In the case of localised economic disasters
Gold and silver are excellent ways to preserve your purchasing power, when the economy crashes your silver will still be worth something to someone and so even when the Rand slides against the dollar physical precious metals still hold value.

Paper money and coins with a face value can easily lose value when inflation hits and can be devalued by the central banks — silver and gold bars cannot be.

Coins like the Mandela coin are based not on the value of the metal but the value people are prepared to pay for the face value – this is highly inflated.
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