168 
The special interest attaching to this mine is that it is situate on the 
syncline, and is about midway between the Thistle and Christmas lines of 
reefs. These two lines of reefs are on the anticlines. 
At Bendigo, workings along the synclines are the exception; the anti¬ 
clines have monopolized most of the mining. Judging from the results 
obtained at this mine, and at one or two other sites, as well as from the 
rich trough reefs worked at Lauriston and elsewhere, it seems quite 
probable that the lines of syncline have been too much neglected. The 
results obtained at the Langdon mine should encourage prospecting on 
the synclines. Should further work prove that the synclines are worth 
exploiting for gold, it would practically mean doubling the lengths of 
the available lines, and, as the synclines have not hitherto been mined, 
the work would begin at the surface. As previously pointed out, shafts 
sunk along the synclines will have to contend with far more water than 
those along the anticlines. 
[Report sent in 2i.g.o8.\ 
THE NORTH LANGDON MINE, BENDIGO. 
By H. S. Wkitelaw. 
The shaft of the North Langdon Mine is on the south side of Tip¬ 
perary Gully, about 610 yards north of the Langdon Mine, and 4 miles 
south of Bendigo. At the surface, the Langdon syncline is 140 feet to 
the west, and the Thistle anticline 330 feet to the east. The ground 
being re-opened by the North Langdon Company was rather extensively 
worked about 40 years ago by the Great Hope Company, and is com¬ 
monly supposed to have proved one of the richest portions of the Diamond 
Hill section of this gold-field. The work of unwatering, enlarging, and 
re-timbering the shaft is still proceeding, but I was able to inspect por¬ 
tions of the old workings at the 170 foot, 220 foot, and 280 foot levels, 
and the strata exposed in the shaft between 310 feet and 316 feet below 
the surface. Until other sections have been exposed no safe generaliza¬ 
tion can be made, but from the little that can be seen it would seem that 
the shaft was sunk to cut the downward continuation of a quartz reef 
associated with a fault (crosscourse) which outcrops between 50 feet and 
60 feet to the north-east. The wall of this reef strikes north-westerly 
and dips to the south-west at 80 deg. The effect of the crosscourse on 
the country within the lease is not plain, but that the vertical displace¬ 
ment is considerable is suggested by the flutings in the wall of the reef 
at 280 feet, and the sharp reversal of the pitch of the Langdon syncline 
where intersected by it. At this point on the surface the normal pitch 
of about 5 deg. N. becomes one of 40 deg. S. Beyond this spot, in a 
north-westerly direction, the crosscourse follows the course of Tipperary 
Gullv to the Christmas anticline, which it somewhat distorts. In sinking 
the shaft a west dipping back was cut at 130 feet carrying 6 inches to 10 
inches of laminated quartz, which, as it has been worked for a short length 
to a depth of 280 feet, was probably auriferous to a payable degree. 
About 60 feet to the east of this leg another west dipping reef (called 
the east leg) has been worked from 220 feet to 280 feet (to what height 
above and depth below these levels is not known). This reef cannot now 
