dollar with a "CC" mint mark (indicating that it was minted in Carson City, Nevada) can be worth upwards of $100. Ultimately, the best way to determine the value of an 1879 silver dollar is to have it appraised by a professional numismatist.