44 GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



material remaining being 250 feet or more thick in the Rothschild and Den- 

 ver Citv shafts. The steep north face of Breece Hill below the present 

 grade formed its southern wall, and below this it probably covered more or 

 less comj^letely all the region north of Stray Horse gulch, so that to its 

 action is probably due the exposure of the valuable ore deposits of Fr^^er 

 Hill, and also the removal of a great portion of them. 



