It doesn't have one. However, it is a remake of the first Half-Life, which had an M-rating so it's safe to say that Black Mesa should have an M rating.
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Call of Duty Black ops is officially rated M for mature. It is not designed to be a game for children. However, many user reviews seem to place the age rating as appropriate for most 12- to 13-year-olds.
The official rating (as stated through the ESRB) is rated M (18 and over) because of the violence, gore etc.
Black Mesa is a rival science company to Aperture Science. They were originally seen on Half-Life 1 for the ps2 and pc that caused dimenstional shifts bringing an alien race to Earth who enslaved all humans due to a "resonance cascade" that occured due to an experiment involving the Anti-Mass Spectrometer. The only reference to black mesa in portal is in the end credits song where GLaDOS makes a joke that Black Mesa can help Chell. The unexplained punch line is that black mesa was destroyed at the end of half life
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