AISC, or all-in sustaining cost, is the cost per ounce of producing gold and sustaining that production. It extends cash cost to include sustaining capital expenditure, exploration at existing operations, royalties and production taxes, and corporate overhead, while generally excluding growth capital for new projects and financing costs.
Because AISC is an industry guidance measure rather than a strict accounting standard, definitions differ between producers and figures must be compared carefully. When the gold price approaches sector AISC, higher-cost operations become uneconomic and supply discipline follows, which underpins the cost-floor argument — but closure decisions play out over quarters, making AISC multi-quarter context rather than a level that supports XAUUSD intraday.