ENDLICH.] 



GEOLOGY CARIBOU LODE. 301 



tite, pyrargyrite, and native silver; quartz mainly forms the gangue- 

 rock, small amounts of feldspar also occurring. One of the western 

 levels shows a very curious dike of granulite of 12 feet thickness, run. 

 ning across the vein at a right angle, without occasioning any disturb- 

 ance or dislocation, however. The Caribou is intersected by the 'No 

 Name on the east, and the Seven-Thirty on the west side, at an angle of 

 about 30°. In both these interesting lodes, the ore is of a similar char- 

 acter, and they show no dislocations. 



Of minerals the following were found : galenite, sphalerite, argentite, 

 in small crystals and massive; fahlerz, massive; pyrargyrite; native 

 silver, in wire form and leaf form ; chalcopyrite, cerussite, and mala- 

 chites ; the latter two as the result of decomposition. 



Two shafts are sunk on the lode, connected underground by levels 

 and drifts, and at present a tunnel 700 feet in length is being driven in 

 from the north to strike the vein. This will greatly facilitate the ex- 

 traction of ore. Thus far the greatest depth reached in the mine was 

 370 feet. 



The Ko Name lode, striking north 20^' east, intersects the Caribou 

 east of the shafts, showing a considerable dip to the north. Walls are 

 well-defiued, granitic, and the thickness of the vein between them from 

 3 to 6 feet. Calenite and sphalerite, with argentite and fahlerz, con- 

 stitute the main body of ore. Besides these minerals, chalcopyrite, 

 wire-silver, cerussite, azurite, and malachite are found. At the time of 

 my visit, a depth of 117 feet had been reached. 



A large number of other lodes, highly spoken of, were being claimed 

 and opened at the time, but the expected opportunity of visiting the 

 place in October again did not aftbrd itself, and no information regard- 

 ing them has j?eaclied me. 



PAET IV. 



Annexed is a report of Dr. A. C. Peale upon the mines which he 

 visited during the summer of 1873, and he has kindly permitted his notes 

 upon them to be placed in connection with the above report. 



MINES NOTED BY THE SOUTH-PAEK DIVISION OF UNITED 

 STATES GEOLOGICAIi SURVEY, 1873. 



By a. C. Penile. 



TAERYALL CREEK. 



There has been considerable mining done along Tarry all Creek, but 

 at present little work is in progress. One great disadvantage is the 

 scarcity of water. It is only during the sj^ring and early summer that 

 there is sufficient water for mining purposes. Above Hamilton the 

 gravel rests on sandstones for the most part, and is from 10 to 20 feet 

 thick. The following are two of the principal claims : 



Tarrycdl, Eiihhard, and Snafferd. — Tliey have two flumes, the average 



