HOW ON ANALYSIS OF TWO SPRING HILL COALS. 101 



II. The 6 foot Seam. 



This seam is the property of the General Mining Association. 



Only a few tons of this coal have been used by the people living 

 in its immediate vicinity, and it is justly considered by them as a good 

 house coal. The specimens were taken by myself from a heap at 

 the mouth of the pit sunk near the outcrop. 



The analysis gave the following results : — 



Ordinary coking (air-dry specimen). 



Hygroscopic moisture 3.47) , , ar\ a^ 



Volatile combustible matters 26.98 } 



Fixed carbon 64.48 ) ^ , nr . ct 



Ash 5.07) Coke ' 69 ' 55 



100.00 



Theoretical evaporative power . . 8.859 lbs. 



Total sulphur per cent 231 



Specific gravity 1.30 



Calculated weight of 1 cub. ft. unbroken 81.10 lbs. 



" " " " broken 54.50 " 



Space for 1 ton (2240 lbs.) on stowage (economic weight) 41.10 c. ft. 



This is a compact, bright, clean coal, breaking with a conchoidal 

 fracture. It has a peculiarly striated, slicken-sided surface. It 

 cokes freely, swelling about £ its original bulk, giving a firm, com- 

 pact coke. The ash is white, which in itself is proof of but small 

 amount of sulphur existing in the coal as pyrites. The ash proved 

 to contain by qualitative analysis a considerable amount of insoluble 

 residue ; a little soluble silica ; notable amount of peroxide of iron 

 and alumina ; sulphuric acid and lime decided in quantity ; small 

 amount of magnesia ; trace of phosphoric acid. 



