Ruth Hesperia Mellings Olivares, aunt of Hilda Haydée, was born 21 sep 1920, and her birth was registered in the circunscription of Catalina (near Antofagasta) in 1964. The late registration may signify some trouble finding info... (accuracy, in example)
Also, there is a 1896 marriage in Antofagasta (24 jul 1896) of Pedro Merling Viltarre, 27 years old, son of Santiago Merling and Dominga Viltarre, who identifies as a Chilean (then, in the birth registry of a son, as an Englishman), a train driver, and Emilia Alfaro Bernal, 29 years old, dedicated to domestic labours, daughter of José Mercedes Alfaro and Carmen Bernal. He signs as Merling (may be a mispelling?)
I found Luisa Evarista Mellings Olivares's birth in Catalina, 1908 (RC Catalina, Nacimientos, 436, 1908).
Just a historical note: the Catalina circunscription, once named Refresco, was later renamed Salitrera Alemania, until it was supressed and annexed to the Taltal circunscription in 1977.