648 J- T. Jutson: 



river breaking through the dam. No details of the results are 

 given, but as the enterprise soon ceases to be mentioned by the 

 Mining Surveyor it was presumably a failure. 



The tunnel was successfully made at the Pound Bend in 1870, 

 and the river diverted through it. Trouble arose through the 

 river finding a new course. This was repaired, but as no de- 

 finite results are stated, and mention of the scheme soon 

 ceases, this must also be regarded as a failure, although gold 

 in patches is stated to have been distributed all round the 

 bend. Each undertaking must have been expensive. 



(h) Possibilities of Further Development of Quartz 

 Mining. 



Thei'e are two phases to this question. First, whether any 

 horizontal extension of the field is likely, and secondly, the 

 prospects of payable stone at greater depths than hitherto 

 worked at the present-known reefs. 



The first aspect must be answered in the negative. The 

 geological structure of the field indicates a close connection be- 

 tween the highly folded area and the quartz reefs. This area 

 is limited to Warraudyte, so that beyond it, the fractures neces- 

 sary for the formation of the reefs would not be expected, and, 

 so far as observation goes, this is correct. 



Mr. Moon, on the Quarter Sheet already cited, and Mr. 

 Whitelaw on his map of part of Nillumbik Parish, show a 

 moderate number of quartz reefs outside the Warrandyte area. 

 The writer has not seen all these reefs, but those inspected, so 

 far as could be seen, are thin, irregular, and generally in locali- 

 ties where the geological structure of the country does not 

 favour any system of fractures. Some of these reefs have been 

 slightly opened up, but the prospects were evidently unfavour- 

 able. The development of some of them may also have been 

 hindered by being on private property, and some may exist that 

 if worked would be payable. Gold has been found in gullies on 

 the northern side of the river at Warrandyte. This may have 

 come from isolated reefs, or the dykes, or from the gravels 

 under the basalt at Kangaroo Ground, or from all three. 



