Geology and Gold Mineralization of the Yamethin Area, Yamethin Township, Mandalay Region

The research area is situated about 8 miles (12.87 km) east of Yamethin and it occupies the
western marginal zone of the Shan Plateau, covering about 24 square miles (62.2 km2). The area
is mainly composed of metasedimentary rocks and granites. The metasedimentary rocks include
metamorphosed Lower Paleozoic rocks and they are intruded by two types of granite;
porphyritic and non-prophyritic biotite granite. The Lebyin Group consists of mudstone, pebbly
graywacke and slate unit and exposed in the eastern and northeastern part of the area. The
metamorphosed Lower Paleozoic rocks consist of three rock units: M1 (calc silicate rocks,
marble and skarn), M2 (Metagraywacke and phyllite), and M3 (mica schists, quartzite and
gneisses). The granites are of two types; porphyritic biotite granite and biotite granite. The
radiometric dating on granites emplacement is possibly Cretaceous to Early Eocene. Gold and
pyrite bearing quartz veins are encountered in slate and mudstone units of Lebyin Group.