remember when gold went to ca 1850-gold miners wen

remember when gold went to ca 1850-gold miners went crazy w marginal costs up to 1600 plus - same happened when iron went to 192- and now both some iron and gold producers are withdrawing expansion plans-at the present time these iron prices are not sustainable (though they may be in a couple years) for if they continue many producers would decline because these prices are below the marginal cost of many producers,esp domestic chinese, who went wild when iron went to 192