Metallurgical coal

• no dataMetallurgical coal: no secondary supply exists (consumed as reductant) - No secondary/recycled metallurgical-coal supply exists anywhere in the authoritative ecosystem: met coal's carbon is chemically CONSUMED as the reductant - coke reduces iron ore to hot metal and exits the system as CO2/process gas, so unlike metals there is nothing to recover post-use. No agency (IEA, EIA, USGS, worldsteel, DISR) publishes a 'secondary met coal' statistic. The closest concepts are all IN-PLANT process flows of primary material, not secondary market supply: coke breeze is consumed on-site as sinter-plant fuel, blast-furnace dust carbon can substitute it (carbon replacement factor near 1.0, Lanzerstorfer 2015), and cleaned coke-oven/BF/BOF gases fuel the works (worldsteel: can provide more than 60% of a site's power). Steel-industry circularity (scrap, slag, gases) is a STEEL story, not coal recycling.
• datedExport-restriction inventory ends 2020 - The OECD industrial-raw-materials inventory (vendored snapshot) reports HS-line measures only through 2020; restrictions enacted since are not reflected in the measure table.

The eight-stage lens, the observed-vs-estimated membrane, stage-honest supply, per-stage concentration, ownership resolution and the demand lens - the full method is illustrated live on copper, nickel and lithium.

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