43 
The next figure illustrates the present structure and the conditions 
under which the gold occurs. The Upper Silurian slate and sandstone 
beds are folded into a series of anticlinals (A) and synclinals (B). Certain 
zones (C) in these beds are productive of gold, others, (D), are barren. A 
dioritic dyke (E) cuts through all the beds both barren and productive. 
Subsequent faults (F) have cut through the dyke and are now occupied by- 
quartz reefs (G). Where these reefs, are in a productive zone and in 
contact with the dykes (H) they are auriferous. After the formation of 
the reefs flat faults (J) have displaced them. 
On this gold-field the tunnel phase of mining still holds, and only in 
one or two instances have shafts been sunk to lower levels, so' that experi¬ 
ence has not proved wbat the gold-field is likely fi> be in depth. So far as 
sinking has proceeded the results are favorable, and there does not appear to 
be any valid reason why the mines should not be productive as depth is 
attained. There is the one. encouraging example of Walhalla, where the 
conditions are very similar and rich yields of gold are obtained from depths 
of 3,500 feet and more. The Jamieson gold-field deserves to be thoroughly- 
opened up in depth, and it should become a large contributor towards the 
gold yield of the State. A geological survey of the surface and proper 
under-ground surveys of the mine would greatly^ assist its development. 
The'Champion Mine, Ten-Mile. 
The tunnel at the Champion mine runs in from the east side of the hill 
in a direction W. 5 deg. S.' The rock consists of Silurian slate and 
sandstone dipping west at the tunnel mouth. Three hundred feet in, the 
Champion reef was cut. The reef is a “ leg” conforming in strike and 
dip with the country. It is from 3 to 12 inches thick, and the quartz carried! 
6 ozs. of gold per ton at the surface. The dip of the reef is 52- deg. W., 
strike N. 10 deg. W., pitch N. at 30 deg. It has been stoped along 
