(jeoloyy of the Diamond Creek Area. 347 



near Ijy is veiy steep, being 70 deg. or 80 deg. The possibility of 

 these reefs being bedded is not very likely, however, as the bedded 

 reefs iire generally very thin and barren, while these are much 

 wider,! and they are fairly rich. The reef at the 300 feet level 

 dijjs slightly to the east, and cuts across west dipping country. 

 This rqef has been located about 500 feet south from where it 

 junctioi'ls with the dyke, and its departure is about seventy feet 

 from the dyke at this point. A reef Avorked for a short distance 

 on the sui'face tu the south-west of the dyke appears to be the up- 

 ward continuation of this reef. Similar reefs occur in the Union 

 No. 7 level, and in the Diamond Creek 400 feet level. In the Union 

 level above-mentioned, the relation of these reefs to the bedded ones 

 is well seen. The bedded reefs are seen to displace these nearly 

 vertical ones, although the displacement is small, generally a foot 

 or two. Jutsoni has shown that the bedded reefs displace the main 

 reefs in the Warrandyte goldfield. The reefs worked on the western 

 limb of the Templestowe anticline, about three-quarters of a mile 

 south of the Diamond Creek mine, are also probably of the same 

 nature as those near the mine. The strike of the reefs in both cases 

 conforms with the strike of the silurian, being north 15 deg. east 

 to north 25 deg. east. Another reef of this kind was seen in a 

 section in the Maroondah aqueduct just to the west of the Bulleen 

 syncline. The reef is about 16 inches in widtTi, and it has been 

 displaced by a small dip fault. As far as the writer could learn, 

 considerable amounts of gold have been won from these reefs. Near 

 the surface they averaged about one ounce to the ton, and occasion- 

 ally patches giving returns of as much as twelve ounces to the ton 

 were found. 



Bedded veins. — These are common at and near the Diamond 

 Creek mine. They have been shown before to occur only in close 

 })roximity to the axial lines, especially the Templestowe anticline. 

 The veins are generally thin, varying from ^ inch to 2 inches in 

 casts of friction striae are well preserved in the quartz. 

 In some places the quartz reefs give place to a small 

 fissure filled with gouge or fiucan. The relation of these 

 veins to tlie dyke is i-athor obscure. Nowhere do they 

 cut across the dyke, although occasionally the reefs have 

 been traced on either side of it. These reefs, as far as the writer 

 is aware, contain little or no gold, and their effect, if any, on the 

 localisation of the gold in the dyke veins, is not appai-ent. The 

 striae on the cjuartz show that the movement that has occurred was 

 mainly a slip in the direction of the dip of the dyke. 



1 1-, p. n36. 



