Abstract:

 Maheiga gold mine is a concealed BIF gold deposit，which is produced in the contact zone of upper and lower sections of the Nyanzian group in Archaean Kahama greenstone belt of the Tanzania Craton，and controlled by interlaminar shear zone.Folds in the region are developed，and the magmatic activities were strong.Silicification，chlorite，pyritized and limonitization have close relationship with gold ore.The deposit can be divided into three periods and five mineralization stages.The main mineralization stage is natural gold-quartz-polymetallic sulphides stage.Mineral enriched in magnetite quartzite and gold ore，the magnetic susceptibility of which （up to 342×10-3~1 477×10-3 SI） has a significant difference with the background rocks（only 0.16×10-3~1.26×10-3 SI），the background rocks are tuffaceous sandstone，metamorphic tuff，chlorite phyllite.Apparent  chargeability of banded iron formation，gold ore iron formation and tuffaceous sandstone are 8.66×10-2，2.18×10-2and 0.48×10-2；apparent resistivity of them are 220，280 and 380 Ω·m.The former has obvious physical characteristics of relatively“low resistance and high polarization”.The main geochemical anomaly element combination is Au，As，Sb，Ag，Hg and Ba.The order of concentration Clark of elements in ore is Au-As-Sb-W-Pb-B-Ag-Zn-Sn-Mo-Bi-Cu-Cr-Hg.Au，As，Sb in the banded magnetite-quartzite enriched obviously，this is consistent with the characteristics that the favorable metallogenic layers banded magnetite quartzite.They are indicator elements for seeking deep gold blind orebodies.We brought forward the exploration criteria of BIF-type gold deposits， according to above characteristics of BIF.

Key words: banded iron formation gold deposits, exploration criteria, Archaean greenstone belt, Maheiga gold deposit, Tanzania