. [Reports]. faces. The various structures have been noted and the relation ofthese to the ore has been faithfully represented in the many draw-ings inserted herein. The facts from which our conclusions aredrawn are well illustrated in this report, but it is impossible toexpress the effect which repeated observations of these facts hashad upon these conclusions. The three important factors involvedin the introduction and precipitation of the lead are unquestion-ably the ground-water, the jointing and faulting, and the composi-tion of the sediments. To these frequent reference is made in therep
. [Reports]. faces. The various structures have been noted and the relation ofthese to the ore has been faithfully represented in the many draw-ings inserted herein. The facts from which our conclusions aredrawn are well illustrated in this report, but it is impossible toexpress the effect which repeated observations of these facts hashad upon these conclusions. The three important factors involvedin the introduction and precipitation of the lead are unquestion-ably the ground-water, the jointing and faulting, and the composi-tion of the sediments. To these frequent reference is made in thereport. In the descriptions of the mines there is probably consider-able seemingly unnecessary repetition. However, to the author, ithas been the repeated observation of such facts that has led to theconclusions contained herein. The story has not all been told in these pages, but it is hopedthat something may have been added to our knowledge of one ofthe most important deposits of lead ore in the United CHAPTER I. LOCATION, HISTORY, PRODUCTION AND PHYSIOGRAPHY. LOCATION. In the earlier reports of the Missouri Bureau of Geology andMines, there has been included in the southeastern district, thefollowing counties,—Perry, Ste. Genevieve, St. Francois, Washing-ton, Franklin and Jefferson; the northern portions of Cape Girar-deau, Bollinger, Madison, Iron and Reynolds, and the eastern por-tion of Crawford.* The boundary lines of this district were drawnarbitrarily and were intended simply to include that portion ofsoutheastern Missouri which contains noteworthy deposits of leadand zinc ores. In the report referred to above, this district wasdivided into sub-districts. For convenience of description, as wellas because of certain differences in the deposits, the following sub-districts were recognized: (1) The St. Francois and Madison county sub-district. (2) The Washington county sub-district. (3) The Franklin county sub-district. The present report deals with a portion of w
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