[1] doesn't directly answer your question, but there are some interesting stats there -- over 300k children, 5 and up, work in Bolivian mines. Bolivian Miners die on average 25 years earlier than the average Bolivian. Overall, that appears to point to a significant amount of premature death caused by mining.

On the other hand, the answer to GP's question is that this study isn't predominantly about officework. It's a global study[2], and miners are likely accounted for. Americans account for less than 5% of the statistic.

[1] https://www.theworldcounts.com/challenges/planet-earth/minin...

[2] https://ars.els-cdn.com/content/image/1-s2.0-S01604120210022...

"Paid less than $1 a day children are primarily coerced into cobalt mining work due to injury or death suffered by parents in cobalt mining, the inability to pay school fees, ..."

I don't know about in the mines, but there is this: https://en.wikipedia.org/wiki/Blood_diamond

I imagine a similar phenomenon exists for other mineral resources.