When did they make a Gold dime?

Silver dimes and quarters were minted from 1796 to 1964. Most of them were made of 90% silver and 10% copper.

For other denominations, halves were silver from 1794 to 1970, but those dated 1965-1970 were made of 40% silver, not 90% silver.

Silver dollars were made of 90% silver up till 1935.

Contrary to many misunderstandings, most nickels were never made of silver - only the famous "war nickels" struck during WWII contained silver, and only 35%.