【Haichuan Chemical Industry Site】The nitrate production site from the Song Dynasty at Jinfoshan in Nanchuan
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Inside the Golden Buddha Cave, a faint sulfur-like smell fills the air, and the cave walls as well as the soil on the ground are grayish-black in color. In the Golden Buddha Hall, a row of cooking stoves is arranged in a line, with dried-up ponds of various sizes beside them. “It has been darkened over time by heating nitre with coal inside the cave. ”Zhang Qinwei said, “As early as over 700 years ago, during the Southern Song Dynasty, people spent long periods of time in Jinfodong boiling nitrate using charcoal fires, and then transporting it out of the mountain to be used in the production of **.” ” Historical records show that in 1259, the Mongol army reached Longyan City near Nanchuan. The local troops and civilians fought against the Mongols for 18 years; the Mongols were defeated, and Longyan City came to be known as the \"Invincible City\".
In Jinfo Cave of Jinfoshan in Nanchuan District, there is a secret passage that leads directly to Longyan City, known as the Invincible City. More than 700 years ago, the Mongol army invaded Sichuan, and the Song and Mongol forces clashed in Longyan City for 18 years, with the Mongols ultimately suffering defeat. This secret passage served as a route for transporting materials such as gunpowder from Jinfo Cave to Longyan City.
Zhang Qinwei explained that at that time, the expedition team discovered a type of stone bomb in the cave – stones that were carved out to be hollow and filled with black **. “This was very similar to modern shells, and it played a crucial role in the confrontation at Longyan City. ” “The Jinfoshan caves are the largest nitre-purification site discovered to date, acting as a natural chemical plant. ”Zhang Qinwei said that the most recent nitre boiling activity in Jinfo Cave took place in 1958. At that time, Nanchuan was building roads, and the local people processed nitre in the Jinfo Cave before transporting it out of the mountain to make **.