After the tsunami in Iquique and the 1868 Arica earthquake, it was necessary to give legal recognition to the "Chimba" as a mining town. On 27 August 1868, Bolivia's President Mariano Melgarejo instructed the Prefect of the Department of Litoral, the official founding of "La Chimba", in the area bounded by the commissioners and Jose Santos Hilario Ruiz Prada. On 22 October 1868, the population was officially established and the port under the name "La Chimba", as stated in the foundation charter. Later the city was renamed "Antofagasta". The first official map of the population and the port of Antofagasta was designed by Jose Santos Prada on 14 September 1869. This document set out the grounds of the Melbourne Clark Company, plus 17 blocks and the Main Square.