REPORT OF THE STATE GEOLOGIST. lxv 



is also impregnated with the ore. The width of this gangue is in some 

 places as much as thirty-five feet, and the material is a low grade ore of 

 about fifteen dollars per ton. 



In the Carrizo Mountains and further south in the Apache or Davis 

 Mountains are other good copper prospects, in addition to the many 

 outcrops in the Quitman Mountains and Sierra Blanca region which 

 show copper at the surface. 



LEAD AND ZINC. 



While many finds of lead ore have been reported in many portions 

 of the State, all those outside of the Central Mineral Eegion and Trans- 

 Pecos Texas have proved to be merely float specimens. In the Central 

 Mineral Eegion the lead ore occurs sparingly in veins in the older 

 rocks, under similar conditions and within the same area as marked out 

 for the copper ores, but it is principally found in the rocks of the Cam- 

 brian or Silurian age under circumstances similar to that in which it is 

 found in Missouri. 



Perhaps the most extensive "digging 1 ' on any of the veins of galena 

 was that of the Sam Houston Mining Company, who worked in the 

 Eiley Mountains. This shaft, which followed the irregular course of 

 the vein, was one hundred and sixty feet or possibly more in depth. 

 There was a string of galena, sometimes widening out and sometimes 

 almost entirely missing, but enough ore was not secured to satisfy the 

 owners and work was stopped. 



The deposits which occur in the horizon of an age apparently corre- 

 sponding to that of the Missouri galena ores have been prospected, 

 chiefly in Burnet County. The principal work is at Silver Mine Hol- 

 low. The galena is not only scattered through the sandy, ferruginous 

 vein material, but is found abundantly in the adjacent dark gray to 

 green magnesian limestone. Its original source is probably the "cav- 

 ern limestone " of the Silurian, but up to the present time there has 

 not been sufficient development to make it possible to speak with any 

 degree of certainty regarding the exact locality of the ores. 



No zinc ores at all are known in the Central Mineral Eegion. 



In Trans-Pecos Texas ores of both lead and zinc are very abundant 

 and contain silver and gold in variable quantities. The prospects of 

 the Quitman Mountains and vicinity are the best known. These 

 mountains are crossed by numerous vein outcrops and indications of 

 ore, and wherever prospecting holes have been sunk there are promis- 



5— geol, 



