Buy it, get it from the Hill giants.
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The easiest place to mine silver is in the Varrock dungeon, south-west of the Grand Exchange. It requires a Brass Key to enter.
Get A Brass Key!
open the dragon chest in Taverley
It is used to open the muddy chest
Hill giants are lvl 28. Many people like to kill htem to get big bones which sell for a decent price. They are found down the ladder in the small house west of varrok. You need a brass key to enter.