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Report on the geological survey of the State of Wisconsin
Report on the geological survey of the State of Wisconsin Author:James Hall Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER VI. ECONOMICAL AND MINING GEOLOGY, Plan And Object Of This Chapter.—Division Into Sections. Section one: General Remarks On The Occurrence Of The M... more »etallic Ores.—Notice Of The Lead-mining Districts Throughout The World.—Statistics, General And Comparative. Section two: Description Of The Various Forms Of Ore Deposit Peculiar To The Lead Region Of The Upper Mississippi.— Sheets.—Openings.—Flat Sheets. Flat Openings.—Arrangement Of The Ore In The Openings.—Section Of The Openings In The Blue LimeStone. Section three: Special Description Of The Diggings In WisconSin.—Special Remarks On Copper Mining In The Lead Region :—on Zinc Mining And Smelting. Section four: Theoretical Considerations On The Mode Of Occurrence Of The Ore In The Lead Region : Surface ArrangeMent Of The Crevices :—How Formed :—How Filled With Ore And Other Materials Now Found In Them. Section Jive: Practical Considerations :— Possibility Of Deep Mining In The Lead Region.—Mining In The Lower Magnesian.—How The Present System May Be Improved. In this chapter will be embraced all that relates to the mode of occurrence of the metalliferous ores and other economically valuable mineral substances which occur in the Lead Region. Having in the preceding divisions of this Report set forth with sufficient detail the character of the different stratified masses which underlie the district in question, and described the accidental minerals which occur in them from the strictly mineralogical point of view, we are now prepared to take up such of these minerals as exist in sufficient quantity and are of such a nature as to be, either actually or possibly, of practical importance, and to consider them as the objects of mining enterprise. In this connection, weshall endeavor to set forth all the facts necessary to ...« less