When gold rallies, gold mining shares often rally harder. When gold falls, miners can fall further still. Many investors buy mining shares expecting them to track the metal, then are surprised by how much more they swing. The explanation lies in how mining companies make money, and it has a name: operating leverage.
The basic economics of a gold mine
A gold miner digs ore out of the ground, processes it and sells the gold it recovers. Most of its costs, such as wages, energy, equipment and maintenance, are broadly fixed in the short term. They do not change much whether the gold price is high or low.
The industry often summarises these costs with a figure called all-in sustaining cost, which estimates what it costs to produce an ounce of gold, including the investment needed to keep the mine running. The miner’s profit per ounce is roughly the gold price minus that cost.
How operating leverage works
Imagine a miner with costs of £1,000 an ounce and a gold price of £1,500. Profit is £500 an ounce. Now suppose gold rises by 10% to £1,650. Costs stay the same, so profit jumps to £650 an ounce, a rise of 30%. A 10% move in gold has produced a 30% move in profit.
The same effect works in reverse. If gold falls by 10% to £1,350, profit drops to £350 an ounce, a fall of 30%. Because share prices tend to follow expected profits, mining shares often move more than the metal. Our guide to operating leverage for beginners explains the concept in other industries.
The closer a miner’s costs are to the gold price, the stronger the effect. High-cost producers see the biggest percentage swings in profit and often in their share prices.
Why miners do not always follow gold
Operating leverage is not the whole story. Costs can rise too. Energy prices, wage inflation and the cost of equipment all affect how much it costs to produce each ounce. In periods when gold rises alongside broad inflation, rising costs can eat into the benefit, and miners may lag the metal.
Company-specific factors matter. A miner may face problems at a particular mine, such as flooding, strikes or lower-grade ore than expected. It may operate in countries with political risk, where governments can raise royalties or change licences. It may have taken on debt for an acquisition, adding financial risk. Management decisions about spending and dividends also influence how investors value the shares.
Mining shares are also equities, so they can be dragged down in a broad stock market sell-off even when gold is holding up. In a sharp risk-off move, investors sometimes sell whatever they can, including miners, while the metal itself benefits from safe-haven demand.
Gold in pounds versus dollars
Gold is priced internationally in dollars, and most miners report in dollars. For UK investors, currency moves add another layer. If the pound strengthens against the dollar, the value of dollar-based gold and mining shares falls in sterling terms. Our explainer on why gold in pounds differs from gold in dollars covers this in more detail.
Miners on the London market
The London market hosts several gold producers, from large companies such as Endeavour Mining and Fresnillo, which also produces silver, to smaller explorers on AIM. Diversified miners on the FTSE 100 have some gold exposure, but their profits depend more on copper, iron ore and other metals.
Investors can also gain exposure to a basket of miners through exchange-traded funds, which spread company-specific risk but keep the sector’s amplified sensitivity to gold.
What investors should watch
When assessing a gold miner, look at its cost per ounce compared with peers and with the current gold price. Check its production outlook and whether it is growing output or relying on ageing mines. Review its balance sheet: low debt gives more flexibility when gold falls. Note where its mines are located and any political or operational risks.
Keep an eye on the gold price and the drivers behind it, such as real interest rates, the dollar and central bank buying.
The bottom line
Gold miners move more than gold mainly because of operating leverage: with largely fixed costs, small changes in the gold price create bigger changes in profit. Rising costs, company-specific problems and wider market moves can break that link. Understanding both sides helps investors decide whether they want exposure to the metal or to the miners. To test your understanding of commodity-linked shares, take the free trader assessment.
