Most 1861 dimes are made of 90% silver, with a small percentage of copper. They weigh 2.49 grams, and are 17.9 mm in diameter.
The 1861 dime is a fairly common coin, and in Good Condition, it is worth around $1.50. However, in Uncirculated condition, the 1861 dime can be worth up to $100 or more.
Some 1861 dimes are more valuable than others. For example, the 1861-O dime, which was minted in New Orleans, is considered to be a rare coin, and can be worth up to $1,000 or more in Uncirculated condition.
If you have an 1861 dime, it is important to have it authenticated and graded by a professional coin grader to determine its exact value.