RE: AB - see quote below. And this was when prices were around $3/lb, not the $1.5/lb you seem to quote from nowhere. Nord's filed for bankruptcy in the later years, not when copper prices were that low.
The average cost per pound of copper sold during 2012 was $5.04 per pound. The amount of abnormal production costs, which is down 30.8% from the 2011 level, is primarily related to the suspension of mining and crushing of new ore effective July 2010 and the resulting decline in production from residual leaching activities. The average cost per pound of copper sold excluding abnormal production costs was $1.44 per pound, unchanged from the 2011 level.
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