There's no reason to attack masculinity. I know it's trendy to do so right now, but the gender norms aren't going away yet in some parts of the country still. If politics are involved, it's likely all about money and power.
Also, if your goal is diversity, that requires me to consider one's cultural background before discriminating against them. Why wouldn't you do the same for masculine guys?
Specifically in the context of coal mining, while I appreciate that communities get built around it that doesn't mean it should be extended beyond wider economic and environmental sense. Coal mining is both dangerous and literally toxic for those involved, but somehow people not involved in it invoke its macho status.
Similar, in dating statistics it is very clear that women will preferential choose well earning men over low earning men. This pushes men in general to take high risk high reward professions.
Unless you redefine masculinity to include how people perceive and treat men you can't define it to be the causes for higher suicide rates and higher risk seeking.