97 
The mica is brown and intensely pleochroic and contains small crystals 
of apatite and zircon surrounded by pleochroic haloes. All stages of 
alteration due to leaching can be observed beginning with the fading of the 
colour and brightening of the interference tints and ending with a colourless 
mica. 
[Report sent in 25 . 5 . 07 .] 
SILVER-LEAD ORE AT PINE MOUNTAIN. 
By E. J. Dunn , F.G.S., Director , Geological Survey. 
The Silver-Lead lode occurs on the south-west side of Pine Mountain 
at the head of Pine Mountain Creek. It is about 1,300 feet above sea-level. 
The Tintaldra Silver-Lead Mining Company is carrying on operations to 
explore this lode. 
The first tunnel was driven on the north-east side of the hill and on the 
south-west side of the creek. First, a cross-cut of 50 feet was driven 
through granite country to the lode, then a vein of fluorite, quartz, &c., 
3 feet thick was crossed. On the hanging wall there is 6 inches of very 
pure galena, then 30 feet of lode material (siliceous), then another vein of 
fluorite, quartz, &c. 5 feet thick in which there are splashes of galena, 
then 6 feet of lode material (siliceous) and not through the lode. At this 
site the lode is a contact one; it runs along the junction of the granitic and 
Ordovician rocks which consist of altered slate and sandstone beds. The 
lode strikes about north-west and dips south-west at about 66 deg. It 
exceeds 40 feet in width and the south-west wall has rpt yet been reached. 
At the mouth of the tunnel there is abundance of fluorite that has been 
broken out of the lode. It has lumps of very pure galena embedded in it. 
Two hundred and fifty feet N. 30 deg. W. from this first tunnel on 
the south-west bank of the creek and about 150 feet lower in altitude, a 
tunnel is being driven in a direction S. 11 deg. W. It is in 275 feet. 
At 263 feet in, the granite countrv rock was passed through and the lode 
entered. The country rock is porphyritic granite. The lode material is a 
crushed siliceous rock with yellowish-green serpentincus films, and through 
this lode material are veins up to 1 inch thick of purple fluorite with 
occasional specks of galena. Further in the lode larger quantities may be 
expected when the thicker veins of fluorite are cut. This tunnel should be 
continued right through the lode so as to expose its full width. The tunnel 
is about 33 feet above the level of the creek. 
About 300 yards further up the creek a cut has been put into the north¬ 
east bank to the lode. It is about 12 feet deep. The lode is 
7 ft. 6 in. wide at the surface, and at the bottom it is rapidly widening out. 
A shallow shaft 8 feet deep has been sunk in the floor of the cutting on the 
lode, and a great improvement even at that depth is evinced, and much 
galena shows through the lode material and some fluorite veins also ; occur. 
The galena has an altered appearance and has been changed by atmospheric 
causes. Permanent water-level has not yet been reached. 
1 ins is the proper site for testing the lode by means of a shaft which 
should be sunx on the south-west side of the creek. At this point the lode 
is entirely in granite, and northward it may continue in that rock, while 
southward the lode follows the junction of the granite and sedimentary 
rocks. 
