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We compute the primordial mirror helium He' mass fraction emerging from BigBang nucleosynthesis in the mirror sector of particles in the presence ofkinetic mixing between photons and mirror photons. We explore the kineticmixing parameter (epsilon) values relevant for cosmology and which are alsocurrently probed by the dark matter direct detection experiments. Inparticular, we find that for epsilon \sim 10^{-9}, as suggested by theDAMA/Libra and other experiments, a large He' mass fraction (Y_{He'} \approx90%) is produced. Such a large value of the primordial He' mass fraction willhave important implications for the mirror dark matter interpretation of thedirect detection experiments, as well as for the study of mirror star formationand evolution.

Primordial He' abundance implied by the mirror dark matter interpretation of the DAMA/Libra signal