It depends on what you mean by extra metal. All error coins need to be seen for an accurate assessment. Take to a coin dealer.
You have a error coin and the extra metal on it is called a "Curd". This happens when there is a chip in the die. The value depends on the size of the curd and varies from a few cents to a few dollars.
2004 d-wisconsin state with extra leaf
It's a novelty item worth couple of cents for the gold plating plus whatever the underlying quarter is worth. If the quarter is copper-nickel, then it's only worth a quarter. If it's a special silver "prestige" quarter made in San Francisco it's at least worth maybe $3.50 for its metal content.
If you mean broken into pieces, then it is worth nothing but scrap metal.
This coins has no extra value other than 25 cents.
A 1981 U.S. quarter is worth 25 cents. You should have no trouble finding this date and others back to 1965 in common circulation. All are made of copper-nickel clad metal, and none are worth anything special.
What you have is a Standing Liberty quarter, it is worth about $7 in worn condition and coins in better conditions can be worth $20 in fine to extra fine condition and about a hundred dollars in higher grades.
If it's so worn that you can't make out the year, it's only worth its metal content. If it's an old silver coin, it might be worth $2.50 or so as scrap. If it's a modern copper-nickel quarter that is that worn down, it's only worth a quarter.
It's a quarter, the reeding was likely sanded off or filed down, maybe even worn off from use in slot machines.
Firstly, the date probably reads 1876, as that's the year Colorado became a state. At the bottom of the coin, you'll probably see the date 2006, the year the Colorado quarter was minted. It's worth 25 cents.
All state quarters struck for circulation are face value only.
It is worth a quarter :D