68 Transactions. 



There are, in addition, two small copper-veins and one cinnabar-vein. 



The veins may be divided into groups according to their locality and 

 characteristics, as follows : (1) Glenorchy, (2) Skipper's and Macetown, 

 (3) Carrick Range, (4) Bendigo, (5) Macrae's, (6) Waipori, (7) Barewood, 

 (8) copper- veins, (9) cinnabar-vein, (10) barren reefs and fault-fractures. 



(1.) Glenorchy Veins. 



The chief vein in this district is a scheeUte-bearing vein, which I have 

 ■described in a previous paper.* 



(2.) Skijiper^s and Macetown Veins. 



The veins of this district are mineraUsed shear-zones rather than flssu^re- 

 veins. The country rock is a soft, finely laminated mica-schist, traversed 

 by broad belts of fracturing. Along these belts the rock is sheeted or divided 

 by several parallel fissures, the intervening schist being crushed and con- 

 torted, and more or less altered. These planes of fracture served as channels 

 for the mineralising solutions, which caused the formation of segregated 

 lenses or blocks of quartz. These blocks are of varying size and value. 

 The gold is mostly fine and free, and the adjacent shattered schist or lode- 

 formation is impregnated ^N-ith ppite. 



The Shotover, or Nugget and Cornish, Vein. — The country rock strikes 

 north and south, and dips to the west at from 30° to 45°. The vein, striking 

 north-west and dipping south-west at about 60°, crosses the Shotover River 

 about two miles above Skipper's Point. At the river-bank there are two 

 veins, the eastern and the western, about 100 ft. apart. These two merge 

 into one a short distance up the hill, and the single fissure-Une has been 

 traced across the ranges for some miles to the north-west. On the south- 

 east side of the river the two outcrops are distinctly seen, but only the eastern 

 has been traced for any distance. This runs over the dividing-range, ap- 

 parently in hne with the Premier reef of Macetown. 



The vein is typical of its class, two main fractures constituting respectively 

 the hanging and foot walls, wdth a parallel sheeting of the intervening belt 

 by subordinate fractures. In the western reef four blocks of quartz have 

 been stoped out. At the junction of the two veins a large block (the No. 1) 

 was stoped for a depth of 250 ft. below the surface. The blocks are generally 

 lens-shaped, and hmited on all sides. They are generally bounded by thin 

 clay partings or selvages, but not infrequently these are absent, and there 



~ ' h f! 



Fig. 1. 

 a. Quartz shoot, h. Veiu-fonuatiou of cruslied schist. 



is a gradual transition from quartz to lode formation. In such cases the 

 quartz " makes" gradually out of the lode-formation, and passes over to 

 a parting or wall, where it wedges out (fig. 1). 



*Finlayson, " Scheelite-deposits of Otago," Trans. N.Z. Inst., 1907, p. 110. 



