l8l 



been worked to a vertical depth of 300 and 400 feet (90 

 to 120 m.). A shoot on the Hard lead, South Uniacke, 

 was followed 1,200 feet (360 m.) on a dip of 28 east; 

 while that in the Sterling Barrel lead, Oldham, has been 

 worked to a depth of 1,610 feet (487 m.) on a dip varying 

 from 30 at the surface to 43 at a vertical depth of 900 

 feet (275 m.), and in 1909, the ore averaged 2-88 ounces 

 per ton. The latter is the deepest mine on an interbedded 

 vein. 



Several shoots in cross veins have also been mined to a 

 vertical depth of 200 and 400 feet (60 and 120 m.), and 

 two, to a vertical depth of 1,000 feet (300 m.) ; one of 

 these was worked throughout a length of 2,000 feet (610 m.). 



As a rule, ore-shoots occur in the rolls that have been 

 already described, that is those parts of the veins in which 

 there is some irregularity in size, form, structure or com- 

 position. 



The interbedded leads are frequently found to be very 

 rich at their intersection with angulars as well as in the 

 thickened parts lying between the lines of intersection 

 with angulars from below and above. All angulars do 

 not enrich the leads they cut, and frequently only a set 

 coming from some one particular direction have favoured 

 the enrichment of the leads. The angulars themselves 

 are usually not auriferous, but some have proved gold- 

 bearing, especially in those parts where they cut obliquely 

 across slate beds. 



There is much irregularity in the distribution of the ore 

 in belts; in some, all the veins are auriferous, in some, 

 only one, and in others, one vein will be auriferous for 

 some depth, then becomes barren and an adjacent one 

 becomes auriferous. 



That there is some order in the distribution of the ore- 

 shoots was pointed out by Poole as early as 1878. A 

 study of the plans made by Faribault of the different 

 gold districts, reveals an alignment or arrangement of 

 the outcroppings of the ore-shoots in nearly every district. 

 In the case of sharply folded anticlines, the line of ore- 

 shoots runs roughly parallel with the axis or diverges 

 slightly from it, radiating from the centre of the dome, 

 while in broad folds the line diverges still more from the 

 axis. The shoots pitch in the general direction 01 tne 

 pitch of the anticline and at about the same or a little 

 higher angle. 



