Anyone know anything about this PMC copper bar?

Anyone have knowledge about this copper bar marked PMC?


The dimensions are 5 1/2" x 2 7/8" x 1 3/8" , and it weighs about 6 1/2 pounds.

I was unable to find any similar examples in my searches. An internet search of "PMC copper mining" brings up Palabora Mining Company in South Africa, but I have no way to verify whether that is or isn't the same PMC on this bar.

I'm hoping something on this forum might have some copper / mining knowledge and insights beyond my simple internet searching.

Thanks!

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