Or are even deeper discounts still around the corner???

Teck approaching $4. As most people know here, it hit $60 in early 2011.

First Quantum Minerals was worth more than $20 for most of 2011 through 2014. Currently at $3.79.

Rio Tinto is about a 50% bargain compared to its aveage over the past four years, trading at $24.50.

BHP, another one of the world's larger diversified miners, is close to $21. During the depths of the 2008 recession, it only fell to $29. From most of 2010 through 2014, BHP traded at $60+ (and briefly crested $100 in April 2011).

Glencore, which has maintained an average of close to $300 over the past four years, is currently around $73.50.