As teenagers , the twins spent many summer afternoons fossicking for opals in the old mine .

十几岁时，这对双胞胎在很多个夏日的午后在旧煤矿上寻找猫眼石。

Fossicking for gold involves sifting through vast amounts of dirt for a few grammes of precious metal .

淘金的过程，就是从大量泥土中过滤出区区几克贵金属。