With the exception of one species, namely, the ores of copper, the region has not proved as attractive in this department as I found the metalliferous surface of Missouri. There are but few traces of mining, and those of an exceedingly ancient character, in the copper region of Lake Superior. The excavations in search of lead ore on the Upper Mississippi do not date back many years, but the indications are such as to show that few countries, even Missouri, exceed them in promises of mineral wealth. I have employed the lapse of time between the termination of the exploration and the present moment, to extend my mineralogical observations to some parts of the Mississippi Valley which were not included in the line of the expedition, but which were visited in the following year, in the service of the Government, namely, the Miami of the Lakes, and Wabash Valleys, the Cave in Rock Region in Lower Illinois, and the Valley of the River Illinois. The whole is concentrated in the following notices:-- _Tabular View of Minerals observed in the Northwest._ I. ORES. _Genera._ _Species._ _Subspecies._ _Varieties._ { Copper { Native copper. { Fibrous. { { Green carbonate of copper { Compact. { Lead Sulphuret of lead Common. { Zinc Sulphuret of zinc Blende. { { { Common. { { { Radiated. METALLIC { { Sulphuret of iron { Spheroidal. MINERALS { { { Cellular. { { { Hepatic. { Iron { Magnetic oxide of iron Iron sand. { { Specular oxide of iron. Micaceous. { { { Ochrey. { { Red oxide of iron { Scaly. { { { Compact. { { Brown oxide of iron Ochrey. { Silver. II. EARTHS AND STONES. _Genus._ _Species._ _Varieties._