This article shows a document related to the advice given by the Compañía Minera de Cobre to its US workers at the Potrerillos mine, entitled: "Information for Employees. Andes Copper Mining Company, Potrerillos, Chile", dated 1918, which is part of the Company's archives held at The Montana Historical Society Archives. The text is accompanied by a brief historical contextualisation that addresses the social situation of the copper mining companies in Chile, their housing camps and possible interpretations of the document. It is concluded that the document provides accurate information on the living conditions of its inhabitants, and that it reflects the foreigners' view of Chile.