Abstract: A BIF iron deposit newly discovered in the Neoproterozoic stratum of Eastern Sudan is an Algoma type iron deposit having close connection with volcanic rocks. The ore grade is TFe37.78%. This is referential for further studies into the forming age and paleogeographic setting of the Nubian Shield. The ferriferous quartz sandstone found in Block 79 occurs NE in a zonal matrix andoverlies the Nubian Shield with an angular unconformity. Comparison with the CID iron deposits in Western Australia,there is obvious characteristics of redeposition like cross-bedding and basal conglomerateand the ore grade is TFe31.91%~39.33%. Comparative analysis of partial element and oxide contents in BIF iron ores, CID iron ores and the Nubian greywacke and investigation of the ore-controlling factors discovered that the CID iron ores are products of weathered or denudated BIF iron ores that were transported to and then deposited in the nearby paleochannels. The discovery of CID iron ores in the Nubian Shield area of Sudan offers a new target for future prospecting efforts and has very important prospecting significance.