DUNKIN MINE. 479 



starting about fifteen feet below the Wash and the second near the base of 

 the ore horizon. The third level is in the Parting Quartzite at the shaft. 

 No. 1 shaft was sunk through the underlying White Porphyry to the Whito 

 Limestone, and is connected with No. 2 only on the second and third levels. 

 Old No. 1 shaft found twenty to thirty feet of vein material above the por- 

 phyry. No. 3 shaft found the vein material directly beneath the Wash, 

 and was sunk through it into Parting Quartzite and underlying porphyry. 

 Only the third level connects directly with this shaft. 



The most important ore body occurs between the first and second levels, 

 extending southeastward from No. 2 shaft into the Matchless ground. It 

 averaged from ten to sixteen feet in thickness and perhaps forty feet in 

 width. Both ore body and ore horizon dip to the eastward on this side of 

 the shaft, at an angle of about 15. The drifts from the first level pass, 

 to the southeast, rapidly into a body of black iron above the ore body and, 

 to the southwest, into black iron and reddish silicious iron. At the end 

 of a drift to the south a coarse sand is found at the top of the ore horizon, 

 which in some cases is found to be impregnated with silver, and constitutes 

 a rich ore. The west drifts in the second level, after passing through com- 

 paratively barren vein material, cut diagonally across the parting sheet of 

 White Porphyry, which has already been noticed in the Climax ground, 

 and reach the eastern end of the Climax ore body, immediately underlying 

 this sheet of White Porphyry. The ore here consists of galena and sand 

 carbonates. 



In addition to the ore bodies above mentioned, later explorations have 

 discovered numerous small bodies or patches of ore in the upper part of the 

 ore horizon, immediately under the Wash. An interesting occurrence here 

 was a mass of angular fragments of White Porphyry, cemented together by 

 galena. The rich white sand noticed in the Climax ground was also found 

 here in places. The galena in this mine is generally coarse grained, and 

 sometimes exceptionally rich in silver; as elsewhere its tenor in silver is 

 usually higher than that of the carbonates. A mill run of galena from the 

 upper workings yielded 500 ounces of silver to the ton. 



On the third level no pay ore has been found, but the developments are 

 interesting from a structural point of view. It runs northeasterly through 



