Don't know if it's common practise or not but MD Peter Harold of SMY has stated that their "smelter charge is a percentage of the nickel price", as opposed to a fixed cost, which means their cash costs increase/decrease along with the nickel price. Refer to the link below.
http://www.asx.com.au/asxpdf/20061026/pdf/3z6l9rmyk8lxh.pdf
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