As a former student of Mineral Engineering at IIT Dhanbad, I will offer some insight into my department-

Advantages

1. The number of lectures and syllabus of Mineral Engineering are quite manageable. With some effort, you’ll easily score a good CGPA in all your semesters.
2. The course will give you free time to study for CAT/GRE/UPSC, or to practice coding.
3. The department allows more freedom to enjoy campus life and perform other activities on the side.

Disadvantages

1. You can’t write the GATE exam.
2. Very few core companies visit the campus, and the placement scenario is in a poor state for Mineral students. However, with good communication skills and an 8+ CGPA, you can hope to get placed in a good organization.
3. The curriculum is light, so you’ll severely lag behind foreign university students.
4. The package offered to Mineral students stands nowhere compared to that grabbed by CSE students.

But despite the disadvantages, you’ll have to make peace with the fact that your rank isn’t enough for CSE. Also, not everyone in CSE performs exceptionally. 

Mineral Engineering (especially at IIT Dhanbad) has very limited scope, but it offers you ample freedom and time to work on your skills and build your future.