大多数硬币是由铜和镍的合金制成的。
一些吹毛求疵的批评者认为淡水河谷对铜和镍的风险投资并没有完全成功。
Critics carp that Vale's ventures in copper and nickel have not been wholly successful.
可用此工艺铸造的典型材料有：铁、钢、不锈钢以及铝、铜和镍的合金。
Typical materials that can be cast with this process are iron, steel, stainless steels, and alloys of aluminum, copper and nickel.
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