Anglo American’s shrinking market value could eject the global miner from London’s blue-chip equity index at the next reshuffle in March, potentially triggering a broader sell-off. Plunging commodity prices last year shrank Anglo’s market capitalisation to $5.6-billion (3.9-billion pounds) as its shares fell 76% to record lows in 2015, making it the worst performer in the benchmark FTSE 100 index.