I am getting mining in NIT Surathkal. Should I take these risks or shall I join NIT Durgapur civil or chemical, NIT Calicut civil?

Your choice can be based either on the branch or on college.

NIT Surathkal is a better choice than NIT Calicut and NIT Durgapur. As far as placements are concerned, they aren’t any better for Civil or Chemical either. It is always more beneficial to go for branches like ECE, CSE, IT and EEE from a placement point of view. 

Here are the placement figures for NIT Durgapur, NIT Calicut and NIT Surathkal-

In case you have a branch preference, go for that option. With an interest in your branch, you’ll eventually pave a path for yourself. It is possible that you have no particular branch preference.Your ultimate goal might be an MBA, for which you’re simply seeking a B.Tech degree. In that case, choose Mining at NIT Surathkal.