Platinum assay [Platinum ore composition analysis]

Inspection/Consultation (Wang Li)
Yunnan has complex geological structures and is rich in both metallic and non-metallic minerals. Coal is the most widely distributed non-metallic mineral. Among them, the Paleozoic coal fields are the most important in the Carboniferous and Permian. The Mesozoic coal fields are mainly produced in the Triassic and the Cenozoic coal fields are produced in the Tertiary strata, mainly lignite. The phosphate rock was formed in the Meishucun Formation in the early Cambrian period. Non-metallic minerals such as rock salt, potash, and gypsum were formed in the Mesozoic Era. Metal mines are mainly non-ferrous metal ores, with many types and large reserves. Especially the Gejiu tin mine, Dongchuan copper mine and the titanium mine, which has the largest reserves in the country, are world-famous. They are known as the kingdom of non-ferrous metals and are shaped like Yanshan. Exercise has a greater impact. Iron ore may be formed in early metamorphic rocks, or may be formed in shallow marine sedimentary iron ore in Devonian sandstone.