Cox.—On the Mineralogy of New Zealand, 871 
At Mokau the coal seams vary from 2 feet to 6 feet in thickness, and a 
trial of the coal against Waikato showed it to be one-fourth better, 14 tons 
of the Mokau coal doing as much as 2 tons of the best Waikato (Hector, 
Geol. Rep. 1879-80, p. 21). The composition of these coals is— 
Fixed carbon .. x PA 2. 50:10 
Hydro-carbon on e «> 8400 
Water .. m à 3s vs BIS 
sh e 2-70 
100:00 
At Whangarei two mines are at present at work—viz., Kamo mine, in 
which there are two seams 4 feet to 4} feet and 8 feet to 12 feet thick respec- 
tively; and the Whau Whau mine, in which the seam is from 5 feet to 9 feet 
thick; besides which outcrops of coal occur at Whareora 8 feet to 8 feet 6 
inches thick; and at Hikurangi, ten miles from Whangarei, there are 
numerous outcrops of coal from 2 feet to 6 feet thick. 
The average composition of these coals from a number of analyses 
18 :— Fixed Hydro- 
carbon. carbon Water. Ash, 
Kamo .. .. 48°83 38:60 8:98 8:59 
Whau Whau .. 47°50 41:45 7:59 3:46 
Whareora .. 4594 38°79 a 8:21 
Hikurangi .. 43°41 45:67 4-76 
making the ee au of the coals from the Whangacal field— 
cud cada sa mp — SEIS 
Water .. te M EM s T:45 
AB s zu oa 5:00 
100:00 
AxnHYpROUS Coats, 
Glance Coals.—These, which are brown coals, altered variously in the 
vicinity of certain dykes and flóes of dolerite, are only met with as workable 
seams in the Malvern Hills coalfield, where they occur as seams from 2 fect 
to 10 feet thick. They occur in all stages of change from brown coals to 
anthracites, and some of them might, with propriety, be classed under the 
subdivision of pitch coals, but since they all belong to a series, I have 
thought it better to group all that have undergone any degree of change 
under the present head, those in which the percentage of water is high 
being left with the brown coals. Some of these with a high percentage of 
water however, exhibit signs of change, the percentage of fixed carbon to 
hydro-carbon being large, as in the case of the seams at the Rakaia Gorge, 
already quoted. The following table of analyses shows how varied they are 
