The deposit No. 320 is a palaeokarst deposit resulted from the silicification and reworking which is same as the silicified solution-collapse breccia pipe in Arizona,USA.

• 320矿床是一个硅化改造的古岩溶矿床,它与美国亚利桑那州的硅化溶解-塌陷角砾岩筒相同。