140 .V. Ix. J tinner 



'I'Ik-.vl- ii'tuiiis sliow thiit tlio riilu'st ori' was obtaiiuMl fidiii hftwet'ii 

 l(»<l aii.l 2(1(1 ft., and that tlu' ore from shallow dcjiths was pooivr 

 ill valui' than tliat from the <k'OiH>i- workin'rs. No infefeiu-es i-an 

 l>i' drawn with safety from those yields, respecting the effec-t of 

 seiondary eiii iihment on the auriferous quartz. The ground water 

 level oeenrs at a de})th of about 200 ft., and the richest (luartz caiue, 

 therefore, fiom above this level; although the 300 ft. level alone 

 yielded 2000 ozs. of gold, eqtiivalent to nearly one-fourth of the 

 total gold won from this reef. 



D.—Tou- Toil'. 



Several quartz veins have been prospeeted, with varying success, 

 near the Yow Yow diorite intrusion. The best known of these reefs 

 are Allen's. Eureka. Comet, Murray's. . No. 5. and Hirr's reefs. 

 The records slu)w that Allen's reef was the largest producer of these, 

 but. owing to the multipilicity of names of claims and reefs, it is 

 manifestly impossible to calculate the yields from i)uli\ idual reefs 

 with any degree of exactness. AlU-n's reef varied in width from 

 IW(. to three inches, up To the corresponding nnmlvr of feet, and 

 was not Worked at greater depths than 200 ft. The reef occurs 

 within the diorite. and according to the Mining Surveyor, the yields 

 from tlie hard, undecomposed roik weri' jnst as ricli. or even 

 richer, than those from near the surface. With the excejttion of 

 tlie Caledonia, none of these reefs have been worked behnv 200 ft. 

 At this mine a shaft has Ix^en sunk l>etween 200 and 300 ft. in 

 depth, and several very thin, nearly vertical dipping, veins, have 

 been worked. These, however, were unprofitable in depth, not ite- 

 •cause of any dei.'rease in values, but owing to the great amotint of 

 very resistant diorite wjiieh had to l)e extracted with the quartz. 

 Stibnite is the jiredominant vein svdphide. and pyrites and mis- 



