212 SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
limestone the rock is heavily stained by hematite and limonite. In 
some cases at least these appear to be gossan deposits and the deter- 
mination of the underlying sulphides might prove profitable. 
The older alluvium is contemporaneous with rocks of Death Val- 
iey in which some borax minerals have been found. With the pos- 
sible exception, however, of the area north of Tin Mountain and one 
up Emigrant Wash beyond the boundary, the Panamint Range is 
not worth prospecting for borax. 
