342 Mr. Kenwood's Notice of the Morro Velho Mine. 



this joins the great Quebra Panella, which inclines towards 

 the S. 60°-75°, and, although of very irregular dimensions, its 



greatest breadth is not less than forty-eight feet. The Gut 

 forms the prolongation eastward, and dips S.E., parallel to the 

 cleavage of the contiguous slate rock : the widest parts of this 

 are not more than eight feet in breadth, and the greater portion 

 is much narrower. Connected with the last-named part, on 

 the E., is the Bahu, which underlies S., and is, on an average, 

 about twenty 'four feet wide. A bed of quartzose slate, slightly 

 charged with iron pyrites, separates the Bahu from the West- 

 ern Cachoeira, which is at present un wrought and inaccessible. 

 Two principal veins and several smaller ones branch off from 

 the Western Cachoeira; the most northerly is the Gamba, 

 which dips S., and is from two to eight feet in breadth ; the 

 other, called the Eastern Cachoeira or Luiza, has about the 

 same width and inclination, and still further eastward also di- 

 vides into other and smaller veins. 



c. The minei'al composition of the Champion Ground is 

 quartzose slate, thinly spotted with pyrites. That of the other 

 productive portions is, for the most part, very arsenical iron 

 pyrites, more or less mixed with quartz and a little slaty matter, 

 and frequently spotted with copper pyrites. Occasionally, too, 

 isolated masses of black quartz and of copper pyrites are found, 

 as well as cavities {vughs) lined with crystals of quartz and of 

 arragonite. It is with these ingredients that the gold is mixed, 

 and here, as in the greater number of Brazilian mines, the 

 richer parts are usually near the upper side {hanging *wall) of 

 the vein ; the metal is however seldom, or never, distinguish- 

 able in the stone. 



The shallower part of the Eastern Cachoeira consists of 

 earthy-brown iron ore {gossan)^ interspersed with stones of 

 iron and copper pyrites. 



d. The connexion between the metalliferous mass and the 

 contiguous rock is by a gradual transition, the pyritous matter 



