OF KECENT PLANTS IN" BKOWST IEON-OEE. 



3 



Pig. 1. — Plan of part of Rio Tinto. 



Fig. 2. — Section in line ABou Plan. 



S.W. tf-E. 

 South Mesa de Rio Cerro de South Cerro 



Daru. loa Pinoa. Agrio. laa Vacas. Lode. Salomon. 



Level of Eio-Tiuto Station. 



|^v ;x A'<vl Porphyry. L%#££p-J Capping of lode 



WMBk Slate - IHHl Mineral. 



Iron caps. 



resulting from the metallurgical operations which were carried on 

 upon the declivity of the opposite hill. 



In some instances the decomposed clay-slate has been partially 

 removed from beneath the iron-ore, from which blocks have been 

 detached, and have slidden a considerable distance down the surface 

 of the slaty declivity. 



A specimen of this iron-ore, analyzed in my laboratory, afforded 

 the following results : — 



b 2 



