to comply with mining law you must also have the necessary mining electrical certification..
I am not sure that this is strictly correct.
With regard to "Mining Law" my understanding is that it is the responsibility of the Mine Manager to appoint a competent person (s) to carry out electrical work. Reg 16 of the electrical regs states that in assessing competence "account should be taken of: (a) experience, technical knowledge and ability to understand the system and electrical equipment on which work is being carried out...."
In the context of coal, shale and fireclay assessing competence will include approved qualifications (including mine electrical qualifications).
However MASHAM Appendix 1 para 5 specifically states "No qualifications have yet been approved for mines other than mines of coal, shale and fireclay".
My reading of this is that approved qualifications are not required in law in mines other than coal, shale and fireclay.