This article has platinum ore at 50oz/ton, or 1,400 PPM. Do you have a source for your claim that it is in fact one third of one percent of the stated value? https://technology.matthey.com/article/7/4/136-143/
Edit: I see now that it is in fact 1,400 PPM of some intermediary matte, not raw ore. Th matte/ore ratio is not stated. But that matte is nickel/copper rich, and the platinum is in some sense a impurity in the existing ore that would likely be mined for its other metals anyways.
Even still: not all ore is equal. Platinum mining is a heavily industrialized process where machines do the hard labor, cobalt is child labor camps digging.
Edit: I see now that it is in fact 1,400 PPM of some intermediary matte, not raw ore. Th matte/ore ratio is not stated. But that matte is nickel/copper rich, and the platinum is in some sense a impurity in the existing ore that would likely be mined for its other metals anyways.
Even still: not all ore is equal. Platinum mining is a heavily industrialized process where machines do the hard labor, cobalt is child labor camps digging.