...special facilities for saving the lead and zinc both by jigs and by tables. IOWA. -- By JP DUNLOP. The lead and zinc deposits of Iowa extend along Mississippi...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. The ore deposits of the Dubuque district occur in crevices and in caves or " openings...

...stated. The total zinc production of the State was a very small part of the total output of the region. In early days the Dubuque mines were the most important...within the last few years has there been much attempt to mine below water level. Therefore the production, particularly of zinc-blende ore for these years,...

...and zinc deposits of Iowa extend along ^lississippi River for nearly 80 miles in Dubuque. Chvyton, and Allamakee counties. They are found in the Galena...earlier mining was done above water level, and only witliin the last few years has there been much attempt Ore. Metal content. I.ead concentrates. Zinc...

...1910 was practically all from the Avenue Top mine. The output of other concentrates for both years was made up of small lots obtained as the result of...within the last few years has there been much attempt to mine below water level. Therefore the production, particularly of zinc-blende ore for these years,...

...stated. The total zinc production of the State was a very small part of the total output of the region. In early days the Dubuque mines were the most important...considerable quantities of zinc carbonate ore. Nearly aU this earlier mining was done above water level, and only within the last few years has there been...

...Allamakcc counties. They are found in the galena dolomite, of Ordovician age. In early days the Dumique mines were the most important source of lead in the...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. Nearljr all this earlier mining was done above water level, and only within the...

...nearly 80 miles, in Dubuque, Clayton, and Alamakee counties. They are found in the Galena dolom'te, of Ordovician age. In early days the Dubuque mines...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. Nearly all this earlier mining was done above water level, and only within the...

...and by tables. IOWA. By JP DUNLOP. The lead and zinc deposits of Iowa extend along Mississippi Eiver for nearly 80 miles, in Dubuque, Clayton, and Allamakee...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. The ore deposits of the Dubuque district occur in crevices and in caves or "openings"...

...deposits of Iowa extend along Mississippi River for nearly 80 miles, in Dubuque, Clayton, and Allamakce counties. They are found in the Galena dolomite, of...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. Nearly all this earlier mining was done above water level, and only within the...

...day and is provided with special facilities for saving the lead and zinc both by jigs and by tables. IOWA. The lead and zinc deposits of Iowa extend along...vicinity of Durango, yielded considerable quantities of zinc-carbonate ore. The ore deposits of the Dubuque district occur in crevices and in caves or " openings...