. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. ies of copper ore in the has been done, however, taken in connection with the outcropsand assays, and our knowledge of tne geological formation of the coun-try, suggests the accumulation of ores of considerable importance below,and will justify a much larger expenditure for the purpose of develop-ing them than has yet been made. COPPER ORES OF TRANS-PECOS TEXAS. The ores of this district have been known for many years, and con-siderable prospecting has been done on them
. First[-fourth] annual report of the Geological survey of Texas, 1889[-1892] Edwin T. Dumble, state geologist. ies of copper ore in the has been done, however, taken in connection with the outcropsand assays, and our knowledge of tne geological formation of the coun-try, suggests the accumulation of ores of considerable importance below,and will justify a much larger expenditure for the purpose of develop-ing them than has yet been made. COPPER ORES OF TRANS-PECOS TEXAS. The ores of this district have been known for many years, and con-siderable prospecting has been done on them. There is, however, onlyone mine in operation at present—the Hazel Mine in the Diabolo Moun-tains, near Allamore, El Paso County. This mine is situated at thefoot of the Sierra Diabolo on a lime-spar lead cutting through a redsandstone. The principal ore is copper glance or sulphide of copper, attimes carrying a good deal of wire silver, and occasionally rich pocketsof grey copper. This pay streak runs in a vein from a few inches upto ten feet in width, in a gangue of strongly siliceous limestone, which. a o REPORT OF THE STATE GEOLOGIST. lxv is also impregnated with the ore. The width of this gangue is in someplaces as much as thirty-five feet, and the material is a low grade ore ofabout fifteen dollars per ton. In the Carrizo Mountains and further south in the Apache or DavisMountains are other good copper prospects, in addition to the manyoutcrops in the Quitman Mountains and Sierra Blanca region whichshow copper at the surface. LEAD AND ZINC. While many finds of lead ore have been reported in many portionsof the State, all those outside of the Central Mineral Eegion and Trans-Pecos Texas have proved to be merely float specimens. In the CentralMineral Eegion the lead ore occurs sparingly in veins in the olderrocks, under similar conditions and within the same area as marked outfor the copper ores, but it is principally found in the rocks of the Cam-brian or Silurian age u
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