Warren Buffett's Berkshire Hathaway invested in a gold miner last quarter. Here's why that's a huge departure from the past.

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· *Warren Buffett's Berkshire Hathaway bought shares in a gold miner last quarter, despite the billionaire investor dismissing gold as a subpar asset for more than 20 years.*
· *Berkshire added 20.9 million shares of Barrick Gold worth about $564 million to its portfolio, its only new position in the period.*
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