GEOLOGICAL REPORT. 93 



(C.) 



PARK'S COPPER MINE. 



I am indebted to Mr. J. V. Phillips for a full report, illustra- 

 ted with numerous sections and maps, upon the Copper Mine 

 of Mr. Andrew Park, in Sec. 17, T. 40, R. 1 E., Washington 

 county. I regret that I can not publish it in full, as it would 

 not be intelligible without the sections. From it I make the 

 following summary and extracts : 



" The vein is in the upper part part of the 3d Magnesian Lime- 

 stone, and appears to run parallel with the strata, which dip 

 about 10 toward the center of the ridge. It is seen on the 

 sides of the ridge in several places for more than a mile in ex. 

 tent, and has been opened in three localities ; in one, the level 

 was extended fifty feet on the lode. The vein contains the 

 green and blue carbonates and the yellow and gray sulphurets 

 of copper, in a gangue of clay, heavy spar, calc spar and oxide 

 of iron in cherty matter. 



" Mr. Park, who had charge of the mining operations, thinks 

 the vein showed a disposition to open out, about every eight 

 feet, in vertical seams or crevices. These openings are filled 

 with decomposed flint and ferruginous matter, and are about 

 one foot wide. 



" The ore in all the openings evidently belongs to the same 

 vein, which is horizontal, and will doubtless follow the dip of 

 the Limestone to the center of the ridge ; and each ridge may 

 be supposed to form a copper basin, and the central basin to 

 be the center from which these ridges radiate. The richest 

 portion of the vein or deposit may be looked for near the cen- 

 ter of the basin. There is evidently a large amount of copper 

 ore in these basins, and it lies in a good position for economical 

 mining." 



About ten tons of the ore has been taken out ; it yields 

 about twenty per cent of copper. 



Mr. Phillips estimates the profits on every hundred tons of 

 ore raised and shipped to Baltimore, at $5,950. 



