130 
where its outcrop is covered by surface deposits. Its general strike is 
N.W. by N., and its dip (below 200 feet) to the south-west at 64 deg. 
to 83 deg. ; above 200 feet its dip is to the north-east at 78 .deg. to 
89 deg. The walls, which are usually smooth and firm, are seldom 
parallel for any considerable distance, and, consequently, the reef in 
different parts varies in width from 1 foot to 24 feet. The reef material 
is composed of greyish-white quartz and crushed and altered country rock. 
The quartz occurs in the form of shoots, in some places filling the entire 
space from wall to wall, as in the upper levels; in ethers confined to smaller 
limits, as, for instance, in the lower levels, where the bulk of the vein¬ 
filling between the walls (which are in places 20 feet apart) is silicified 
country rock. The shoot (called tl The Mass ”) worked in the Lady 
Nelson Mine was 60 to 100 feet long, and of an average width of about 
5 feet. Little is known as to its value between the surface and 200 feet 
in depth, but it is stated to have been richer than the portion below water 
level. The records supplied to me by the legal manager (Mr. J. A. Thorn) 
show that 10,889 tons crushed since the company was formed in August, 
1903, yielded 3,565 ozs. of gold, an average of about 6 dwts. 13 grs. 
per ton. The shoot was payable, and has been worked out to No. € 
level. Below that it has been prospected at No. 7 level where the foot wall 
has been driven on 40 feet south, and the head wall 100 feet; and at No. 
8 level where the foot wall has been driven on 270 feet, and the head wall 
cut across to at intervals. The yields from these levels were disap¬ 
pointing, the last from No. 8 (the stone broken while driving the level 
south) being 630 tons for 37J ozs. The fissure in which this reef has 
been formed is a line of faulting, and probably extends indefinitely down¬ 
wards. The movements caused by the faulting have in places produced 
a complicated convoluted structure in the slates and sandstones adjacent 
to the reef, and further complications have been caused by slides of small 
throw. At several places along the reef channel a series of rocks thinner- 
bedded than others adjoining them can be seen to be more curved against 
the wall than the massive beds, and at these places cavities have formed 
between the bedding planes, and here bodies of quartz have been 
deposited in forms simulating steeply-pitching saddle reefs. 
The country rock exposed in this mine is composed of closely-packed, 
steeply-dipping Ordovician sandstones and slates, the former vastly pre¬ 
dominating. Over the whole length of the line of section, and some 
hundreds of feet further eastward, there is a persistent dip of the 
strata in a south-westerly direction, and the survey tends to show that 
the country rock of this particular locality is not folded into anticlines 
and synclines in the regular manner in which it is at Bendigo. The 
apparent folding at several levels in the mine is a feature that may be 
ascribed with much probability to a deflection of the normal strike of the 
beds caused by faulting, which has dragged the edges of the strata into 
loops or sharp curves. These loop-like folds are best seen at the 
Nos. 2 and 3 levels. The plan of No. 2 level shows that on the east 
side of Rotten reef and the west side of the fault near the Western reef 
(at 90 feet west of the shaft), the strata strike north-westerly (which is 
the normal strike of the strata of the district), while between these two 
boundaries the beds are contorted, and the strike is deflected so as to run 
almost at right angles to the natural course. It would appear that 
this block of country has, subsequently to' the tilting of the strata, been 
subjected to immense pressure, and the beds enclosed between the two 
faults have been curved and incurved against the walls as the result of 
horizontal drajg. In the main cross-cut at So feet west of tire shaft, a 
