2 resultados para Indiana. Dept. of Geology and Natural History
em Digital Commons - Montana Tech
Resumo:
The Ruby Gulch Mine, owned and operated by the Ruby Gulch Mining Company, Zortman, Montana, is one of the most important low-grade gold producers in the state. Situated in the Little Rocky Mountains, the mine has had an interesting history since its discovery shortly before the turn of the century.
Resumo:
Pennsylvanian strata in Wyoming and adjacent areas have been the subject of much work and discussion. Most of the work has been due to the economic importance of the system as an oil producer in this region. Oil production from strata of Pennsylvanian age is rather recent history; and therefore, much of the available information is localized and incomplete.