Found this 1996 P dime in a bank coin roll with some extra nickel( apparently ) metal pieces on the left olive branch,bottom, on top of the U on( E PLU ) and between the next branch and the stem and DDR on the letters US-UNUM
There is only the same amount of metal. When the coin is struck, it copies what is on the die. No extra metal is added. (Just an incuse mark on the die, leaving a raised area in the coin) The only time there is extra metal is when part of the die, or something extra in the chamber adds it to the coin during the strike. Most often it falls off of the coin, and leaves an incuse area on the coin where it fell off of the coin. Same weight in on the planchet, same weight out on the coin.