a silver mine的用法和样例：
- While in that service he had discovered a silver mine in the mountains of Thessaly, but he had been careful to conceal it from every one.
- She wore a silver chain around her neck.
- Tombstone became a historic landmark as an example of a silver mining town, and it has important physical remains built after the 1881 gunfight.
- She won a silver trophy for shooting.
- She was born with a silver spoon in her mouth.
- There is not a silver hair on her head.