IX RELATION TO MINING POLICY. — \V001)Mx\N. 178 



the folds are not syinnietrical, they are not highly overturned. 

 The slates have a strong secondary cleavage dipping 65 

 degrees east, so that on one side of the fold it is parallel with 

 the bedding, on the other transverse to its dip. This explains 

 the " false saddles " so conunon there, which have no analogy 

 in this country-. Unlike the Nova Scotian cases, the dips are 

 constant on either side, giving steep straight shanks and narrow 

 sharp crests. This corresponds to what we have on only our 

 narrowest folds. Conditions analogous to Goldenville, Mt. 

 Uniacke, Renfrew, and many other districts do not exist in the 

 Australian held. The leads of Bendigo often lie, too, in " inverted 

 saddles." Indeed, the whole dynamic condition of origin was 

 different there from that in our own series ; and dynamic history 

 in such cases has great influence upon profitable mining methods. 

 The rocks there were evidentl}" under much less weight of 

 superincumbent material, or were more rapidly deformed when 

 folding took place : for the sharp folds have allowed far more 

 slipping of sandstone and slate past each other than with us. 

 The result has been a series of saddles which individually are 

 very thick on the crest, narrow rapidly downward, and die out 

 for the most part within a few hundred feet. 



On the average, one-half the saddles in Bendigo pay. Their 

 vertical interval is very variable. In the New Chum and 

 Victoria mine, 30 were passed in 2300 feet ; while in " 180 " 

 mine only five were cut in 2500 feet, two of them lean. 

 In the Lazarus, 24 were met in 2400 feet, 13 gold-bearing. The 

 continuity of single leads along the strike of the folds is unheard 

 of elsewhere, one vein having been followed continuously for 

 ten miles. The deepest mines, over 4000 feet, show ore un- 

 changed in character. But it is to be emphasized that no mine 

 has made a reputation on the basis of a single saddle. In ever}' 

 case vertical sinking has been resorted to, and one saddle after 

 another uncovered, as was brought out in Mr. Faribault's first 

 paper on deep mining. No single leg there has been found to 

 extend very deep. 



