Ditto, down this side. During the 1930s, Zimbabwe had rapid growth plus the beginning of its industrialisation. South Africa's annual growth from 1933-46 was 8%, plus mfg developed massively along the 40 km strip that (along with some extremely deep goldmines) separates my petit-bourgeois suburb from townships like Soweto (you can guess which way the wind blows)... and black wages relative to white wages rose 50%, the fastest-ever period of such growth. We'd attribute this success in part to the global payments freeze and the slowdown of trade, which both forced import-substitution industrialisation and slowed capital outflows.
Sure, having gold helped. Not for nothing was South Africa nicknamed "the prosperous undertaker in the plague."