How many silver coins are needed to make 1 oz of silver depends on how big the coins are and what kind of metal was used to make them. For example, 14 dimes from the years 1875 to 1964 are needed to make 1 oz of silver.
Between 1875 and 1964, dimes had a weight of 2.50 grammes and were made of 90% silver and 10% copper. Between 1921 and 1935, 90%, or.7735 oz, of each peace dollar was made from silver. Two of these peace dollars would be worth more than one ounce of silver. Most silver coins aren’t made of 100% silver, so estimates will be different from one coin to the next.