关键词: 含碳微细粒金矿, 工艺矿物学, 赋存状态

Abstract: Main valuable mineral of carbonaceous fine-grained gold ore from Qinling area of Shaanxi Province is natural gold and argyrite，gold grade is 5.20×10-6.Chemical composition，mineral composition，occurrence state of were detailedly investigated by optical microscopy，chemical analysis，X-ray diffraction，scanning electron microscopy and energy spectrum analysis to provide technique basis for beneficiation process for the ore.The results showed that the gold mainly exists in form of native gold with fine grain size，the grain size of 0.005~0.01 mm accounts for 83.03%.The content of carbonaceous (organic carbon and graphitic carbon)are high and fine in grain size，and closely intergrowth with gangue minerals such as quartz.Carbonaceous and clay mineral content is high，native gold is finely disseminated，partly native gold particles are wrapped by carbonaceous siliceous slate (the composition of quartz，carbonaceous，limonite and so on)，which results in gold is difficult to be recovered.The study results have guiding significance for beneficiation process setting on the ore，and can provide reference for development and utilization of such type refractory gold ore.

Key words: Carbonaceous fine-grained gold ore, Process mineralogy, Occurrence state