The base of this new currency is not bullion or precious metal, but commodities, such as foodstuffs and cloth.

新币的储备不是金银等贵金属，而是粮食、布匹之类的商品。

youdao

But it is pointed out that the retrieves system of precious metal in China is not perfect and needs the policy supporting urgently.

指出我国废旧贵金属回收体系尚不健全，亟待政策支持。

youdao

But the precious metal is not just underground, it's also in the "tailings" - heaps of grey-white residue left behind by old mining activity.

BBC: Golden opportunity for old Indian mines