Introduction to Copper Coin Square: The world's largest copper coin "Kaiyuan Tongbao" is 24 meters in diameter and 3.8 meters thick, reflecting the rich history of Baoshan Copper Mine.
Introduction to Copper Coin Square: The world's largest copper coin "Kaiyuan Tongbao" is 24 meters in diameter and 3.8 meters thick, reflecting the rich history of Baoshan Copper Mine.