PlIEFAOE. 



The writer's ackuowledgmeuts are due to many geiitlemeu, superin- 

 tendents of mines and others, who rendered valuable assistance in furnishing 

 information in regard to the country, and who generously afforded every 

 facility in the prosecution of the work. Special thanks are due to Mr. R. 

 Rickard, formerly superintendent of the Richmond Mining Company, and 

 to Mr. Thomas J. Read, superintendent of the Eureka Consolidated Mining- 

 Company. 



June 6, 1891. Arnold Hague. 



