240 CERTAIN SAND MOUNDS OF 



Another partial analysis of the same copper yielded : — 



"Arsenic .... 0-0010 per cent. 

 Silver .... 0-0253 

 Antimony . . . None." 



A partial analysis of the "Atlantic" copper showed : — 



"Arsenic .... 0-0028 per cent. 

 Antimony . . . None. 



Silver .... 0-0012 per cent." 



A partial analysis of the "Central" copper gave : — 



"Arsenic .... 0"0016 per cent. 

 Antimony . . . None. 



Silver .... 0-0145 per cent," 



We are indebted to Thomas Nelson, Esq., Secretary and Treasurer of the 

 Osceola Consolidated Mining Company, for very beautiful specimens of copper from 

 the Osceola mine, as to which Ledoux and Company make the following report : — 



"Copper .... 99-9500 per cent. 



Silver .... 00111 



Iron .... 0-0290 



Arsenic .... Trace. 



"Note: The sample was examined also for lead, bismuth, antimony, nickel, 

 cobalt and zinc, none of which was found." 



James B. Cooper, Esq., Superintendent of the Calumet and Hecla Smelting 

 Works, in addition to much valuable information, has furnished us with a number 

 of fine specimens from various mines from the " Lake" district, and we wish here 

 to return thanks for his courtesy and promptness. A specimen of copper from the 

 Franklin mine, furnished by Mr. Cooper, was analyzed by Ledoux and Company, 

 with the following result : — 



" Copper .... 99-90 per cent. 



Silver .... Trace. 



Iron. .... 0018 " 



" Note : The sample was examined also for arsenic, antimony, lead, bismuth, 

 zinc, nickel and cobalt, none of which was found." 



The presence of nuggets of native copper has been noted in " the drift," and 

 it is likely that aboriginal wants were to a certain extent supplied from that source. 



We have obtained from Dr. A. E. Foote a nugget of native copper said to be 

 from "the drift," Illinois, and its derivation from "the drift" at least is unmis- 

 takably evidenced by its rounded and water-worn appearance. 



This copper, analyzed by Ledoux and Company, gave the following result : — 



" Copper .... 99*930 per cent. 



Silver .... 0-007 



Iron .... 0-014 



Nickel and cobalt . . . 0-006 



