. [Reports]. at this horizon. Someof the galena individuals are leached and certain zones in the rockgive unmistakable evidence of decomposition since the introduc-tion of the galena. In part, this is the reason for the lighter colorof the rock, which is characteristic of this horizon. There is verylittle chlorite. Some calcite occurs with the thin sheets of galenaalong the bedding planes. There are very few sharp, clean cutveins of galena and calcite, most of the veins of galena being irregu-lar and rather difficult to follow. In spite of the general light color of the rock the ore occurschie
. [Reports]. at this horizon. Someof the galena individuals are leached and certain zones in the rockgive unmistakable evidence of decomposition since the introduc-tion of the galena. In part, this is the reason for the lighter colorof the rock, which is characteristic of this horizon. There is verylittle chlorite. Some calcite occurs with the thin sheets of galenaalong the bedding planes. There are very few sharp, clean cutveins of galena and calcite, most of the veins of galena being irregu-lar and rather difficult to follow. In spite of the general light color of the rock the ore occurschiefly in the brown dolomite and along bedding planes associatedwith thin laminae of black shale. The disseminated ore is chieflyin coarsely crystalline dolomite. In general the ore is of the bunchytype, the rich areas occurring irregularly through a generally leanhorizon. ST. JOSEPH LEAD CO. The St. Joseph Lead Company was organized in 1864 and be-gan mining operations at Bonne Terre in 1865. The original tract. ST. JOSEPH LEAD CO. 141 of land owned by this company was purchased from Anthony La-Grave. Prior to this, the property was owned by the Valle andAubuchon families. Mining was carried on in this locality priorto the year 1820, the earliest operations being carried on at whatwas known as the Pratt mine. Upon taking charge of the property, the St. Joseph Lead Com-pany introduced many improvements, chief among which was theplan of prospecting with a diamond drill, which was inauguratedin 1869. It is claimed, however, that the deposits of disseminatedore were discovered through the use of the churn or drop 1880, a railroad was completed from this plant to Summit, asmall station on the St. Louis, Iron Mountain and Southern rail-road. In 1883 the works were almost completely destroyed byfire after which a new and better plant was erected. The Penproperty, consisting of over 300 acres, was purchased in 1883, whilein 1886, the adjoining Desloge mines, which had been opera
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