London stocks kept a foothold in the green Monday, helped by a positive start for August across global equities and gains for the heavily weighted mining sector, following a bullish ratings upgrade by JPMorgan. The bank’s global equity strategy team lifted miners to overweight from neutral, commenting that after a stretch of weakness — 16% off first-quarter highs — “the valuation gap emerging relative to spot prices/earnings provides an opportunity for outperformance.” From the bank’s European mining, metals and steel team, lead analyst Luke Nelson, said earnings to date have confirmed “diversified miners’ capital returns credentials.”