ELECTRICAL AC^TIYITY OF ORE BODIES. 



331 



of Reich were very largely distorted by, discrepancies of the kind discussed 

 in this paragraph. 



Relative position of the ore bodies. — Bcfore procceding furthcr, it will be neces- 

 sary to give the reader a, general idea of the disposition of the ore bodies of 

 the Richmond mine. It will be convenient, and fully sufficient for the 

 present purposes, to consider them with reference to a horizontal and a ver- 

 tical projection. The former will be given with the difierent sets of obser- 

 vations which are to follow. For the latter I am indebted to Mr. R. Rickard, 

 superintendent of the Richmond Mining Company, without whose cordial 

 cooperation it would have been impossible, in the time allotted, to carry out 

 these experiments. To Mr. Rickard are also due the following details and 

 sketch 



Fig. 26. — Vertical sectiou through ore bodies. 



In Fig. 26 the horizontals passing across the diagram represent the 

 levels in feet below the shaft-mouth as a datum. Different ore bodies are 

 differently shaded, the attached numbers depending upon the date of their 

 discovery. The sketch is intended to illustrate the relative positions of the 

 ore bodies one to another only, as seen from the extreme north. 



Chamber No. 11 begins on the 200-foot level and continues to the 500- 

 foot level. 



