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According to Reuters, the index was 3.18 points lower at 11:28 BST, dropping to 4,628.43 points.
Antofagasta, Rio Tinto, Eurasian Natural Resources, Randgold Resources and BHP Billiton were among those to see their share price decrease.
There was also a 1.4 per cent slide for Anglo American, which earlier today posted disappointing first-half results.
Shares in Royal Dutch Shell, Cairn Energy, BG Group and BP fell in the energy sector, but financial companies helped to limit the slide of the index.
Ahead of earnings announcements due next week, Royal Bank of Scotland climbed 0.4 per cent, while HSBC and Barclays jumped by 1.6 per cent and 1.3 per cent respectively.
Anglo American said this morning that operating profit from core operations slid 65.6 per cent year-on-year in the opening six months of the year.
