Large migration of people to newly-discovered precious metal deposits (4,4)

I believe the answer is:

gold rush

(Other definitions for gold rush that I've seen before include "Movement of people to rich mining area" , "Klondike-style scramble?" , "of Olympic sprint?" , "Stampede of prospectors" , "The 1840s mining frenzy in California" .)

I've seen this clue in The Irish Times.

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