IIOKN EXI'EDITION — ECONOMIC tiEOLOGY. ( / 



country-rock includes nietamorphic gneisses .'ind mica schists, intruded Ijy eruptive 

 dykes. Where not absolutely vertical tlie un(]erlay is almost wltliout exce])tion to 

 the west, and varies from 5" to 10". The outcrops of these reefs, wliich are not, 

 as a rule, traceable for any great distance, vary in width from four inches to two 

 feet six inches, wliik; at the bottom of trenches and shafts the width varies fi'om 

 three inches up to four feet six inches. Taking the average of ten reefs, the width 

 at the surface was found to be twelve inches, while at an average depth of twenty- 

 one feet it was fifteen inches, (iold is contained not only in the veinstone but 

 occasionally and in a. less degree in the selvage also, on one or both sid(.\s tif the 

 reef. In nearly all the reefs the g<-)ld is as.sociated with gossafy (juarlz, some of 

 the best results being obtained fioiii a spongy siliceous matrix, wliich cruml)les 

 easily when subjected to pressure. The oxide of iron has been derived from the 

 oxidation of iron pyi'iles, and in many cases of copper pyrites also. J)eri\e(l from 

 the copper pyrites, or in some eases frfiii suliihides of cop|)er, there are present the 

 green carbonate (malachite) antl the blue carbonate (azurite) of coi)per. 



The following is as complete a list as possiljlc of the results of samples taken 

 for treatment to the Huntington INlill erected at Clara\ille : 



Naiiiii of Jliiie. 



liiianl 



;it;\ Treatcil. 



Viclil of (.:olcl I'l-i-Ton. 



Monarch 



5 



Tons 





loz. 2dwts. 



Wipe Out 



- 10 



,, 



(0 



- 1 „ 10 „ 



jNIatrix - 



1 



») 





■J" ,, 



Orient 



- ^2 



„ 





13 „ 



Kound Hill - 



1 







(5oz. 



ISaid not to lie })icked 

 stone 



2A „ - lOdwts. f l^'-ol'^il'ly I»'avy loss 



( durnig treatment 



Extension of i!ee Hive - 5 ,, - 17 



Wheal Mumli - - 3A „ - loz. 1 



Wheal Fortune - - 32 „ - 13 



- 20 „ - 17 



Name of mine unknown 

 to me 



-0 „ - IS „ - _ 



„ „ U „ - loz. 4 „ - — 

 10 „ - 1 „ 3 „ - _ 

 12 - 1 3 - 



The total result of these crushings is that 11") tons yielded 140oz. lOdwts., or 

 it the rate of over IDdwts. per ton. 



