. [Reports]. two or three epochs in the development of this in-dustry. An excellent summary of the history of lead and zincmining in Missouri is given by Arthur Winslow in Chapter VII,Volume VI of the earlier reports of this Bureau. The most important discovery in the Southeastern Missouridistrict was that of the deposits of disseminated lead which arenow being so extensively exploited in the Bonne Terre, Flat Riverand Leadwood areas. The discovery of disseminated ore was madeon the property now owned by the St. Joseph Lead Company, atBonne Terre, in the year 1864. The most important step in t
. [Reports]. two or three epochs in the development of this in-dustry. An excellent summary of the history of lead and zincmining in Missouri is given by Arthur Winslow in Chapter VII,Volume VI of the earlier reports of this Bureau. The most important discovery in the Southeastern Missouridistrict was that of the deposits of disseminated lead which arenow being so extensively exploited in the Bonne Terre, Flat Riverand Leadwood areas. The discovery of disseminated ore was madeon the property now owned by the St. Joseph Lead Company, atBonne Terre, in the year 1864. The most important step in thedevelopment of the disseminated lead deposits of this district wasthe introduction, by the St. Joseph Lead Company, of the diamonddrill in 1869. Prior to the year 1869, nearly all of the lead ore ob-tained in the district was mined from shallow workings, and oc-curred chiefly in masses or crystal aggregates in crevices, caves *L?ad and ^inc Deposits, Vol. VII, Mo. Geo!. Survey, by Arthur Winslow, page PHYSIOGRAPHY. 3 and caverns in the limestone and chiefly above the level of groundwater. The lead ore production of St. Francois county up to 1869,has been estimated by Winslow at 59,526 tons valued at approxi-mately $1,984,900. During the same period in Washington county,the output amounted to 124,930 short tons of ore valued at $5,-082,700. Since 1869, the output of St. Francois has increasedenormously. The period from 1869 to 1906, inclusive, shows a pro-duction of 1,202, sh. tons of lead concentrates valued at $59,-869,354.* During this same period, the production in Washingtoncounty has decreased. The enormous increase in the production of St. Francoiscounty is attributable to the extensive development of the bodies ofdisseminated lead ore which occur in the Bonne Terre county is underlain at the surface, chiefly with thehighly siliceous Potosi formation in which disseminated depositsare not known to occur. About 275 to 300 feet below the bas
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