234 Mines and Mineral Statistics, 
way, about f3 miles in length, takes the coal from the mine to the 
"Wollongong Harbour. (fSee plan No. 3). The harbour is about 
410 feet in lengtli and 150 feet in breadth, with an average 
depth at low-water of 14 feet ; under the coal staiths it is 18 feet, 
so that vessels drawing that depth can enter at high-water and 
load under the staiths without hindrance. 
The quantity of coal sent away from this colliery in 1874 was 
38,085 tons, valued at £1(>,508 ; and when the colliery was at 
work they employed an average of 120 men and boys, and had 
twenty-eight horses, most of the latter being employed in taking 
the coal from the bottom of the incline to the harbour. Patrick 
Lahiff, Esq., is the Colliery Manager. 
Grey post. 
Coal 
ft. in. 
7 6 
Fireclay. 
Here we have a section of the seam of coal worked at the 
Osborne "Wallscnd Colliery, near AVollongoiig, in the county of 
Camden, belonging to J. Osborne, Esq., and situated about 50 
miles south of Port Jackson. (See plan No. 3.) It averages 
about 7 feet 0 inches in thickness of clean coal, without any 
bands in it ; Iho average spccilic gravity is about 1*3 ; it has an 
excellent rock roof and floor ; and the dip is about 1 in 30 to the 
west and north-west. 
It is a semi-bituminous coal, suitable for steam, household, 
smelting, blacksmith, and other pin-poses, and is by many cap)taius 
of vessels used in preference to the more bituminous coal of the 
Newcastle district, and being a stronger coal the tirebars have to 
be put further apart. This is the No. 1 or uppermost seam of 
coal ill the district (see letter If on plan and section No. 14), and it 
is found outcropping at a height of about GOO feet above the sea- 
level, in the high ranges fronting the WoUongoug Harbour, where 
