 Soon after the marriage, Maximiano Errazuriz entered into a partnership with his father-in-law to form a copper-producing company.Copper is one of Chile's most important natural resources, and at one time, their company accounted for one third of the world's total copper production.A year later, in 1856, Maximiano Errazuriz formed the "Santiago Gas Company" (), a company which was responsible for establishing street lighting in the capital city of Santiago.