New Delhi, July 21 -- The output of eight core infrastructure sectors, which account for two-fifths of India's industrial output, expanded by 1.7% in June, according to provisional data released on Monday by the commerce ministry.

The production of steel, cement and refinery products recorded positive growth in June, the ministry said.

Growth in May was revised to 1.2% from a provisional 0.7%, while it was 5% in June last year.

The Index of Eight Core Industries measures the combined and individual output of key industries - coal, crude oil, natural gas, refinery products, fertilisers, steel, cement and electricity.

Core sector output contributes 40.27% to the Index of Industrial Production (IIP).

To be sure, India's industrial produ...