...their "range." The ore bodies are sometimes continuous for long distances along these "ranges," which for that reason largely control the prospecting, both...limestone, both of Ordovician age. The ores are galena, smithsonite, and sphalerite, though the two latter are much less common now than formerly, when the...

...mines of northern Illinois are all in Jo Daviess County, the extreme northwest county of the State. The ore deposits occur in the Galena dolomite and...the Platteville limestone, both of Ordovician age. They are galena, smithsonite, and sphalerite, though the two latter are much less common now than formerly,...

...long distances along these "ranges," which for that reason largely control the prospecting, both r>y shafts and by drilling. The ore deposits occur in the Galena dolomite and hi the upper part of the Platteville limestone, both of Ordovician age. The ores are galena, smithsonite,...

...counties, and comprise the most important part of the ore deposits of the upper Mississippi Valley region. The ore deposits occur in the Galena dolomite and in the upper part of the Platteville 97M7°— MB 1909, PT 1 34 Ore. Metal content. District. Lead concentrates. Zinc concentrates. Lead....

...counties and comprise the most important part of the ore deposits of the upper Mississippi Valley region. The ore deposits occur in the galena dolomite and...of Ordovician age. The ores are galena, sphalerite District. Lead concentrates. Ore. Zinc concentrates. Metal content. Cuba City-Elmo. Dodgevifle Hazel...

...long distances along these "ranges," which for that reason largely control the prospecting, both Ъу shafts and by drilling. The ore deposits occur in the Galena dolomite and in the upper part of the Plattevillo limestone, both of Ordovician age. The ores are galena, smithsonite, and sphalerite, though...

...long distances along these "ranges," which for that reason largely control the prospecting, bothby shafts and by drilling. The ore deposits occur in...Platteville limestone, both of Ordovician age. The ores aro galena, smithsonito, and sphalerite, though the two latter are much less common now than formerly,...

...long distances along these "ranges," which for that reason largely control the prospecting, botnby shafts and by drilling. The ore deposits occur in...limestone, both of Ordovician age. The ores are galena, smithsonite, and sphalerite, though the two latter are much less common now than formerly, when the...

...have been given in the reports in Mineral Resources of the United States for the years 1907 to 1915. The ore deposits occur in the Galena dolomite and in the upper part of the Plattcville limestone, both of Ordovician age. The ores are galena, sphalerite or zinc blende, with...

...mines of northern Illinois are all in Jo Daviess County, the extreme northwest county of the State. The ore deposits occur in the Galena dolomite and...the Platteville limestone, both of Ordovician age. They are galena, smithsonite, and sphalerite, though the two latter are much less common now than formerly,...