which college should I choose iit ism in fuel mineral and metallurgical engineering or iit bhu mining engineering ?

Hello,
In terms of infra, IIT BHU is still ahead of IIT Indore. The machines, etc are old in the old departments such as mechanical, etc. However, departments like CSE and Mathematics have brand new buildings, computers, etc.
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IIT(ISM) has been ranked 26th in the QS Global University Rankings in Engineering - Mineral & Mining & it is India's SECOND Highest Ranked University by Subject. Tier 1 deposits are Company making mines. They are large, long life and low cost. Using long run commodity prices it generates >$300-600m pa of revenue (i.e. >200 kt pa Cu or >800 kt pa Zn+Pb or >5kt pa of U3O8 or >250 koz pa Au) for >20 years and is in the bottom quartile of the cost curve.
The campus of BHU is legendary. The main campus is spread over 1300 acres, which is bigger than any IIT, except IIT Kharagpur. The sports facilities are amazing as there is one cricket field, two soccer fields, and one hockey field apart from swimming pool, tennis, badminton, volleyball, squash, and basketball courts.
In 1969 these three colleges were integrated together to form a stand-alone Institute of Technology, BHU. In 2012, the Government of India officially converted IT(BHU) into IIT (BHU), Varanasi and since then, IIT(BHU) is an independent academic organization contributing towards nation building.
Rankings. Among engineering colleges, IIT (BHU) Varanasi was ranked 11 by the National Institutional Ranking Framework (NIRF) in 2020 and 26 overall. It was ranked 9th among engineering colleges in India in 2019 by The Week.
IIT BHU Placement 2021 Highlights

64.26 LPA to INR. 11.50 LPA. During the previous year (2020 Placement drive), The institute had bagged a total of 762 placement offers with four international job offers with the highest salary package worth INR. 1.53 Crore per annum.

See, having a legacy of over 100 years and being one of the old Indian Institute of Technologies, both IIT (ISM) Dhanbad and IIT BHU enjoys the full glory of being an IIT. Most of the good companies that recruit in India, they recruit from here. So, rest assured about the placements as you'll get ample opportunities in both the colleges, Now the ball is in your court as you can chose the field which excites you the most.

I would personally recommend you to go to IIT BHU as Banaras is a good city as compared to Dhanbad, so you'll be able to enjoy and explore more here.

Hope I have answered your question. All the best!