322 QUICKSILVER DEPOSITS OF THE PACIFIC SLOPE. 



distance from one anotlier. On tlie 1,850 (1,832 to 1,847) it is the north- 

 erly alta which extends to the north group. The same is true of the clays 

 on the 1,735, and on the 1,650 it is also the north fork of the alta which 

 has been followed to the neighborhood of the Randol shaft. On the 1,550 

 (1,540 to 1,547) there are three lines of alta, two of which are to the south- 

 west and one to the northeast. From tlie continuities just mentioned on 

 the three levels below this it is evident that the northerly alta of the 1,540 

 in the southwest region answers to the alta in the north grouji of ore bodies, 

 and to emphasize this relation I have connected the two altas by a straight 

 dotted line. A precisely similar relation exists on the 1,440. Thus for a 

 vertical interval of 500 feet there is abundant evidence of two fissures, the 

 outer or more northerly of which leads into the north group of ore cham- 

 bers. The inner or more southerly fissure is certainly that upon which ore 

 has been followed from the top of Mine Hill, as may clearlv be seen by ref- 

 erence to the section of this channel on Atlas Sheet X. The southerly or 

 inner altas on the 1,540 and 1,440 levels form the hanging wall of ore body 

 XLT, which appears on Atlas Sheet X, and this section shows that from this 

 body to the top of Mine Hill the ore is substantially cpntinuous. The outer 

 or northerly alta appears on Atlas Sheet X as the hanging wall of the body 

 XLVIII. These sp-me altas in the north grou^J overlie the bonanzas known 

 as XXI, XLIV, XX, which appear on the section through the Randol shaft 

 (Atlas Sheet XI), and from this section it is manifest that the fissure carry- 

 ing these bonanzas is continuous up to the 900-foot level. Referring again 

 to the plan of the altas (Atlas Sheet XIII), it is seen that the two groups 

 of ore bodies are so fVir apart between the 1,440 and the 1,050 that from 

 this plan alone no certain result could be reached as to the distinctness of 

 the fissures within this interval. The lines of altas are very tortuous as 

 well as distant, and without the aid of the sections it might seem quite pos- 

 sible that the altas of the same level were continuous in the two groups; 

 but in the foregoing I have sliown that each of these fissures for the inter- 

 val between the 1,440 and the 1,050 continues in depth and that at lower 

 levels the fissures are distinct. It is true that the fissures might come to- 

 getlier above, thougli this would be an unusual structure. But on the 950 



