146 
Directly below, in the 460-ft. level, a few tracks bringing in water 
and gas, and one lode track carrying quartz, were cut, but not a prospect 
of gold. 
The 960-ft. level, the next level at which the Old Leviathan Reef 
formation was cut, shows a splendid quartz reef with encouraging pros¬ 
pects, and going strongly under foot‘south. On this new reef, drives X. 
and S. extend for 100 feet each way, and the ore taken out 40 feet 
north and 100 feet soum yielded about 2 dwts. to the ton, 600 tons have 
been crushed in all. 
It is noticeable that at 60 feet west of this new reef there is an 
intrusive dyke 15 feet wide, dipping 60 'deg. east, and as the reef is 
nearly vertical to slightly west, they may meet one another, or one of the 
horizontal offshoots of dyke-rock may pass through the reef, as even now 
much felspar (plagioclase?) is present in the reef. In this district, when 
felspar can be found in a reef, there is always an intrusive dyke close 
by, and generally an adjacent shoot of gold, and, so far, I have noted 
only one exception in the country examined around Maryborough. In 
the New Reef, fairly coarse gold occurred together with zinc-blende, 
copper pyrites, iron pyrites, and galena. I saw this auriferous make in a 
fairly^ large reef formation, and, since my visit, Mr. Nicholas informs me 
that, when left, the reef was 6 feet wide, with a 3-in. vein near the 
middle, ana two good walls. The 3-in. vein carries good gold, and is 
rich in the sulphide ores, as mentioned above. Good specimens from 
the small vein can be seen at the mine. In addition to the two large 
reefs referred to, a true fissure reef occurs between the Western and New 
Reefs. This is very narrow, carries gold and sulphides, and runs nearly 
vertically through the mine workings. At the 960-ft. level, this middle 
reef is hard to locate, but may be on the dyke, where a make of quartz 
occurs, at present of no value. 
These reefs should be developed by sinking and cross-cutting at deeper 
levels, where more settled country under the break should be found. The 
two main vertical dykes accompany the reef formations from the surface 
downwards, and, as the dykes must go down to a. great depth, there is 
every chance of the reefs doing likewise. 
Developments at lower levels, if attended with success, will be of the 
utmost importance to future quartz mining at deep levels in the Mary¬ 
borough district, and have special bearing on a belt extending some miles, 
in which the promising reefs of Mariners’ Hill, Bristol Hill, and the 
North Leviathan lines occur. 
This mine has done good work, having proved gold-bearing quartz 
several hundred feet deeper than hitherto known in this district, and its 
machinery and plant are especially well equipped for deep sinking. 
[Report sent in 16.7.06 .1 
KIRK’S REEF, MARYBOROUGH. 
By E. J. Dunn, F.G.S., Director, Geological Survey. 
Kirk’s Reef is situated in Ordovician slates and sandstones, on Pound 
Hill, about one mile N.E. of the town of Maryborough. The strike of 
the reef is N. 22 deg. W., and it dips easterly at 70 deg. Mr. A. M. 
Howitt pointed out to me that this reef is cut by three nearly horizontal 
dioritic dykes. At 25 feet from the surface a dyke 4 inches thick cut 
right across the reef. The gold contents increased from ij dwts. per 
