92 
TEW: EXTENSION OF MINING OPERATIONS. 
weighing 150 grains in slightly differing proportions to the other, 
as follows : — 
Chloride of Calcium. 
„ „ Sodium 
,. Magnesium. 
„ „ Potassium. 
Bromides a trace ; Nitrates (from decomposed vegetable mat- 
ter), Sulphates not a trace. 
Again, at a depth of 347 yards from the surface, another 
basin of salt water is found — specific gravity 1*101 : four fluid 
ounces on evaporation leaving solid ingredients weig'hing 170 grains, 
as under : 
Cloi'ide of Calcium. 
„ Sodium. 
„ „ Magnesium. 
„ „ Potassium. 
Bromides not a trace ; Nitrates (from decomposed vegetable 
matter) Sulphates not a trace. 
These Pontefract samples of water contain a large amount of 
Chloride of Magnesium but no Magnesic Sulphates. The salt 
water is found in stronger saltness at the bottom of the " Prince 
of Wales " Colliery ; again, deep down in the Wakefield rock ; 
and Mr. George Roberts, of Lofthouse, informs me, on the 5th 
October, 1882, at 352 yards from the surface, this reservoir of salt 
water has begun to ooze through the roof of a Colliery there, in- 
creasing in quantity, and becoming troublesome and expensive to 
to deal with. 
In the analysis of the brine at the Ryhope Colfiery, 556 yards 
below the bottom of the sea and 800 yards from high water 
markjin March, 1871, the constituents were : — 
Grains per Gallon. 
Chloride of Sodium 6936-39 
„ „ Potassium ... ... ... ... 39*55 
„ „ Lithium .. ... ... ... a trace 
„ Ammonium 1960-00 
Carried Forward ... ... 8935-94 
