We are now more than three years into a global commodity-price boom and mineral exploration activity is being conducted at a rate not seen in over a decade. From 2004 to 2006, the Metal Economics Group estimates that mineral exploration spending increased 86% to US
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机译：我们现在已经进入全球大宗商品价格热潮的三年多了，而矿产勘探活动的进行速度却超过了十年。 Metal Economics Group估计，从2004年到2006年，美国的矿产勘探支出增长了86％
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