Abstract: Siguiri Gold Deposit is located in northeast of Guinea,and at the intersection of regional NWW and near SN fault structures.Based on the research of geological background and deposit geology characteristics,ore-controlling factors are analyzed.The orebodies,which occur as vein and tabular shapes,are hosted in the weakly metamorphosed Paleoproterozoic Birimian series.Wall rock alterations are mainly composed of silicification,carbonation,chloritization,albitization and so on,in which silicification and carbonation are closely associated with gold mineralization.Gold mineralization is mainly found in coarse-grained clastic rocks of Fatoya Formation.Magmatism may provide both heat and part of the material sources for ore-forming.Orebodies are controlled by secondary faults formed during the compression-extension transition period of the late Eburnean Orogeny.Fault is the most important ore-controlling factor.