COLORADO PRINCE MINE. 503 



from one hundred to two hundred ounces of silver to the ton, but it is 

 generally low in lead, and therefore difficult to smelt. It frequently con- 

 tains copper in the state of carbonate or silicate, which gives it a green 

 color, associated with hydrous phosphates of alumina. As far as could 

 be seen it is much more irregularly distributed throughout the vein mate- 

 rial than in the carbonate mines generally Copper ore similar to that of 

 the Highland Chief is found in the Little Johnny (F-29) and Rattling Jack 

 (F-28). The upper White Porphyry comes in again at these shafts, the 

 intermediate ones, like the Uncle Sam (F-32 and I'^-oS), having found vein 

 material directly beneath the Gra}- Porphyry. From the thickness of lower 

 White Porphyry shown in the Eliza shaft, it may be assumed that on the 

 line of this section the entire mass of While Porphyry has gone below the 

 Blue Limestone horizon. 



Colorado Prince group. — The lower formations, which form a clitf face over- 

 looking South Evans gulch between the Highland Chief mine and the Col- 

 orado Prince fault, have been exposed b}* numerous mine workings. Tliese 

 have been exploited in such an irregular and intermittent manner that it has 

 been impossible to obtain satisfactory data as to the amount or quality of 

 ore extracted from them. The geological structure shown by the various 

 shafts and tunnels that were examined is, however, interesting, showing the 

 rising of the beds over the South Evans anticline and the slight displace- 

 ment caused by the Coloi-ado Prince fault. Just above the Colorado Prince 

 tunnel there is an actual rock outcrop of White Porphyry and overljing 

 Lower Quartzite, forming a steep cliff; but, on the shoulder above, the rock 

 surface is deeply buried under the Wash, a relic of the lateral moraine of 

 the South Evans glacier. The following diagram shows an ideal section, 

 drawn through the Colorado Prince tunnel (G-43) and shaft (G-47), and 

 the shafts of the Miner Boy, No. 3 (G-48), No. 1 (G-50), and No. 2 (G-51). 

 The Miner Boy or Kentucky tunnel (G-42), which is a little beyond the 

 line of the section, is indicated in dotted lines. 



