. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. 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 havestruck this band in a slope which they have excavated near the west side ofsurvey 744, Mason County, east of Herman Creek, less than one mile fromits mouth at the Llano River. The rocks in which the copper stain occursare Burnetian in the normal trend, dipping here about 45° south 15° outcrop
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. 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 havestruck this band in a slope which they have excavated near the west side ofsurvey 744, Mason County, east of Herman Creek, less than one mile fromits mouth at the Llano River. The rocks in which the copper stain occursare Burnetian in the normal trend, dipping here about 45° south 15° 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 Gillespiecounties, 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 toconstruct a section, as shown in Figure 64. LEAD. 583. Fig. 64. Section and plan along line E-F on map (Plate XXI), crossing the most southern of theBurnetian Folds exposed in the Central Mineral Region. The area in which there may be some little chance of the discovery of cop-per ores in this belt may be roughly defined as extending from west of RoundMountain, in Blanco County, to aline east of Loyal Valley and Cherry Spring;but there is very little of the tract in which the copper bearing strata arenear enough to the surface to make mining profitable in any event. In fact,the existence of the belt as such is chiefly predicated upon the discovery oftraces of malachite in the deeper workings of the Nonly mines, near EnchantedRock. At that point the structure is very complicated, and the inducementsoffered by the returns have not been such as to justify extensive may be confidently predicted that if any copper depos
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