Youfangxi-Erbahuo area is situated in Late Hercynian Nanxingan geosynclinal fold belt and developed with Mesozoic volcanics, strong Yanshanian intermediate-acid magrnatism and a series of volcanic-subvocanic hydrothermal Ag polymetal ore deposits.

• 摘要内蒙油房一二把伙地区位于华北地台北缘南兴安晚华力西期地槽褶皱带，中生代火山岩系发育，燕山期中酸性岩浆活动强烈，形成了一系列火山、潜火山热液型银多金属矿床。