NEW IDEIA MINE. 



303 



form of the stockworks from the mere projection on a horizontal plane. 

 No purpose would therefore be answered by reproducing the plan of the 

 mine in this volume, but an idea of the distribution of the deposits will be 

 conveyed by the following sketch, in which some of the ore bodies and the 

 position of the clay wall are shown in horizontal projection in a somewhat 

 generalized manner (Fig. 12). Leaving the New Hope out of consider- 



FiG. 12. c«, Elcan Streak, nh, New Hope. Ill, Stockworks. b. Bell tunuel ore chamber. //, Strike ol' clay wall 

 dividing the New Hope from the remaining ore bodies. 



ation for a moment, it is evident that the remaining deposits may be divided 

 into two groups, one including the Elvan Streak and contiguous bonanzas, 

 together with the Bell tunnel ore body, while the other cluster comprises 

 the stockworks. The former of these groups I have had good opportuni- 

 ties of examining. It is beyond question that north of the clay wall the 

 Elvan Streak is a fairly regular, nearly vertical vein, wliicli has aflforded a 

 passage for ore-bearing solutions. These have permeated the walls wher- 

 ever they were permeable and ore chambers have been formed as adjuncts 

 to the vein. The Bell tunnel body consists of very slightly modified sand- 

 stone of porous texture, impregnated with cinnabar, which also forms seams 

 wherever cracks in the rocks permitted such deposition. It lies in the di- 

 rection of the strike of the Elvan Streak, and the fissures through which 

 the two were charged with ore must, I think, be very closely related. 



