582 CENTRAL MINERAL REGION OF TEXAS. 



most northern line have received the greatest amount of practical attention. 

 The Haynie mine, near Fly Gap, and some prospect holes west and south- 

 west of that locality, are included in this tract. Some of the openings show 

 more epidote than copper bearing mineral, and some have only the epidote 

 to show for the work done. This is a greenish yellow alumina-iron -lime sili- 

 cate, which is very abundant all through the areas of Burnetian and Fernan- 

 dian exposures, and it is frequently mistaken for a copper ore by persons not 

 familiar with minerals. When once the distinction is learned, however, this 

 error need not be made. 



The Middle Band. — At the junction of Dog and Little Willow creeks an 

 old shaft has exposed a peculiar gray schist, highly quartzose, which is 

 streaked and coated with malachite. This rock dips about north 15° east, in 

 consonance with the Burnetian trend, and there is some indication of a cross- 

 trend in the characteristic Texian course. Not far south of this place, on 

 survey No. 141, August Abel has some outcrops of copper ore which seem 

 to pursue a different course. The rock there is charged with malachite, bor- 

 nite, and chalcopyrite, and the vein is pronounced and persistent. This tract 

 merits thorough development. It is particularly interesting as an example 

 of an important deposit intimately associated with the northwest (Fernandian) 

 trend, although its relations to the Texian and Burnetian axes are apparently 

 as real as in other exposures. This band is the one which outcrops south of 

 Llano City and at points further east. 



The Southern Band. — There have been enough tests of the third line of 

 outcrops to prove its continuity across much of Mason and Llano counties, 

 although the band is broken by wide stretches in which no surface indica- 

 tions have yet been detected. 



Bauer and Durst Diggings. — Messrs. M. Bauer and George Durst have 

 struck this band in a slope which they have excavated near the west side of 

 survey 744, Mason County, east of Herman Creek, less than one mile from 

 its mouth at the Llano River. The rocks in which the copper stain occurs 

 are Burnetian in the normal trend, dipping here about 45° south 15° west. 

 The outcrops can readily be traced eastward into survey 746, where they be- 

 come confused by the crossing of several of the later trends. 



THE SOUTHERN OR BLANCO-GILLESPIE BELT. 



An axis of the Burnetian rocks crosses a portion of Blanco and Gillespie 

 counties, and it is probably continuous for many miles eastward and west- 

 ward beneath the later strata which now cover the region. Occasional ex- 

 posures at the surface or in the deeper workings of shafts enable us to 

 construct a section, as shown in Figure 64. 



