154 



TRANSACTIONS OF THE 



deep shaft, No. 10, at between thirty feet from the sur- 

 face of the land and the bottom of the shaft, is such as is 

 shown in fig. 4 of the accompanying plans. 



On the whole, therefore, it is rendered certain by the 

 above examination, that 209 yards, or 627 feet, of auri- 

 ferous quartz vein, with a full average width of thirty 

 inches, have been laid open'to view, being equal to 1576 

 cube feet, at one foot in depth or thickness, and as the 

 cube foot is equal to about two bushels of ore when 

 broken out, we shall have 3,134 bushels of ore out of 

 each foot in depth. But the vein has been exposed and 

 laid open for more than ten feet average depth, making 

 31,340 bushels of ore that may reasonably be expected 

 to be raised out of every ten feet in depth of the pre- 

 sent exposed part of the vein, which is but very little 

 more than one-fourth part of its entire length 5 so that 

 if the remainder of the vein should prove equally pro- 

 ductive with that which has been already exposed, (and 

 which there is little or no reason to doubt,) four times 

 this quantity, or 125,360 bushels of ore may be expected 

 out of each ten feet in depth of this single vein ; and 

 how deep it may proceed into the earth it is impossible 

 to say ; but reasoning from analogy and experience in 

 other mines, it may be fairly inferred that the vein will 

 become wider, richer, and more valuable as it proceeds 

 downwards for at least two or three hundred feet. But 

 as the knowledge of these veins is yet in its infancy, it 

 would be vain to offer any thing like a well grounded 

 opinion upon this subject until it has been further inves* 

 tigated and proved. 



