Laserfiche WebLink
<br />change. Concurrent reopening of the vein structures was necessaryr for continued <br />deposition of the ores. and the points of recurrent opening determine the <br />distribution of ore. Base metal sulfides are each more widespread and conslsterrt 1n <br />their distribution than are high-grade gold ores. However. gold does ocar in <br />oreshoots within veins. and where recognizable. the shoots show both steep and <br />shallow rakes to the southwest. This is probably in part the result of geocheadcal <br />factors favoring the deposition of ore, especially gold ores in the upper portions of <br />the veins. but it 1s also likely that changes in wallrock lithology.have had moth to <br />do with the initial rorphology of the vein structures and subsequent changes due to <br />reopening of the veins. <br />., , , \ .~~ <br />.~ ~~~~~ ~ <br />,~ ,, <br />~~ •~ ~ ~ <br />\ ~ surw <br />NOlr[HWESi ~ • \ - \ \ ~ \\ \ 90Uf11EAST <br />~~ <br />~~. <br />,~ <br />~\~ . <br />\~~ <br />GeNa:AUZeo c;Ea.Awc <br />caoss-sECrioH <br />SUNNYSIDE MNNE <br />0 4~)0 <br />uau ^ ra[r <br />S <br />Figure 3 illustrates important changes in vein persistence and attitude along dip. <br />Both the 2150 and Little nary veins dieout updip as the Burns-Henson contact is <br />approached and interbedded volcanic breccla and tuff becooe notlcea.ble within the <br />flows of the upper Burns. There is also a decided change in dip, with the 2150 Vein <br />actually rolling over. Rich gold ore, though very erratic in detail. has generally <br />been confined to the axis of the roll which pitches southwest at aipproximately 10 <br />degrees (figure 4). Gold ore along the Little Nary Vein (figure 5) also occurs 1n <br />gently southwest raking shoots, although unaccoryanied by aqy abrupt changes 1n <br />strike ar dip. <br />6d <br />~+ <br />