Company description

Facility Ownership Sebree 100% Owned Mt. Holly 100% Owned Grundartangi Facility 100% owned; long-term ground lease Vlissingen Facility 100% owned; long-term ground lease Jamalco 55% Joint venture interest; long-term ground lease Chicago Corporate Office Long-term office lease Bauxite Mining Properties Century has access to large bauxite deposit areas with mining rights that extend through 2031. The Company obtains bauxite from these resources in Jamaica. Tonnes of bauxite are reported on a zero-moisture basis in millions of dry metric tonnes (mdmt) unless otherwise stated. As used in this Form 10-K, the terms “mineral resource,” “measured mineral resource,” “indicated mineral resource,” “inferred mineral resource” and “mineral reserve” are defined and used in accordance with subpart 1300 of Regulation S-K. Under subpart 1300 of Regulation S-K, mineral resources may not be classified as “mineral reserves” unless the determination has been made by a qualified person (as defined under subpart 1300 of Regulation S-K) that the mineral resources can be the basis of an economically viable project. The approach to mining at Jamalco is such that, in the qualified person's opinion, the documented mineral reserves are too small to merit reporting and as such, mineral reserves are not included in the discussion below. Refer to “Property History and Condition” below for more information on why reportable reserves are not available. Part or all of the mineral deposits (including any mineral resources) in these categories may never be converted into mineral reserves.

Read the full filing description · filed 3 Mar 2026

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