APPENDIX. 



(A.) 



THE CASSWELL MINE. 



Since the foregoing report was written, I have had the pleas 

 ure of visiting this valuable mine in company with the lion, 

 John P. Darby, one of the proprietors. It is situated on the 

 N. J of the S.W. qr. Sec. 34, T. 42, R. 1 E., in the bluff of the 

 southern side of the Meramec. At the mine the bluff rises 

 rather abruptly to the height of some 200 feet. The rocks at 

 the base are the upper beds of the 3d Magnesian Limestone, 

 and those cropping out on the brow of the hill, near the top, 

 arc the lower beds of the 2d Sandstone. 



The vein was discovered in the fall of 1855 by Mr. Brewer, 

 who opened the mine and raised about 12,000 pounds of gale- 

 na. It was next worked by Mr. Erie Standifer, who took out 

 some 15,000 pounds of the ore. Mr. Michael Dolan has worked 

 it from time to time since 1856 under the direction of the pres- 

 ent owners, Messrs. Darby, Vandeventer and Beardslee, and 

 has raised about 100,000 pounds of good galena. 



Mr. Dolan's systematic operations very clearly indicate the 

 characters and value of the vein. It cuts through the bluff in 

 a direction nearly north and south, and almost perpendicular, 

 but inclining a little to the east in its descent. The lead ore 

 is nearly all the sulphuret, though the carbonate sometimes 

 occurs. The gangue is heavy spar, calc spar, and red clay. 

 The thickness of the vein varies from two inches to ten. This 



