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(Mr. O’Brien) of the occurrence of the gold shoots in the quartz vein, it is safe 
to say that they occur only where the quartz intersects a lead-coloured clay 
slate in the immediate vicinity of these faults. Four faults are exposed in 
the Matrix tunnel. Three of them are clean cut—there is no dragging of the 
edges of the beds ; the fourth carries between its walls 6 inches to 2 feet of 
fault rock, and displaces the strata considerably. It would seem that it is 
only to the eastward of—that is, under—this fault that payable gold has been 
found; the fault dips 48° to 60° W. Mr. O’Brien informs me that none of 
the workings on the western side discovered payable gold. Fig. 15 shows the 
positions of these faults; the main one is apparently younger than those 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Figs. 15,16,17.—Transverse Sections showing Positions of Faults in the Matrix Tunnel. 
Scale, 20 feet to 1 inch. 
marked Snow’s break and West break, which traverse the strata generally 
in a vertical direction, and parallel in strike to the synclinal axis. The 
vein worked by the Matrix Keef syndicate varies in thickness from 
2 inches to 12 inches. In places it throws down spurs, giving 2 feet to 3 feet 
of crushing material. It dips to the west at an angle of 40° to 50°, crossing 
the strata which in the tunnel dip east at 50° to 60°. Its line of intersection 
with the strata pitches 12° N., and is identical with the pitch of the syncline. 
The shoots of gold are small, irregular and discontinuous, but remarkably 
rich. The vein between the shoots is quite barren, or at any rate does not 
exhibit visible gold. 
The work performed by the present claim-holders consists in extending 
an old tunnel 100 feet from Snow’s shaft (see Fig. 13). About midway along 
this drive a rich patch of specimens was met with. The quartz containing 
the gold is highly ferruginous, and the gold is of very high quality. The 
specimens which were valued at £800 occurred between the West and Snow’s 
breaks, and were confined between the floor of the tunnel and a line about 
2 feet above it. As the longitudinal section (Fig. 13) shows, the tunnel (180 
feet in length) up to the spot where the last shoot was found, followed the 
quartz vein down the angle of pitch of the country. Beyond this shoot the 
