Quarterly mine production from the world's largest listed mining companies, taken from their own reports.
Kadoa checks each company's investor pages for new reports every day.
It reads each PDF or spreadsheet and pulls out production by mine and commodity.
Names, units and fiscal quarters are mapped to one standard and checked.
Each value links back to the page of the report it came from.
A quarter appears only after a company publishes its report, often weeks after it ends.
Some companies report only totals, or only every half year, so not every mine has every quarter.
Extraction can make mistakes. Check the linked report before relying on a value.
Base metals are shown in kilotonnes (kt) and precious metals in thousand ounces (koz). Fiscal quarters are mapped to calendar quarters, so companies line up.
Consolidated figures count 100% of a mine's output. Attributable figures count only the company's share. When several owners report the same mine, rankings keep the largest figure, which is the operator's 100%.
The overview compares a quarter with the same quarter a year earlier, at mines that reported both on the same basis. It counts how many mines produced less and shows the median change. Smelters and refineries are left out.
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