[gaius]

Loggers, refuse collectors, meatpackers, miners etc etc are also disproportionately male.

[DanBC]

You were told three years ago about the programmes that exist to correct the gender balance in each of those industries.

https://news.ycombinator.com/item?id=6508777#6509275

Women in mining: http://internationalwim.org/

http://www.womeninmining.org/

Women in construction:

http://www.nawic.org/nawic/default.asp

(some editing to tone it down a bit.)