204 



Metres" 1 * n a sma ^ r °U increasing in size and value as it 

 pitches 5 to 40 . It has been worked con- 

 tinuously on the pitch for about 1,200 feet 

 (365 m.) across the first fault and as far east as 

 the Whitehead fault beyond which it probably 

 extends farther but has not yet been discovered. 

 On the first fault the roll has an upthrow of 

 about 130 feet (39 m.) and a horizontal displace- 

 ment to the south of 112 feet (34 m.). The 

 thickness of the vein above and below the roll 

 averages 4 inches, whereas it increases in the 

 roll and varies from 8 to 22 inches and may aver- 

 age 17 inches. In the roll the quartz and en- 

 closing slate have a decided roily structure, and 

 vertical sections of the roll have the form of an 

 elongated ellipse, the length or height of which 

 varies from 8 to 18 feet. Small angulars of 

 quartz, sometimes associated with siderite and 

 seldom over an inch in width, branch off from 

 the roll into the quartzite foot and hanging walls. 

 Angulars entering the roll from the hanging- 

 wall had little or no effect on the richness of 

 the ore, but those from the footwall side were 

 decided feeders or enlargers of the quartz above 

 them. It is important to note that the vein 

 dips steeper below the roll than above it, pro- 

 ducing a decided flexure of the strata which 

 may account for the formation of the roll and the 

 angulars during the folding process and the 

 consequent slipping upward of one bed upon 

 another. Outside of the roll the ore had a ge- 

 neral assay value of 3 to 15 dwt. (or $3 to $15) 

 per ton in free gold, whereas the ore of the Hard- 

 man roll itself never yielded less than one ounce 

 per ton, most of it gave 9 to 30 ounces, and 

 sometimes as much as 80 ounces ($1,600) per 

 ton for lots of 8 to 10 tons. The high grade ore 

 was associated with galena and zincblende, the 

 poorer quartz carrying from 1 1 to 2 per cent of 

 arsenopyrite, pyrite and pyrrhotite, all of these 

 minerals being found also in the rich ore but 

 subordinate in amount to the galena and 

 blende. 



