Growth in the country's eight infrastructure industries plunged to 0.1 per cent in June, mainly due to contraction in crude oil, natural gas, coal and electricity output. The eight core industries had expanded 7.9 per cent in the June last year. The contraction in production of coal, crude oil, natural gas and electricity in the month was 3 per cent, 0.6 per cent, 16.7 per cent, and 1.2 per cent, respectively, according to government data. But petroleum refinery production expanded 2.3 per cent, steel production grew 3.4 per cent, and cement output rose 2.3 per cent in June.During the April to June 2013 period, growth in the eight infrastructure industries slowed to 1.6 per cent, from 6.9 per cent in the same period last year.