An Investigation of the Ores of the Big Seven Mine, Neihart, Montana

During the course of this investigation of the ores of the Big Seven mine, Neihart, Montana, the writer has attempted, through a mi­croscopic study of polished sections, to ascertain the hypogene or supergene character of the ore minerals present in the ore suite.

Vermiculite, Occurence, Character, and Concentration of Mineral from the Pony District, Madison County, Montana

The purpose of this paper is to investigate the occurrence and character of the vermiculite deposits approximately four miles northwest of Pony; Madison County, Montana. The deposits are situated in rolling foothills at the northern end of the Tobacco Root Mountains.