The FTSE 100 rose 0.9% to 5,791.10 in early morning trading as a weaker US dollar provided support for mining stocks.
An announcement by G20 countries they will work together to avoid 'competitive devaluation' of currencies over the weekend was interpreted as negative for the US dollar.
This morning, the US dollar fell to a fresh 15-year low against the yen, down nearly 1% to ¥80.65.
Xstrata led risers, up 3.64% to £13.36, followed by a 3.3% gain for Kazakhmys to £13.77, while Rio Tinto advanced 2.75% to £42.17.
Meanwhile, Lloyds led fallers, dropping 1.42% to 70.83p, followed by Invensys, down 0.84% to 317.7p.
On Wall Street, the Dow Jones slipped 0.13% or 14.01 points to 11,132.56 on Friday.
Currency issues occupied investors attention as G20 leaders discussed how to control trade imbalances.
However, the Nasdaq advanced 0.8% or 19.72 points to 2, 479.39 following positive figures from internet firm Baidu and SanDisk.
In Japan, the Nikkei erased earlier gains to close down 0.27%, or 25.55 points, to 9,401.16.
Investors were cautious ahead of the start Q3 reporting season, which begins this week. Companies reporting include Canon and Sony.
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