Mining firms have contributed to a bright start for the FTSE 100, which is up 25 points, or 0.39%, to 6575.9, but a mining firm is also one of the morning's biggest losers.
Mineral resource mining firm Rio Tinto is leading the way, up 225 points, or 6.81%, to £35.30. Following up behind it is electronic retailer DSG International, up 6.2 points, or 3.7%, to 173.9p, and copper mining firm Kazakhmys, up 33 points, or 2.8%, to £12.11.
However, these early gains are under threat from losses for business software supplier Sage Group, which is down 11 points, or 4.1%, to 257.25p, and copper mining firm Antomagasta, down 14.25 points, or 2.51%, to 554.25p.
Insurance firm Old Mutual is also down in early trading, shipping four points, or 2.21%, to 177p.
In the US, the Dow Jones had a balanced day, finishing down 3.9 points, or 0.03%, to 13309.07.
Computer software firm Hewlett Packard had a positive day, finishing up 1.21 points, or 2.76%, to 45.01.
This was closely followed by aluminum producer Alcoa, which finished up 0.87 points, or 2.25%, to 39.5, and world-renowned entertainment dynasty Disney, which finished up 0.49 points, or 1.36%, to 36.55.
However these gains were overshadowed slightly by Wal-Mart Stores, down 0.51 points, or 1.05%, to 48.1, United Technologies, down 0.71 points, or 1.03%, to 68.34, and Coca Cola, down 0.54 points, or 1.01%, to 53.07.
In Japan, the Nikkei 225 Stock Average added 91.28, or 0.5%, to 17,748.12 at the close in Tokyo, its best finish since Feb 27, led by shipping companies.
Nippon Yusen, Japan's biggest shipping line, advanced 50 yen, or 4.7%, to 1,116.
Nippon Steel Corp., the world's second biggest maker of the alloy, gained 23 yen, or 2.7%, to 880, while Sumitomo Metal Industries, Japan's third largest, jumped 38 yen, or 6%, to 672.
Among companies that fell, Softbank, Japan's third largest mobile phone operator, tumbled 85 yen, or 3.2%, while refining firm Idemitsu Kosan tumbled by the exchange-imposed maximum daily amount of 2,000 yen, or 13%, to 13,860.
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