In the autumn of 2022, gold was trading at little more than $1,600 an ounce. It has more than doubled in price since then, topping $3,300 last week. Investors spent more than £15 billion on gold funds in the first three months of this year, and central banks, from Poland to Qatar, are stocking up on bullion. With President Donald Trump stoking global uncertainty, gold is the most obvious asset to buy. And the market is hot. Today, many gold mining stocks are soaring but firms in related industries have yet to catch up – and they could deliver real long-term rewards.