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At 10:00 BST, the index was 60 points higher at 5,251 points, Citywire reports, with commodity firms being especially popular with buyers.
Vedanta Resources, Kazakhmys and Fresnillo saw rises of up to 58p, while in the energy sector Tullow Oil climbed 28p to 1,264p after it emerged that it had made an oil discovery in Africa.
Elsewhere, luxury goods manufacturer Burberry rose 13p and Bunzl added 15.5p. However, there were falls for Lloyds Banking Group, Experia, Aviva and Severn Trent.
Market strategist Joshua Raymond explained the fact that many investors have began buying after the FTSE 100's decline on Friday is a "big positive".
He observed that the market is still "right in the middle of the earnings season", with both Bank of America and General Electric reporting disappointing results in the US last week.
