MIKES OUTSIDE THE LEADVILLE DISTRICT. 529 



gneiss, at the junction of the porphyry and the white quartzite. A little 

 below this a vertical fissure has been opened in the gneiss, about two feet 

 in width, containing galena and spathic iron. From the description, this 

 deposit is evidently of the same nature as the other limestone deposits in the 

 region, in this case, however, following mainly a vertical jointing plane. 

 It is hardly probable that such a plane would be found to be actually con- 

 tinuous for any great length, but very likely, from the persistence of its 

 direction, these planes have been developed more frequently in the neigh- 

 borhood of the line of the fault, and may have been accompanied by a 

 slight displacement. This movement would naturally extend for some 

 distance into the underlying Archean, and the ore currents would follow 

 similar joints formed in these rocks. From analogy with other deposits in 

 this district it is hardly probable that the so-called fissure veins in the gneiss 

 have been filled from below. 



Higher up on Loveland Hill, on the ridge which connects it with 

 Buckskin Peak, ore is found in the White Limestone and in the Lower 

 Quartzite. Among the prospects the La Salle ore body occurs between 

 the limestone and the quartzite; Little Nell and Julia are on narrow ver- 

 tical veins, also striking northeast, in the Lower Quartzite. On the very 

 top of the hill, in a small patch of Lower Quartzite, are the Mountain Lion 

 and Silver Exchange claims, whose ore is galena, with green carbonate of 

 copper, carrying gold and silver. On the Mosquito side of the hill is the 

 Kansas mine, at the junction of the White Limestone and Lower Quartzite, 

 in proximity to the porphyrite body, below which is the Christian Aid. 



On the southeastern end of Loveland Hill, towards Mosquito gulch, 

 numerous bodies of ore have been opened in the Paleozoic rocks. Of 

 these the most important is the Orphan Boy, which is abandoned and was 

 not visited. Its ore is found in quartzite, which probably belongs to the 

 Cambrian formation. The Jersey and other claims near Park City, in the 

 bottom of the gulch, have struck galena in the White Limestone. 



I5ETWEEN MOSQUITO AND HORSKSHOE GULCHES. 



South of Mosquito gulch, on Pennsylvania Hill, are many prospects in 

 the Blue Limestone, and on Ball Mountain in the Weber Grits. In none of 



MON XII 34 



