. [Reports]. In some parts of the mine, they are calcite and galena are frequently smeared along the walls ofvery tight joint planes and in other cases the galena is spatteredalong the walls in extremely thin films. Plate LXXX. is a typicalillustration of the manner of occurence of these veins. They con-stitute a somewhat important source of galena in some parts ofthe mine. In the case illustrated, the solutions evidently enteredthese joints from above, since they clearly die out below and Iwas unable to find any other avenue for the solutions to enterexcept from above. Associated
. [Reports]. In some parts of the mine, they are calcite and galena are frequently smeared along the walls ofvery tight joint planes and in other cases the galena is spatteredalong the walls in extremely thin films. Plate LXXX. is a typicalillustration of the manner of occurence of these veins. They con-stitute a somewhat important source of galena in some parts ofthe mine. In the case illustrated, the solutions evidently enteredthese joints from above, since they clearly die out below and Iwas unable to find any other avenue for the solutions to enterexcept from above. Associated with the calcite and galena, Ifrequently observed crystals of pyrite. Samples from the decomposed beds of disseminated ore nearthe bottom, were analyzed and shown to contain a considerablepercentage of lead carbonate. One sample showed per centof lead carbonate, another per cent of lead carbonate, and athird per cent of lead carbonate. There are numerous illustrations of leaching of the galena,. ST. LOUIS SMELTING AND REFINING CO. 129 especially of the disseminated type. In a number of places I re-cognized this as one of the reasons for the extremely lean characterof the ore deposit in certain parts of the mine. In fact crystals ofgalena which were undergoing decomposition were observed in anumber of places. Adjacent to the channels, the disseminated galenais almost entirely removed where the rock has been completely de-composed. In this mine, there is every evidence that the dissemi-nated galena is taken into solution much more readily than thatwhich is crystallized in openings such as solution cavities and jointplanes. MINE NO. 3. This mine is located 2700 feet north of St. Francois station•on the Mississippi River and Bonne Terre railroad and the samedistance a little west of north of shaft No. 2. The sinking of theshaft leading to Mine No. 3 was begun June 14, 1899. Miningoperations began in May 23, 1900. The collar of this shaft is above sea level
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