82 



TE 



The great mineral wealth of the State is shown by its record of 

 mineral production, which in 1913 amounted to more than $53,000,- 

 000. The fire leading products in that year were copper, $25,024, 1 24 ; 

 silver, $7,903,240; lead, $7,309,579; coal, $5,384,127; and gold' 



FiGUKE lO.-Map showing outline of the Great Basin and the lakes it once contained. Shaded areas 



show Quaternary lakes; dotted lines show boundaries of drainage basins 



$3,565,229. 



third among the States in 



duction of silver and lead and fourth in the production of copper 



and 



beyond the Mexican boundarj^, but is 

 limited by the drainage system of < 

 rado River on the southeast. The 



nil 



and nearly 500 mill 



"widest part- 

 niiles, an ar 

 France. 



The Great 

 fied surface f< 

 valleys and r 

 taining lufty pea 



contains 200,000 



^oo 



It 



not, as its 



name might suggest, % ^gle paQ-shaped 



depression, gathering its waters to a com 

 mon center, but is divided into a large 

 number of independent drainage areas. 

 Both the mountains and the valleys are 

 of types more or less peculiar to the region. 

 The mountains are long, narrow ridges, 

 most of which extend from north to south 

 and project abruptly out of the plains, 

 there being a noticeable absence of foot- 

 hills. Many of them terminate at th© 

 ends as abruptly as their side slopes join 



surrounding 



this 



aad some are sf> exten^iv^ that they appear 



