i have done BE in Electronics. can i take admission in Mining Descipline in Section B directly
No you can't do like that. You have to pursue ME in electronics with a specialization domain. You can't pursue other domain. It is not available in India as there is learning path for every domain. It made such that students won't jump in streams which will hamper their career.
It would be a good career option if you do job and distance education for ME or full time in ME in IIT or NIT. It will increase your market value and get recognized in top companies. Basic of your experience will be your skills which will gives best work to the company to rise.
Hope it helps!