250 MINERALS FOR THE PARIS EXHIBITION.—GILPIN. 
The Hub seam yielded 10,539 cubic feet of gas per long ton, 
of which 55.46 per cent was used under the ovens. The average 
calorific power of the gas was 576.54 B.T. U. The average 
illuminating value of the gas with a fishtail burner was 9.8 
candle power, with a Welsb: ich burner 54. candle power. 
The average analysis of the gas was as follows :— 
Carbon dioxide ....3.1 percent.! Hydrogen ..... 50.7 per cent. 
Dihiminantsscs.. 22:7 “inl Mirshtoas! .o 30.9 
Opcry meme. Bas. teen 32 2 : Nitrogen ss... 5.6 5.0 fe 
Carbon monoxide..7.4  “ a 
Wotallive «<< . 100.0 
The Phalen seam yielded per ton 32.91 lbs. of ammonium 
sulphate, and the yield from the Hub seam was 32.24 lbs. In 
commercial estimates a deduction of from 5 to 10 per cent 
should be made for loss of ammonia during the process of con- 
centration. 
The Phalen seam yielded per ton 12.89 gals. of tar, 128.9 lbs., 
and the Hub seam yielded 13.89 gals. of tar, 1389 lbs. The 
Phalen seam yielded .103, and the Hub seam .111 gals. of 
benzole. 
In considering the illuminating power and composition of the 
gases given above it must be remembered that they are averages. 
It was pointed out in my last paper that the gas obtained from 
the first portion of the period of coking is much higher in illum- 
inating power, etc., than that given off during the latter portion 
of the period of coking. 
The General Mining Association. —This company has a 
large number of valuable coal seams, but has hitherto contined 
its operations to one, known as the Sydney Main Seam. This 
seam has been worked for over one hundred years, and still 
remains one of the most valuable assets of the Province. The 
average thickness of the seam is five feet two inches, The 
annual output 271,000 tons. The portion of the seam now being 
worked is entirely under the Atlantic Ocean, the samples 
exhibited being taken from a point 2,200 yards from the nearest 
land, and at a depth of 1,000 feet below the bottom of the ocean. 
