https://edition.cnn.com/2018/09/03/africa/marine-diamond-min...
None of your comments applies to any of the mines mentioned; Canada, Australia, and the marine operations all abide by OSHA regulations and pay good wages.
If you want to make a specific comment about conflict diamonds, for example, it pays to be aware that it's not just mining that sucks in war zones .. quality of life is pretty poor all around.