CHAPTER X. 



ECONOMIC GEOLOGY. 



By D. Dale Condit and Clyde P. Ross. 



MINING CONCESSIONS IN FORCE IN JULY, 1919. 



The notes of all the members of the expedition, as well as published 

 accounts of some of the deposits, have been used in the preparation of this 

 chapter, but the limitations of time made it impossible to study or even to 

 visit many of the localities where mineral deposits have been reported to 

 occur. 



As will be seen by a glance at the accompanying index map (Plate XXI), 

 the greater part of the Republic is covered by concessions granted by the 

 government for mining minerals of diverse sorts. A list of the concessions 

 in force in July, 1919, is given below. 



Mining concessions in force in the Dominican Republic in July, 1919. 



[See numbers on index map, PI. XXI.] 



MINERAL DEPOSITS NEAR HATILLO AND MAIMON, PROVINCE OF LA VEGA. 



By Clyde P. Ross. 



Deposits of ores of copper and iron south of Cotui, on and near Rio Yuna, 

 have been known for many years. Much prospecting has been carried on 

 intermittently, but the results have been discouraging. The deposits lie 

 along the northern border of the Cordillera Central at some distance from 



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