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THE LADY NELSON MINE, ST. ARNAUD. 
By E. J. Dunn , F.G.S., Director , Geological Survey. 
This mine is about i mile north of the Post-Office, St. Arnaud. The 
rocks consist of grey sandstone and slate; they strike about N. 35 deg. 
W., and dip west. A shaft has been sunk to- 800 feet from the surface. 
East of the shaft is a low ridge, and rising about 20 feet above the surface 
of the ridge is a massive outcrop of quartz known as the Sebastopol Rock. 
At the 203-ft. level, and 50 feet from the shaft in the west cross-cut, 
a “back” occurs that has a strike of N. 20 deg. W., and that dips 
W. 85 deg. At 60 feet west is a barrel-shaped roll in the beds with a 
little quartz over it; the pitch is south at 85 deg. The rocks forming this 
roll consist of black slate and grey sandstone. In a short level driven 
along the roll southward the beds consist of black slate and grey sand¬ 
stone dipping W. at 85 deg. The quartz reef was worked along the level 
northward from the shaft. At 80 feet north is a rise connecting with 
the 100-ft. level.' At 90 feet, a winze was sunk connecting with the level 
below, and a cross-cut was driven east for 16 feet, and here the beds dip 
east. This north level is along the lode channel, and the reef was worked 
at the north end right through to the surface. From this level the shoot 
was nearly vertical up to the surface, although the general pitch of the 
shoot is southward. 
At the 274-ft. level, the reef channel is about 10 feet west of the 
shaft. The beds dip west at 85 deg., and the lode channel appears to 
conform generally to them. At this point the channel is about 
2 inches thick. Northward, the reef gradually thickens. At 100 feet 
north, a winze connects with the level below. The reef v r as stoped out 
overhead and underfoot. Further northward, a curious admixture of black 
slate and quartz occurs, and forms a rounded mass j this was too poor 
in gold to work, and is not a saddle reef. Adjoining this abnormal mixture 
of quartz spurs and black slate the foot-wall shoot has been worked through 
to the level below and right down to the 700-ft. level. The pitch is south 
at a high angle. 
At the 364-ft. level, the reef channel was cut at 20 feet west of the 
shaft. The country dips west at 80 deg. At 70 feet in the cross-cut 
west from the shaft another quartz reef 5 feet wide was cut j much country 
rock is mixed with the quartz, and it is too poor to work. At 80 feet 
south from the shaft the reef is stoped for 30 feet in height and for a 
length of 60 feet. In the level, 20 feet west of the shaft and 50 feet 
foot. 
Art the 464-ft. level, the country dips west about 70 deg. The reef 
channel is cut at 60 feet w 7 est of the shaft, and at 30 feet north of the 
cross-cut the quartz is stoped up to the level above and downwards. The 
shoot w r as about 60 feet long. 
At the 562-ft. level, the country dips west at 70 deg. At 100 feet west 
from the shaft in the cross-cut the reef channel w r as cut, and the quartz 
has been stoped overhead and underfoot. To the north of the cross-cut the 
stopes extend for 35 feet, and to 20 feet south of the cross-cut. 
At the No. 7 level, and at 130 feet west of the shaft, the cross-cut 
intersects the reef channel. The shoot of auriferous quartz w r as stoped 
for 40 feet north of, and for 10 feet south of, the cross-cut. The w r est 
cross-cut is extended a total distance of 210 feet from the shaft, the last 
80 feet in country rock. The beds dip west about 70 deg. throughout 
the cross-cut. 
