26 H. Wurtz on Cobalt and Nickel. 
and ornamental purposes. A turnpike road was found at one , 
stratum ?) in Crowder’s mountain, but this was not visited. | 
It was also perfectly evident, at most of the iron ore beds be- . 
fore mentioned, that the ore was merely the gozzan, or product 
of oxydation of large strata of sulphids, probably pyrrhotine, 
existing below. In some of these places, as at the Ormond, 
Ferguson and Briggs’ Ore Banks, the mining operations have 
penetrated, in places, to the unaltered, or only partially altered, 
pyrites. At the Alison and Costner Ore Banks, which are ex- — 
cavations into strata of ore from thirty to forty feet in width, the — 
material last thrown out is a true magnetite schist, mixed however — 
with much limonite. 4 
Throughout the whole range, wherever examined, the talcose — 
schists were found to contain, in numerous places, small seams, — 
incrustations and stains of a black substance, which gave blowpipe — 
reactions for cobalt. At every one of the mines above mentioned 
the ore, or refuse material thrown out, was found to be more or 
u e exhibiting on the section a bright 
black lustre like that of compact graphite; and to these proper- 
ties it owes the designation of “black lead,” which it bears 
among the people of the country (to whom it is familiar). 
