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Extract from :-
Quantity of Water Raised. This is sometimes very great. I am unable to give the exact quantities from the most extensive collieries, but one has already been mentioned from which 22,500 gallons per hour are raised. It is probable that this quantity is in some places greatly exceeded, as there is no reason to suppose that the water from extensive coal mines is less than from some Cornish mines.
At Mellanear copper mine, near Hayle; a comparatively small mine; during the month of April 1873, and for many months previously, no less than 1162 gallons of water per minute were raised, chieﬂy from the bottom of the mine. In some mines the quantity raised has reached, for short periods, the enormous quantity of 3000 gallons per minute.