100 GOLD AND TIN DEPOSITS OF SOUTHERN APPALACHIANS. 
There is evidence in other parts of the workings of the vein having pinched and offset, as in 
A, fig. 12. A crosscut tunnel from the northwest passes, at a depth of 60 feet, the point 
where the vein ought to be, without cutting anything but stringers, although the vein occurs 
with normal width on each side of this place on the surface. It is probable that this gap is 
Quartz 
Amphibolite 
Fig. 12.— Diagrammatic sketch plan of vein at Brown mine. A , Vein at surface, showing offset due to 
presence of one predominant joint plane; practically no faulting. B, Vein at depth of 80 feet, showing 
pinching along one plane of foliation and continuation along another; also influence of numerous coor- 
dinate joints in leading the solutions from one main fracture to the other. 
horizontal rather than vertical, for it corresponds in posit ion to a gap encountered in the new 
incline a short distance to the southwest. In sinking this new shaft the vein was followed 
downward at 55° to a depth of about 55 feet, where it pinched out. It had been not iced that 
little joint planes or crevices branched off into the foot wall, so the shaft was steepened; 
