DISCUSSIONS THE FORM.4TION OF SEDIMENTARY IRON MINER.4LS

origin of sedimentary iron ores. The last decade has yielded much data on the origin of oolitic iron ores, by such researchers as Harder (1957), Strakhov (1957) and Lombard (1956), which has given rise to a fuller understanding of the genesis of these ores. Based on research carried out by the IRSID (In-stitut de Recherches de la Sid6rurgie) on the Lorraine (France) iron ore deposit (which was always con-sidered as the type of minette iron ore) a complete genetic model has been drawn up showing distribu-tion of mineralization, structures, textures, para-genesis, and above all, the chemical breakdown of the various types of ores. One of the most important aims of this researc