It is a sad history of cruelty and oppression, and a big part of the story that didn’t make the screen in Oppenheimer. It gives the marble scenes a much deeper meaning.
The reason it wasn’t in Oppenheimer is because it was about the man, not building a bomb. If someone were to make a movie about building a bomb, yeah, this would be great to add. It’s the same reason they didn’t focus on the victims in Hiroshima and Nagasaki.
I didn’t mean that it should have been in the movie. There has to be scope, especially in movies. But it is important to learn about these things. Oppenheimer just gives an opportunity to revisit these untold stories. It was the article itself that brought up the link between the marbles indicating how much refined (I believe it was actually enriched but the article just talked about refined ore) and what was going on in the Congo behind the scenes. For every great man/woman/story, there are thousands of others that prop them up for greatness, often being forced to do so.
So my intent in posting was not a criticism of the movie, but simply to share this story that I had just learned.