336 CENTRAL MINERAL REGION""OF TEXAS. 



m'gehee diggings, head op little llano creek. 



In the upper valley of Little Llano Creek, where it flows nearly east, work 

 has been done on a tough garnet rock, carrying patches of fine-grained 

 hornite. This is probably Burnetan material, trending north 75 degrees west, 

 and thus it agrees with most of the ore deposits of the region, although ex- 

 cavation has not entirely followed this course. The gangue is massive, but 

 its environment is very similar to that of the crystalline garnet in the same 

 trend on Clear Creek, Burnet County. Fibrolite accompanies the garnet in 

 both places. Some of the ore here (Llano County) is saccharoidal in appear- 

 ance, causing a glistening which makes it seem to contain more hornite than 

 is really present. Two assays of the product of this shaft are reported in 

 Table I. 



M'GEHEE SHAFT, YOAKUM CREEK. 



About one mile east of Baby head Postoffice, near the head of Yoakum 

 Hollow, Capt. McG-ehee, the pioneer of the Babyhead District, has sunk an- 

 other shaft which seems originally to have been in ore upon a vein or deposit 

 coursing in the Burnetan trend. The exploration, as in other places, has 

 been pushed more in a north-south direction, and the ore body has been 

 missed in the deeper workings. This excavation illustrates the difficulty of 

 development in the region and the necessity of gaining a practical knowledge 

 of the geologic structure before planning work. Not far east of the locality, 

 a northward bearing fault has further complicated matters, and the mixture 

 of trends below surface, here as often elsewhere, makes a dyke or an up- 

 turned stratum more prominent than the ore body. In this case the gangue 

 is largely a granitic rock, impregnated with malachite. Assay No. 6, from 

 this locality, was selected ore and does not represent an average product, al- 

 though it may serve to indicate the quality of the mineral streak when as- 

 sorted closely. 



m'gehee shafts, wolf creek. 



Two deep shafts not far apart, connected (I am told) by a drift now under 

 water, were sunk by Capt. McGehee on a hill between Wolf and Babyhead 

 creeks. The situation is very similar here to what has been described at the 

 Mexican shafts on Babyhead Creek, but there is more copper strain in the 

 quartz. This property was not in condition for detailed inspection much below 

 the surface, at the time of my visit. There is some appearance of ore at the 

 outcrop, and small crystals of chalcopyrite, with some tetrahedrite, occur spar- 

 ingly. That is all that can be predicated of the vein above the present 

 water level. 



The Burnetan (older Archaean) rocks come out well in their characteristic 



