42 
but there are no reefs, then there is no gold; but if the dykes cut through 
productive beds and reefs intersect the dykes, then gold occurs along the 
intersections of the reefs and the dyke. If the dyke is faulted, then 
along both contacts of the faulted dyke with the reef gold occurs. 
(See Fig. 7). 
On the other hand, if dykes occur in the barren zones of country and 
they axe intersected by reefs there is no gold, and it is probably owing to 
this distinction between the productive and barren zones of country rock 
being overlooked that the dykes are locally looked upon as unreliable guides 
to the golden quartz. 
Some extremely interesting features in connexion with the dyke 
occurrences are met with in the New Home Rule mine, near Knock wood, 
and New Alabama, near Ten-mile, &c. Dykes are associated with many of 
the Jamieson mines, and where they have not been observed it does not 
follow that they do not exist. They may have been missed in the working, 
but still have influenced the gold occurrences. Their direct relation to the 
occurrence of gold in many of the mines is very obvious. 
Another very important feature on this gold-field which requires to be 
fully grasped in carrying out mining operations is that the country rocks 
are bent into a series of anticlinal and synclinal folds. Along these anti¬ 
clines saddle reefs are met with, and they have been worked at such mines 
as United Gleeson's, the Star of the West, near Ten-mile, the Blue Ribbon, 
&c. The most extensive workings on saddle reefs have been at the 
United Gleeson’s mine, and at this locality a great deal remains to be done 
in exploring for other reefs below those already worked which have 
produced a great quantity of gold. 
Up to the present systematic search for other saddle reefs does not 
appear to have been undertaken. The same methods as are employed at 
Bendigo for exploiting the country for saddle reefs are applicable to this 
field. The saddle reefs in Gleeson’s leases are of large size, and the 
“ legs ” of quartz are many feet'in thickness. 
The two diagrams below indicate the structural features of the field. 
Fig. 6 shows the folded Upper Silurian slates and sandstones before the 
faulting, intrusion of dykes, and formation of quartz reefs along the 
faults. 
/ 
Fjg. 6. 
