The altitude is 1,320 m. The mine pit is typical cambered ceiling and square bottom and is classified as two mine pitsat the top and bottom, extending from north to the east. The upper mine pit is about 3 m high and 2 - 2.5 m wide; the lower mine pit is about 2 m high and 1.8 m wide. The surrounding rock of the ore vein is mainly the issite. The two walls and the ceiling of the mine pit are supported by the wooden brackets. Here, you can see sparkling sheet mica, translucent quartz and milky feldspar, and you can feel the cave scene with a unique lingering charm.