Two categories of archives are held and/or managed by the IHA:
These archives represent, in 2024, a set of about 280 linear meters of which about half has been the subject of extensive conservation and cataloguing efforts.
This collection is essentially made up of archives from the head offices, factories or subsidiaries of aluminium companies, preserved by former employees from these companies or by volunteers from the IHA, following reorganizations or closures of different industrial and administrative sites.
This collection includes Henry Gall's personal archives, and archives associated to the various industrial companies involved in the history of SECEMAEU, from its origins to propserity.