44 files including correspondence, assay results, production and analysis reports, licences, mine blueprints.

Note: The files in the collection are arranged in numerical order but are presented in this series in alphabetical order by company name.

41 files including legal correspondence (with regards to patents and licenses), general correspondence, employees' field and production reports, cables and telegrams.

Note: The files in the collection are arranged in numerical order but are presented in this series in alphabetical order by file title or correspondent's surname.

31 files including patents, patent applications, research tests, assay results, correspondence, scientific papers, blueprints.