The area around the mountain village of Tian Xing seems to have an incredible assortment of caves. It has the four deepest cave systems in China and “numerous 200m+ vertical shafts” including the 501m Miao Keng shaft.
The Miao Keng shaft near Tian Xing in China is the deepest natural shaft in the world. In fact, spelunkers found that it took those over two hours to descend into the shaft, which has a depth of 1,026 meters. Located in China’s Chongqing province, cave enthusiasts camped at the base of the shaft for four or five days to get a better understanding of the ecosystem underground.
While the Miao Keng is a naturally-occurring shaft, the Mponeng Gold Mine in South Africa is the deepest mine shaft in the world. Its depth measures an astounding 4km. Clearly, people go to great depths to extract every bit of gold they can find.
According to internet