Abstract: In order better to carry out beneficiation tests with a oxide copper ore from Yunnan Province，the research on process mineralogy was investigated with the representative ore.Research indicates：①The copper grade is 0.75%，the oxidation rate of 92.00%，the silver grade is 23.20 g/t，the main copper minerals are malachite(azurite)，Cu-bearing limonite，pseudomalachite，the main gangue minerals are quartz and muscovite.②The protolith is comprised of quartzite breccias，cuttings breccia，lithic quartz sandstone,etc.，sparse disseminated structure and vein structure are mainly structure，intersertal texture，metasomatic texture，poikilitic texture，brecciated texture，palimpsest texture，fine granular blastic texture are mainly texture.③The particle size of malachite(azurite) in the range of 1.2~212 μm，(mainly in 9.6~106 μm，accounted for 69.39%)，Cu-bearing limonite in the range of 1.75~150 μm,( mainly in 4.8~38 μm，accounted for 58.43%)，pseudomalachite in the range of 1.75~106 μm,( mainly in 53~106 μm，9.6~19 μm，accounted for 81.39%).④Quartz，muscovite，kaolinite ect.closely symbiosis with the copper，which often confounding with each other.According to the process mineralogy research result，it is estimated that good indicators would not get by flotation process，and leaching process may be more reasonable to recover the copper.

Key words: Malachite, Azurite, Pseudomalachite, Cu-bearing limonite, Quartz, High oxidation rate, Dissemination size