COPPER. 145 



veins in eruptive rocks, or in sandstones, or ore bodies of still 

 different character as set forth under the several sub-examples. 

 The copper districts are nearly all in the southeastern part of the 

 territory, but the Black range is near the center. 



2.04.19. Example 20a. Morenci. The Morenci district, known 

 also as the Clifton or Copper Mountain, lies in a basin, six to ten 

 miles across, whose high surrounding hills consist of limestone, 



FIG. 34. Geological map of the Morenci or Clifton copper district of 

 Arizona. After A. F. Wendt, M. E. 



probably Lower Carboniferous, which rests on sandstone, and this on 

 granite. The principal mines are grouped about the town of Morenci. 

 Clifton is seven miles distant at the point where the smelter of the 

 Arizona Copper Company is located. In the basin is a mass of por- 

 phyry, containing frequent great inclusions of limestone. Felsite or 

 porphyry dikes are also abundant in the surrounding sedimentary 

 and granite rocks. Several miles to the east there is an outflow 

 of late trachyte and evidence of recent volcanic action. From this 

 it appears that eruptive phenomena are abundant and widespread. 



