BY EDWD. B. LINDON, A.R.S.M. 43 
fed. The silica would be found abundantly in the quartzites, and the 
alumina in the shales and greywacks of the country in the neighbourhood, 
and possibly both silica and alumina may have come in past from a deep- 
seated underlying granite. The gold, and to some extent the iron, may 
have been dissolved out of the iron pyrites of such reefs as ‘ Mundic Reef,’ 
seen in Mundic Creek; the gold possibly by chlorine produced by the 
contact of hydrochloric acid, derived from the decomposition of chlorides, 
with manganese, which occurs sparingly in the form of pyrolusite along 
with the ironstone of Mount Morgan.” 
I have drawn thus at length from Mr. R. L. Jack’s report, as I 
know that many men who take great scientific interest in Mount 
Morgan deposit, have not the privilege of obtaining this gentleman’s 
report, but will become possessed of a copy of this catalogue. 
Gotp AMaLGAM—Comp. (Au. Ag), Hg,. 
A miner named Brown informed Mr. R. L. Jack that he had 
found a few dwts. of native gold amalgam in Green Creek, just 
below the junction of Oakey Creek, Normanby, in alluvial gravel. 
CopPpER—Comp. Cu., but often containing other metals or 
impurities. 
Good specimens of native copper in quartz have been found at 
Clermont in the Peak Downs Copper Mine, but the largest 
amount occurs in the Cloncurry district, immense masses being 
obtained from the Cloncurry Copper Mines. Some specimens 
from here are very interesting, as shewing the metal in its transition 
by oxidation to cuprite, the supply of oxygen being probably 
limited at a depth, causing the formation of the red, instead of 
the black oxide. 
Large masses of native copper have been found in the Keel- 
bottom Copper Mine, near Townsville, and associated with 
chrysocolla in a N. and S. vertical joint or vein, intersecting a 
ridge of porphyry near Dalrymple, opposite Mount Keelbottom. 
A good deal of native copper has been found at Mount Perry 
and at Rockhampton, ; and at the Alliance Mine, Morinish, 
Rockhampton, Mr. Burns, one of the owners of the property, 
informs me that native copper accompanies gold in the quartz, 
causing great difficulty to the profitable extraction of the more 
precious metal. 
Copper is also associated with cassiterite in the Argyll Mine, 
Herberton. 
The massive filiform, and arborescent forms of native copper 
are of most general occurrence—indeed I do not know that any 
crystalline forms have been observed. 
