234 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 4, 



not being marked by any metallic appearance. Indeed, the only 

 peculiarity I have observed in any of them is the presence of rose- 

 quartz in considerable quantities near Steinkopf. 



The dip is not, however, continuously north or south in these 

 tracts of country ; numerous axes, often coinciding with the strike 

 of the country, or nearly so, but occasionally at angles to it, interrupt 

 the main dip for from 5 to 50 or even 100 paces, and in these axes 

 the metalliferous deposits occur. Springbok and Copperberg are in 

 southerly dip, the latter with a N.W. axis, 6 yards broad, meeting 

 it ; Concordia, Kelduner, No. 6 Hooklip, Rietberg, and many others 

 in northern dip ; Windhoek and many others in southern dip ; and 

 most of these axes concur with the strike of the country. Een Riet 

 and Spectakel are N.W. axes, cutting the main strike; the former at 

 a small angle, the latter at a considerable one. Nabobeeb has a 

 structure which I suspect to be more common than I have had 

 opportunities of observing. The main dip of the country is northerly, 

 and a metalliferous axis occurs which appears to divide into three as 

 it runs up the hill ; but I have not made the whole structure out 

 very clearly, never having had more than an hour or two to examine 

 it. About 400 yards to the south-east of this division (a consider- 

 able metallic deposit occurs close to the division, which has been 

 worked, and has produced a ton or so of good oxide of copper), a 

 good-sized hill occurs, * which presents extensive brown and green 

 stains "indication." The hill is perhaps 600 feet above the level of 

 the spot just mentioned, and may be 300 yards across. Standing on 

 its northern point, near the summit, I found myself on the junction 

 of two axes, the one taking a direction about 60° east of north, the 

 other about 30° west of north, and therefore coinciding with the 

 present magnetic meridian, and also nearly cutting the spot where 

 the threefold division already mentioned occurs. The place has not 

 been worked yet ; we can therefore say nothing as to its productive- 

 ness. I have said that I believe this meeting of two axes to be 

 more common than I have the means of marking decidedly. I have 

 found it at Copperberg, at No. 12 at Concordia, and, I believe, at 

 Springbok Fontein; but the surface-rock has here undergone so 

 much change, that it is difficult to make out the exact structure. 



Previous to writing the above, I had been led to believe that 

 the "run" on which the mine of the Enterprise Company (about 

 twelve miles nearly east of Springbok) was situated was a continuation 

 of the Springbok "run;" but since then I find by examination 

 that the main dip of the country was there northward, and the 

 changed one south. So that, if this be really the continuation of the 

 Springbok *' axis of disturbance," it must cross the main axis of 

 change, and cannot be, as I have hitherto regarded it, coincident 

 with the strike of the rocks. The distance is nearly ten miles on 

 the line of strike. Springbok Mine lies about half a mile south of 

 the axis of change, and the Enterprise half a mile north of it. In- 

 deed I begin to doubt whether any of these axes really quite coincide 

 with the strike of the country ; but, if they do not, the angle they 

 make is so small as only to be measured by a theodolite. 



