282 
THE GEOLOGIST. 
main dip was north and the disturbed one south — the strike of the 
rocks being nearly east and west. (Sec. 1 and 2). 
Dip South. Dip North. Dip South. 
Fig. 1.— Spring Bok Vontein. 
Dip North. 
Fig. 2. — Concordia. 
The ore is chiefly copper, with a good deal of iron, a little molyb- 
denum (sulphuret), an occasional film of gold, and in one instance a 
lump of tungstate of lime. Oxides, silicates, and carbonates occupied 
the fissures and the upper parts of the pipe-veins, those, viz., where 
the surface-action was greater. Black, purple, and yellow sulphurets 
succeeded at first in good quantities ; but lower in the excavation the 
gneiss became mere felspathic, less fissured, and at length assumed the 
form of a felspathic grauite, in which only specks of pyrites were 
observable here and there. Meeting these saddles, whose anticHnal 
line coincided, or nearly did so, with the strike of the rocks, were 
twists of the strata, figs. 3 and 4, crossing the strike at various angles, 
one of which, a horizontal section, appeared on the surface near its 
junction with the metallic saddle of Koperberg, and had the appearance 
