| Raw Material Category 1 | ||||
|---|---|---|---|---|
Carbon | Vanadium | Niobium | Yttrium | |
| Raw Material Category 2 | ||||
Phosphorus | Chromium | Molybdenum | Technetium | |
| Raw Material Category 3 | ||||
Sulphur | Manganese | Cadmium | Ruthenium | |
| Raw Material Category 4 | ||||
Iron | Zinc | Tin | Selenium | |
| Raw Material Category 5 | ||||
Nickel | Germanium | Tungsten | Tellurium | |
| Raw Material Category 6 | ||||
Rhenium | Arsenic | Mercury | Polonium | |
| Raw Material Category 7 | ||||
Lead | Zirconium | Boron | Antimony | |