Date: 2010-07-07 08:41 pm (UTC)
From: [identity profile] icedrake.livejournal.com
Wikipedia says lunar regolith contains 0.01 ppm of He3. For comparison's sake (because I'd just finished researching the subject), gold deposits on Earth are being worked right now, at yields of 5 grams/tonne of ore. Still a full two orders of magnitude higher than the concentrations on the moon, but I wouldn't dismiss the possibility of economical extraction out of hand.

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