Investors bruised by platinum's dismal failure to capitalize on a five-month strike in 2014 are not convinced that stocks of the metal have shrunk enough to justify a return to the market, despite positive supply-side news this year.

Uncertainty over how abundant these stocks are is continuing to curb investment interest in the metal, with holdings of platinum-backed exchange-traded funds (ETFs) falling to their lowest since mid 2013 this month.