54 
As these faults reach centre-country—anticlinal or synclinal—the quartz 
reef, which may have been many feet across, often diminishes in size, and 
where it is between western walls on both sides may be only an inch or two 
thick. 
The diagram (Fig. 17) represents an anticlinal and synclinal in corru¬ 
gated strata. The dotted line in Fig. 17 indicates the line of fault along 
which fracture and movement will take place. Fig. 18 represents the 
same bit of country-rock fractured, and the portion on the western side 
of the fault as having glided upward along the fault line. The figures 
show corresponding points on Figs. 17 and 18. Lateral pressure appears 
to have caused the fracture and displacement. 
[Report sent in 1st September, ipog.\ 
THE SPRING GULLY MINE, NEAR FRYERSTOWN. 
(NO. 25 ON LOCALITY MAP.) 
By E. J. Dnnn , F.G.S., Director , Geological Survey. 
The shaft, which is sunk to a depth of 589 feet, though the water is 
up to 430 feet, is well placed, as centre-country is 70 feet to the west of 
it at the surface. 
At the 200-foot level the cross-cut to the west is blocked ; the country- 
rocks dip to the east as far as worked, showing that centre-country is to the 
west of the shaft, but the distance is not known. 
At the 240-foot level, in the western cross-cut, centre-country is 62 feet 
west from the shaft. The cross-cut is extended to a total length of 122 
feet, and ends in westerly “country.” All the slate and sandstone has a 
most favorable appearance, and should be productive of gold; in fact, 
throughout the mine the country-rock has this character. At this level a 
westerly strike fault occurs, and along this, where it crosses the beds, a 
great development of quartz has taken place. This reaches as much 
as 30 feet in thickness, and is worked profitablv. A level is driven to the 
south for 420 feet. All the country-rocks pitch to the south. At the end 
of this southern level, and in a cross-cut to the west, is centre-country, a 
well-formed arch; while 30 feet to the west from the centre is the quartz 
“ leg ’ ’ now being worked, which is giving excellent returns. The 
quartz is 1 ft. 3 in. thick, and rising over the saddle. The pitch of the 
country-rocks here is to S. at 15 deg. 
In the first stope above the intermediate level below 240 feet, and 
south of the cross-cut, large spurs of quartz are being worked. Some of 
these spurs are several feet thick, and are giving good returns. Coarse gold 
occurs in them, and a piece weighing 18 dwts. was recently obtained. 
These spurs are all connected with a “ back,” that is considered the eastern 
“ back ” from the western “ leg ” that is being worked in the level above. 
Country-rocks, dipping to east, occur in a western 60-feet cross-cut off 
the No. 3 level at 318 feet to the south of the shaft. Centre-country is 
near the end of the cross-cut. 
At the 430-foot level there is a cross-cut 14 feet to the east of the 
shaft; thence a level has been driven for 100 feet to the north, and a 
cross-cut 45 feet to the west. All are in country-rocks dipping to the east. 
Centre-country is still further to the west. 
