226 Notice of Memoirs—The Mineral Wealth of Queensland. 
As I have recorded the presence of this deposit in many places in 
the neighbourhood of Derby, it is very satisfactory to find it resting 
in considerable masses upon, and separated by a sharp line of 
demarcation from, the Chalky Boulder Clay. It is evident from the 
great quantity of flint which exists in the Newer Pleistocene 
Boulder Clay and River Gravels of the Derwent Valley, at and 
below Derby, that the small patch of Chalky Boulder Clay on the 
side of Mill Hill is merely a remnant of a great mass of the same 
deposit which once partly choked up the Derwent, Trent, and other 
valleys, outliers of which are to be seen at Chellaston, Doveridge, 
and Hanbury Wood End. 
39, CaversHaAM Roap, Kentisu Town, N.W. 
IN(OEMCCIaS) | (ena IMrssWiOorsiss 
T.—Tae Mineran Wraith oF QuennstanD. By R. L. Jack, 
F.G.S., F.R.G.S., Government Geologist. Brisbane, 1888. 8vo. 
pp. 71. With Map showing position of the Mineral Fields. 
NHIS book, written at the request of the Hon. the Minister for 
| Mines and Works, gives a resumé of the mining statistics of 
the Colony, with an account of the mineral fields that have been or 
are being worked, of the geological formations in which they occur, 
the methods of working and of reducing them where the latter is 
done on the spot, as well as a list of the minerals associated with 
them, and a table of localities where minerals yet undeveloped are 
known to exist. 
In 1887 about 400,000 oz. of gold were raised, of which less than 
25,000 were of alluvial origin, the remainder being obtained by 
crushing stone containing from one to two ounces to the ton. 
The wealthiest gold field is the Charters Towers, for which the 
returns given for 1887 are alluvial 317 oz., reef 151,060 oz. obtained 
by crushing 83,292 tons of quartz. The gold here is associated with 
pyrites, galena, and zinc-blende, and the yield per ton shows a 
slight increase at the deepest levels, the lowest of which is now 
1400 ft. 
Gold occurs in most parts of the Colony, but as far as at present 
known only in paying quantities near the coast in the southern half, 
while in the northern or tropical divison in the interior as well. 
The most remarkable mine is that of Mount Morgan in the Rock- 
hampton District. The Mount is a dome-shaped hill 1500 ft. above 
sea-level and 500 above the surrounding table-land, of which the 
Newer Pleistocene Boulder Clays of Lincolnshire is evident from the following 
passage in his letter, which I quote. Referrimg to my short paper in the Gzox. 
MacAazine for October, 1888, he says, ‘‘ He suggests, however, that some of the 
clays classed by me as Newer Glacial may really be older than the Chalky Boulder 
Clay, and he apparently finds great difficulty in accepting the occurrence of such 
Newer Glacial beds at elevations approaching 400 feet.’’ My greatest difficulty, 
distinctly stated, was the supposed ‘‘ marine aspect of the high level, brown, 
Boulder Clays.” All Boulder Clays are certainly not marine, frequently not even 
aqueous. 
