The value of gold has been on a month-long price rise, with investors moving money from equities into commodities.
At the same time, the value of copper and aluminum on the metal exchanges has risen to three-year highs as a result of lower-than-expected global supplies at a time of improving economic conditions.
Helping push aluminum prices upward has been a reduction in refinery capacity in China as a result of enhanced environmental inspections by federal officials.
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