LEAD. 339 



such examinations of individual properties as would be demanded of one em- 

 ployed by private parties. It is, therefore, only proper to state here the gen- 

 eral conclusion that while pioneer work and crude methods of excavation 

 have not developed a paying mine in the whole region, there is such a show- 

 ing in a general way as will justify the expenditure of considerable capital in 

 further explorations, provided that it be used with due caution under compe- 

 tent advice and superintendence. Without much preliminary investigation 

 and the most prudent management, success can hardly be anticipated. 



The writer has examined fully thirty localities in the Babyhead District in 

 which excavations have been made in search of copper ores, and all of them 

 agree well with one or other of the prominent types already described. The 

 conclusions already given apply with more or less force to all. The pros- 

 pecting has not been so thorough as it has been extensive. 



B. THE KOOCHVILLE DISTKICT. 



There is only one other region in which copper prospects have been de- 

 tected, but the extent of that tract may be considerable, although discovery 

 has thus far been limited to one locality. In Mason County, in the southern 

 part of the German Emigration Society Survey, No. 750, about two miles 

 west of Koochville. there is an exposure in the bed of a little branch of Co- 

 manche Creek. These rocks have been leached out at the surface, and yet 

 samples taken from the outcrop in the creek assay high enough to attract 

 attention. (See No 29, Table I.) A very little work was done here a few 

 years ago, but the traces are almost obliterated now. The geologic structure 

 is very much like that at the excavations in the vicinity of Little Llano 

 Creek, excepting that here the north-south trend prevails and the older strikes 

 are deeply buried. The same or similar conditions prevail over a large area 

 adjoining, and it may be that further search will be rewarded. Deep work- 

 ings in this region may be best. On some accounts there would seem to be 

 greater chance of a continuous vein in situations like this than in the cases 

 already described; but this is reasoning more upon general principles than 

 upon exact knowledge of the local problems which the workings have not yet 

 revealed. The writer hopes to be able to investigate this matter more fully 

 in the season of 1890. 



2. LEAD. 



TTe shall have to devote more special attention to the Silurian rocks before 

 the exact relation of any of them to the galena limestone of other regions is 

 made clear. All that can be positively asserted now is that the most promis- 

 ing lead district within the Central Mineral Region is where strata abound of 

 an age not far removed from the horizon of the Missouri galena ores. Aside 

 from the small proportions of lead in some of the veins of the Babyhead Dis- 



