> As the price of gold continued to rise as they did this,
Seems counterintuitive to me. This would only make gains when they bought the new gold before selling the old, or when there's some arbitrage going on between Gold/USD, Gold/EUR and USD/EUR.
If they first sold the old for USD, then bought the new for USD, with a rising gold price, they'd miss the price-gain during the time between the trades, when they held the USD. It'd be a loss, not a gain.
If there's some arbitrage going on, then I highly doubt that brings $15B gain. The differences would have to be huge.
I think the (author (AI)) writing that article is simply mixing up stuff. I think this gain is not a cause-effect of the conversion, merely the gains from rising gold prices on the gold it holds over that period.
Well they has 129 tonnes in US which happens to be wroth around $15B or so. Probably the author has no clue what they are talking about and grossly misinterpreted..
The source is a press conference where they state the total amount and total value of gold stored hasn't changed. In le figaro they report the profit is due to variation in price between the different transactions. Which seems to be a polite way to say they took exceptional risk.