Mark Bristow, a 58-year-old who rode a motorbike from Mombasa to the mouth of the Congo river in 2016, is as close to Indiana Jones as a FTSE 100 CE gets.

Yet Randgold Resources, which he set up two decades ago, is the least derring-do of all UK-quoted gold miners. Strike the "gold" from its name, and the business looks like a conservatively run diversified commodity business.

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