Abstract: Organic material plays an important role in the migration, precipitation, enrichment and mineralization process of metallic elements. Orgnic hydrocarbon, with strong volatility and penetrability, is the final product of organic material splitting. The study for Baguamiao gold deposit reveals that the organic hydrocarbon is positively correlated to the gold grade of ore. The mineralizing center of the deposit coincides with the concentrating center of organic hydrocarbon. This character of organic hydrocarbon may be applied to prognosis for hidden gold deposits.