Miner margin is the gold price minus all-in sustaining cost, so it behaves as a spread with fixed costs underneath. At a ,400 AISC benchmark, gold rising from ,600 to $2,000 is a 25% move in the metal but a 200% move in margin per ounce — the leverage that drives gold equity volatility in both directions.
Gold miner margin is the gold price minus all-in sustaining cost, which makes it a spread with a largely fixed cost underneath. At a ,400 AISC benchmark, gold rising from ,600 to $2,000 is a 25% move in the metal but a 200% move in gross margin per ounce, and that arithmetic is why gold equities amplify metal moves in both directions.
Three further effects magnify the leverage inside a real producer: lower cut-off grades in strong markets raise both output and unit cost, a fixed cost base means incremental ounces are highly profitable, and a sustained higher price converts resources into reserves and extends mine life. All three reverse when the price falls, and reserve write-downs rather than quarterly losses are usually what destroys the equity.
The published dataset applies the margin calculation to month-end XAUUSD closes at ,200, ,400 and ,600 AISC benchmarks and is free to download and reuse with visible attribution. It is regime context rather than an entry signal: monthly data and a multi-year cost cycle cannot time an intraday gold trade.