110 SILVER-LEAD DEPOSITS OF EUREKA, NEVADA. 



the main fissure between the place where the vein was struck in the 1,200- 

 foot Locan cross-cut and the Richmond ground. This is made all the more 

 probable by the fact that although the Richmond received the water of the 

 Eureka in the manner mentioned on page 51, yet the water level in the 

 "water winze" of the former mine was not materially altered. 



Prospects of water in the future. — Although this flow of water has not been con- 

 trolled by the present pumping machinery, it is unlikely that it- is of such 

 an extent that more powerful pumps would not exhaust it. It must be 

 borne in mind that the lower belt of shale cannot but act, partially at any 

 rate, as a barrier to the flow of water from the upper limestone, and, there- 

 fore, it is but reasonable to expect that the flow of water in the lower lime- 

 stone will not be uncontrollable. This has been indicated in a measure by 

 the fact that the limestone encountered in the cross-cut on the 1,200-foot 

 level of the Richmond was at first nearly dry, and the water that was after- 

 wards struck on the same level was not present in such quantity that a pump 

 like the one at the Locan shaft would not easily have managed it. It is 

 very likely that the contact of the quart zite and limestone will be the 

 principal source of the water, and for that reason it is to be avoided as 

 much as possible. 



