. [Reports]. ed below the clay pocket, keeping a general eastand west direction. I have carefully examined the location of these shallow dig-gings and with a few exceptions they are confined to the area overwhich the Bonneterre dolomite is the surface rock. Seldom werethese shafts sunk through any considerable thickness of Davisshale and on this as well as on other lands in the district carefulmapping of these ancient diggings would serve to locate approxi-mately the contact between the Bonneterre and Davis formations. To write the history of early mining on this property as wellas to compile
. [Reports]. ed below the clay pocket, keeping a general eastand west direction. I have carefully examined the location of these shallow dig-gings and with a few exceptions they are confined to the area overwhich the Bonneterre dolomite is the surface rock. Seldom werethese shafts sunk through any considerable thickness of Davisshale and on this as well as on other lands in the district carefulmapping of these ancient diggings would serve to locate approxi-mately the contact between the Bonneterre and Davis formations. To write the history of early mining on this property as wellas to compile a record of production, distinct from that of theother mining properties of the district, would require more timethan is at my disposal. Attention, however, should be called to thefact that the deposits of lead exploited by these shallow mines, werevery rich and that the aggregate annual production should bethought of in terms of millions of pounds. This land was first prospected with a diamond drill in 1876,. FEDERAL LEAD CO. Ill at which time some ore was encountered at a depth of 240 company was organized to develop the property but the attemptat that time was unsuccessful. However, in 1890, the companybegan sinking a shaft and at the same time resumed prospectingwith a diamond drill. In May 1892 the shaft reached the ore bodyat the 242 foot level and upon this some drifting was done. In themeantime the diamond drill prospecting disclosed a richer andmore extensive ore body at a depth of from 360 to 380 feet and itwas decided to sink the shaft to this level. This shaft, the Cen-tral, now Federal No. 6, was completed during the Summer of1893. The first production was in 1894. Shaft No. 7, formerlyknown as the Rogers, was completed and in operation in 1894 to 1904, when the Central Lead Company sold out tothe Federal Lead Company, the total production, including thatfrom the Theodora, was 38,700 short tons of concentrates valued atover three millions of dollar
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