The official composition of U.S. silver coinage, determined by the Mint Act of 1792. Initially set at approximately 89 percent silver and 11 percent copper, it was later changed to 90 percent silver and 10 percent copper.
The official composition of U.S. silver coinage, determined by the Mint Act of 1792. Initially set at approximately 89 percent silver and 11 percent copper, it was later changed to 90 percent silver and 10 percent copper.