Mintails is working on it:
http://www.miningweekly.com/article/gold-producer-constructing-pipe-bridge-to-transport-gold-bearing-slimes-2009-09-18
I like the summary "Mintails will start production through the new system in November and it is expected that about 58 kg of gold will be recovered from the dump each month. The company will continue to pump slime for the recovery of gold until 2025"
58kg of gold per month, that's 58 x 2.2 = 127.6 pounds of gold = US$130,000 = AU$150,000, roughly $3m a year, don't know how much cost would that be?
pump bigger volumes of tailings materials
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