Abstract

• Taung Ni area is situated in Madaya Township, Mandalay Region, Myanmar. The mineralization style of the study area is the vein type deposit hosted by quartzite jointed and brecciated interbedded with phyllite. Two main types of quartz veins were observed within the Taung Ni goldbearing quartz veins system: primary gold-bearing sulphide quartz veins and secondary auriferous deformed / remobilized quartz veins. The quartz veins have generally segmented structure with typically brecciated and laminated/banded textures. Mineralogically quartz dominates in all the mineralized veins and a variety of textures, such as massive quartz, comb quartz, mosaic textures quartz, sheared quartz, and mechanical breakdown of quartz are present. Three generations of quartz based on morphology have been identified: the coarse-grained quartz (first quartz generation), finegrained to ribbon quartz due to recrystallization (second quartz generation), and sheared and comb structure quartz (third quartz generation). The distinct alteration processes are silicification, chloritization, sericitization, pyritization and hematization. Gold- bearing sulphide quartz veins show a stockwork structure with chalcopyrite filled fractures. Gold occurs as inclusions in chalcopyrite and hematite. Auriferous deformed/remobilized quartz veins show the crushed and fractured characteristics with hematite filled fractures. The hematite quartz bands offer the best potential for significant gold concentration. Fluid inclusion data indicated that the gold-bearing mineralized quartz veins were developed within mesothermal environment. On the basic of those discovered genetic characteristics, quartz veins and textures of quartz, the Taung Ni gold prospect is a orogenic (mesothermal) gold type.