Revieics — Geological Surcey of South Australia. 31 



ranges ; others traverse the valleys between. The proportion of 

 gossany quartz and iron ore fonud in them is considerable ; the gold 

 is found in both in a very finely-divided state. The lodes are strong 

 and extend for long distances, and will doubtless be found to continue 

 to considerable depths when followed. Very little work, however, 

 Las been done to the greater number of the claims, which have pro- 

 bably been taken up for speculative purposes. A few miles west- 

 ward galena containing on assay 12 ozs. 14 dwt. 19 grs. of silver 

 per ton has been found in an excavation a few feet deep on a ferru- 

 ginous quartz lode. Of four assays of gossany quartz from the main 

 line of reef, three contained only traces of gold, while the fourth 

 yielded at the rate of 2 ozs. 12 dwts. 6 grs. to the ton. 



" The countr}-^ near Nellingho, Koonamore, and Waukaringa is all 

 likely country for alluvial gold, which, however, does not appear to 

 have been looked for to any extent, the absence of water preventing 

 prospecting operations. From the general character of this country 

 it is not likely that boring for artesian water will prove successful, 

 for reasons set forth in report by Mr. Brown of April 9th, 1883. 



"North-eastward from Waukaringa the rocks are a continuation of 

 the same formation; calcareous varieties are, however, more frequently 

 met with ; they are capped' in places by quartz gravel, similar to the 

 Pliocene gravel of other gold-fields. 



" About twenty-two miles from Waukaringa granite country begins, 

 and continues eastward to Mingary Creek, alternating with areas of 

 metamorphic and other slaty rocks. In the granite of the Ethiendua 

 Hills, veins of quartz, hematite, and slate occur. Two miles S.E. 

 of Mount Victoria, a copper lode has been found, and is being 

 prospected and ore raised from a shallow depth ; specimens of 

 gold are found in the ore and quartz from the mine ; the lode lies 

 parallel to a dyke of soft bluish granite and decomposed serpen- 

 tinous clay traversing hard granite of the ordinary kind. These 

 soft granitic dykes in granite are not uncommon here, and are 

 indicated on the surface by smooth road-like spaces between rough 

 boulders of granite. Mica schist bands also occur in the granite 

 and occasional veins of quartz. The alluvium is charged with 

 magnetic iron sand. From Mount Victoria to within sixteen miles 

 of the province boundary the country is granitic and metamorphic, 

 the granite being in masses over a large area and in dykes traversing 

 mica slate and clay slate. Near Boolcoomatta there are hornblendic 

 and micaceous gneissic rocks, with coarse granite dykes and green- 

 stone. A quartzose sandstone and felspathic rock has been excavated 

 here and crushed for gold ; it is stained with green and blue carbonate 

 of copper. Eastward of this place vertical cleaved clay and mica 

 slates strike N.E., associated with quartz and iron ore lodes, green- 

 stone, and granitic dykes. Afterwards granite again appears and 

 dips under extensive plains near Mingary Creek, which continue 

 thence to the boundary of the province. Water has been found by 

 sinking in all the formations met with on this route at comparatively 

 shallow depths, from the sandstone and purple shale formation down 

 to the granite and metamorphic rocks. 



