| Site of Special Scientific Interest | |
 Disused buildings of Phoenix United Mine | |
  Location within Cornwall  Phoenix United Mine (England) | |
| Location | Cornwall |
|---|---|
| Grid reference | SX266724 |
| Coordinates | 50°31′34″N 4°26′50″W / 50.5261°N 4.4471°W |
| Interest | Biological |
| Area | 29.79 hectares (0.298 km2; 0.115 sq mi) |
| Notification | 1996 |
| Natural England website | |
Phoenix United Mine is a disused 19th century copper and tin mine in Cornwall, England, UK. Heavy metals left over in the soil from the mining operations have allowed mosses and lichens to flourish, and today the site is a Site of Special Scientific Interest (SSSI), noted for its biological characteristics.