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Different clay samples from Teerayuth Mine, Ban Laeng, Amphoe Muang, Lampang province were analyzed to obtain their mineralogical and chemical characteristics. Each sample was collected from different degree of alteration areas namely low, moderate and high as classified by their physical appearances at the mine faces. The samples were then determined for their geochemical and mineralogical composition. The results show that geochemistry and mineralogy of clays from Teerayuth Mine are varied from place to place. Results of the investigation clearly show the relationship between SiO2 content and the degrees of alteration. A representative sample of low alteration has higher SiO2 content than the high alteration sample. Additionally, illite was found in low alteration sample whereas kaolinite was found in high alteration sample. The alterations are closely related to fracture system, since fractures are commonly present in this area.

Geochemical and Mineralogical Variation Of Hydrothermally Altered Rhyolite At Teerayuth Mine, Ban Laeng, Amphoe Muang, Lampang Province, Thailand