Not every gold miner is winning: rising costs explained

With gold above $4,000 an ounce it is tempting to assume every gold miner is having a good year. Caledonia Mining is a reminder that a high price is only half of a miner’s margin. The company has cut its 2026 production guidance and raised its cost outlook, according to Mining Weekly.

The guidance cut

Production at Caledonia’s Blanket mine in Zimbabwe fell to 17,030 ounces in the third quarter, down from 19,106 ounces a year earlier, Mining Weekly reports. The company now expects to produce 69,000–72,500 ounces for the full year, and has raised its guidance for all-in sustaining costs to $2,650–2,850 an ounce.

As reported by Mining Weekly, 9 October 2026.

What AISC means

All-in sustaining cost, or AISC, is the most widely used measure of what it really costs to produce an ounce of gold. It starts with the cash cost of mining and processing, then adds what a company must keep spending to sustain production — replacing equipment, developing new underground areas, corporate overheads, and exploration needed to replace what has been mined. It was introduced by the World Gold Council in 2013 so that investors could compare miners on a like-for-like basis.

AISC is calculated per ounce, which is why lower production pushes it up even if total spending does not change. A mine with largely fixed costs that produces fewer ounces spreads the same bill over less gold.

The margin, in rough terms

Against Friday’s spot price of around $4,194, an AISC of $2,650–2,850 leaves a margin of roughly $1,350–1,550 an ounce — still healthy, and our arithmetic rather than a company figure. But compare it with Lundin Gold’s record quarter, where a very high-grade mine sold gold at an average $4,299, and the difference between producers becomes clear. Rising costs mean that if the gold price falls, higher-cost producers feel it first and hardest.

Operational risk

Single-mine companies carry concentrated risk: any problem at the one operation is a problem for the whole business, and a weaker quarter shows up directly in guidance. Operating in Zimbabwe adds its own layer, including currency controls, power reliability and changes to mining rules — factors that can lift costs regardless of the gold price. Mining Weekly’s report covers the company’s own explanation of the quarter.

How to compare miners

• AISC per ounce — the margin buffer against a falling gold price.
• Grade — higher-grade ore generally means lower cost per ounce.
• Number of mines and jurisdictions — diversification against a single operational or political shock.
• Guidance track record — whether a company tends to meet, beat or cut its own targets.

None of this is a recommendation about any company; it is how the industry itself reads results. The live gold price is the other half of every margin calculation.

Every figure here is as reported by the publications listed under Sources, at the time they reported it. Prices move; the live gold price has the current one. Nothing on this page is investment advice.