16. The geology behind Ontario's world class metal districts
from Northern Miner
From Sept. 22, 2016:
Ontario has a long and lively geological past dating back 3.3 billion years, when the Earth was covered by oceans. During that time, intense volcanism formed the Earth's crust, giving way to a barren and lifeless landscape blasted by radiation from the sun. Three billion years ago, plate tectonics moved thin rafts of rocks at a rate much faster than they do today. Over time, the volcanic islands butted together into one large block of land, with most of the action starting around the Red Lake area, a prolific gold-mining camp in northwest Ontario.
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