628 CENTRAL MINERAL REGION OF TEXAS. 



posed chert or chert gravel of this age obscures everything, there is a chance 

 that the veins do approach nearer the surface than is supposed. My observa- 

 tions do not, however, lend probability to this last hypothesis. The outcrop 

 of this band may be regarded as rather overdrawn upon the map, but its 

 course is properly indicated, giving hints as to the best -places for prospecting. 

 No important discoveries of the limonites have yet been made in this line. 



THE MAGILL PEAK BAND. 



Practically speaking the vein course which passes northwestward via Ma- 

 gill Peak is but an extension of the manganiferous iron ore field of the Pack- 

 saddle Mountain band. But its contents vary somewhat in different parts of 

 the outcrop line. Wherever the Silurian beds occur in its path the ore is 

 usually of good quality. As to exposures in the area of the San Saba Series, 

 the same must be said as was remarked under the previous head. The whole 

 belt is an important one, but individual outcrops must be adjudged wholly 

 by the results of special tests. 



THE RILEY MOUNTAIN BANDS. 



The extensions southeastward of the Llano bands of magnetite strike 

 through the middle portion of the Riley Mountains. The veins are very 

 large and the ores of superior quality. One of the most characteristic out- 

 crops has been worked by Chas. Roberts, upon the eastern flank of the Riley 

 Mountains, a little south of the entrance to Honey Creek Cove, Llano County. 

 Good exposures of the same band also occur northwest of the magnetite area, 

 in the San Saba River valley. Southeastward, in Blanco County, other 

 promising indications appear in the lines shown upon the Economic Map 

 herewith. 



THE CLICK MOUNTAIN BAND. 



The vein which follows the course of the Click band of hard ore is usually 

 well defined and valuable wherever its outcrops can be traced through the 

 Silurian limestones in the course indicated upon the map. It is not possible 

 to be more explicit, because complicated faults have broken up the veins 

 in some cases, more especially, perhaps, in the southeast. In San Saba 

 County this band is usually less disturbed, but in some places it is covered by 

 the later rocks. Wherever the plotting on the Economic Map is deficient, it 

 will ordinarily be found that a reference to the Geologic Map will explain any 

 apparent discrepancy, although it has been impossible to record every detail 

 of structure upon maps drawn to such small scales as we have been compelled 

 to adopt in this Report. 



