Hey Shibdas Chakraborty,

No, after completing mining engineering not only in ecl you have many opportunities to go with and they are,

GSI (Geological Survey of India)

Archaeological Department

Oil and Natural Gas Exploration Firms

Coal and Mineral Quarries

OIL (Oil India Limited)

ONGC

Refineries

Coal India Limited

Private Mineral Processing and Extracting Firms

SAIL

TATA Steel

R&D Labs and Firms

not only in these companies you can even go with self employment too!