Hello there,
You haven't mentioned any particular college, so I'm enlisting some colleges which offer Diploma in mining engineering. Here you go..
1. Government Polytechnic, Nagpur
2. Adarsha College of Engineering
3. Kalinga University, Nagpur
4. Swami University, Sagar
Here are some colleges as per your need. For more information, you may visit the link:
https://engineering.careers360.com/colleges/list-of-diploma-in-mining-engineering-colleges-in-india
Hope this answer helps you.
Good luck!!