CHAPTER XVIII. 



SUMMARY. 



The following summary states in a condensed form the nature of the 

 investigations described in the foregoing chapters and the conclusions to 

 which they have led. 



Description of Eureka District. — Eureka Mining District is situated on the west- 

 ern side of the Diamond Range, in the eastern part of the State of Nevada 

 and south of the Central Pacific Railroad. 



The district was discovered in 1864, but it was afterwards abandoned 

 until the latter part of 1 868, when mining operations were again begun. 



The most important town in the district is Eureka, situated about 2 

 miles distant from the principal mines which are on Ruby Hill. 



This hill forms the northern spur of Prospect Mountain, a ridge several 

 miles long, which reaches an altitude of over 9,000 feet, and itself forms a 

 spur of the Diamond Range. North of Ruby Hill lies Adams Hill, a low 

 elevation distant something less than a mile. On these hills and on the 

 mountain and its spurs are situated all the mines of any importance in the 

 district. 



As nearly as can be estimated the production of the precious metals 

 up to the end of 1882 has been about sixty millions of dollars. It is diffi- 

 cult to ascertain the quantity of lead produced, but this is approximately 

 225,000 tons. 



SURFACE GEOLOGY. 



Mr. Arnold Hague has described the general geology of this district," 



•Abstract of Keport on the Geology of the Eureka District, Nevada, by Arnold Hague. Third 



Annual Beport of the Director of the U. S. Geological Survey. 1882. 



(175) 



