79 
(, “ Analyses of this ‘ greenstone’ are given by Mr. Daintree in bis paper on the 
oology of Queensland,”* and by Professor Liversidge.t They ; 
are ; 
Silica ... 
Alumina 
Perric oxide ... 
Ferrous oxide 
Lime ... 
Magnesia 
Potash 
Soda 
Sulphur 
Manganese protoxide 
Carbonic acid 
^ater (constitution) 
Water (hygroscopic) 
Daintree. 
Liverstdgk 
Per cent. 
Per cent. 
... 50-500 
64-952 
... 18-485 
16-643 
... 1-470 
2-410 
... 6-440 
7-849 
... 8-800 
. . . 8-646 
... 8-530 
... trace 
... 0-635 
1-540 
. . 1-655 
6-647 
... 0-190 
... 0-820) 
trace 
... 1-600 1 
... 0-850 j 
By diff. 1-314 
99-975 
100-00 
Sp. gr. 2-752 
Sp. gr. 2-860 
‘ Mr. Allport, of Birmingham, to whom Mr. Daintree referred this rock for 
examination, says : — ‘ This is dioritc, containing hornblende, triclinic 
a little brown mica (biotite), and pyrites.’ 
^ock •nicro-photograph of the section in Professor Liversidge’s paper shows a 
®ade up of particles of other rocks, with fragmentary crystals of felspar, augite, 
mingled with chlorite. This section does not resemble those cut by 
Profe described above ; and I am under the impression that the rock described by 
d'iversidge as an altered ash or breccia is one of the green fragmentary 
^•opov reefs actually in contact with the ‘greenstone’ have become 
have and do not contain gold in payable quantities, it nevertheless appears to 
fgj. a favourable influence on the auriferous character of the shales in its vicinity, 
w^only in these beds that the reefs have contained payable gold. 
Upper b iu the great mass of shales which lie above, and to the east of the 
Sues limestone, have not, so far, proved payable ; and, so far as my observation 
dior/te shales are, with the exception of one or two small dylies and sheets of 
u and porphyry, entirely free from intrusive igneous rocks, 
a gre^t Above and below the lower or third bed of shale, there is, as seen in the section, 
roeks ^’'^^^acss of altered greenish and purple chloritic rocks. 1 have examined the 
^^agiuent*^^^'^^^’ many of them are of volcanic origin ; some of them are 
as ijj ti (altered ash or breccia); others have been ejected in a molten condition, 
, of a purple and green amygdaloidal rock, which is met with in many 
fbe field. I examined a thin section of this rock under the microscope, and 
amygdaloidal diabase, very much altered ; the cavities are 
Flora ^ ^ded with carbonate of lime, but sometimes with hydrous silica. In the Lady 
Ido ®pecks of native copper have been seen in this rock, at a dejjth of about 
®Urround' speck of copper in a specimen I found on the mullock heap was 
^^Iphid ^ ^ilh oxide of iron. The copper may have been reduced from either the 
01' oxide of copper by reducing gases given off during the cooling of the rock. 
* Quart. Journ. Geol. Soc., xxviii., l>. 293. 
t Journ. E. Soo. N. S. Wales, xvi., p. 45. 
