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Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers
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To: koan who wrote (40714)5/22/2007 12:58:48 PM
From: E. Charters  Read Replies (1) of 78430
 
There are very, very simple way to ensure that earthquakes does not rupture tailings dams and also that waste rock does not drain acid and poison the river.

These are:

1. mine it underground and put the tailings back underground as fill as they did at Kerr Addison. Yes, the ore is high enough grade for block caving and fill. 80,000 TPD mines ran underground in Montana historically at 0.50% copper.

2. suck the water out of the tailings, and mix the tails evenly with limestone rock, readily available in the area. Even if it the ground heaves, the rock is not going anywhere, it is chemically buffered, and will not flow.

3. pump the tails water thru active carbon which will remove 99.9999% of all metals.

4. separate the higher grade waste crudely and heap leach the waste rock with very dilute acid after crushing it finer, and remove the sulphides pre-emptively. Pass the solution thru active carbon columns. Then stack the rock with limestone and flush it for 2 years. The sulphides would be low enuff that any subsequent drainage from the waste could be ignored.

There. 100 million worth of economic environmental solutions, for free.

Webster though he was being clever. He was, and perhaps my solutions would have been rejected, but they would have worked. Forever.

EC<:-}
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