Deep Canadian Mine Yields Ancient Water (BBC News)
Water drilled from rock in a North American mine is among the oldest yet found on Earth, say scientists.
Novel dating techniques used by the Canadian and UK team suggest the fluid is at least 1.5 billion years old.
The water was probably once on the surface and then percolated through the ground where it became trapped at a depth of 2.4km. The fluid emerged at 40-50C.
The discovery, made under Timmins, Ontario, is reported in this week's edition of the journal Nature.
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