No official flag or arms adopted yet. Jaume Ollé, 24 June 2003 Source: Flag Report10 [frp]
I have found an inretesting picture taken in National Congress of Chile showing 13 regional flags (I to XII Regions and Metropolitan Region) ... It seems that Antofagasta (Region II, second from left) has a white flag with regional emblem and its name below it. Zoltán Horváth, 14 April 2009 Source:http://commons.wikimedia.org/wiki/File:Regional_flags_of_Chile_in_the_National_Congress.jpg
Antofagasta is the governor standard. Jaume Ollé, 24 June 2003 Source: Flag Report10 [frp]
An official on line document intitled División Politico Administrativa y Sistema de Gobierno y Administración says i.a. that each region is administered by an Intendente. António Martins, 5 May 2004
image by Jens Pattke, 8 June 2013
modified by António Martins-Tuválkin, 1 June 2016
At http://commons.wikimedia.org/wiki/File:Regional_flags_of_Chile_in_the_National_Congress.jpg is a photo of a gallery of the flags of the thirteen first Chilean regions (I to XII Regions and Metropolitan Region), in the access hall of National Congress of Chile, in Valparaíso. The second (from the left) flag is the flag of the region of Antofagasta. It is white and in the center is the logo of the regional government. Jens Pattke, 8 June 2013
According communication of Veronica Castillo Rojas, public relations of the "Intendencia de la II Región", firstly from a fax (last days of 1997) and later by letter undated I received 20 January 1998, the region has a "logotipo de identidad regional" (regional logo) created in a public contest organized in Octuber 1996. This logotype is now pictured in a white flag, that must be a provisional regional flag like was (or still is) the blue flag with the seal. Jaume Ollé, 17 January 2015
This design matches the one shown in the 2008 photo taken at the National Congress building (in Wikimedia Commons); an image of the logo is at the official website (this looks very much like Jens’ source).
The logo shows stylized images of important elements of local history and economy; these elements are made of simple shapes in solid colors, mostly loose on the white background. It is enscribed in a square and has lettering above and below: "GOBIERNO REGIONAL DE" and "ANTOFAGASTA," proportionedly sized to fill one line the length of the logo, wide set in bold serifless condensed reddish-brown capitals. The logo itself shows as its main element a reddish-brown diamond (a square standing on its corner) with white double edge and a golden yellow loaded mine wagon. This diamond defines four triangular quadrants: On the upper fly, a darkest blue rendition of an observatory against a night sky with stars, an eclipse, and a comet; on the lower fly, a church against a light blue sky, a green tree, and a reddish-brown cave entrance (?); on the upper hoist, a factory with green walls, golden yellow windows, and white and reddish-brown stripped smokestack; on the lower hoist a cargo ship with reddish-brown crane, and darkest blue hull, windows, and funnel. António Martins-Tuválkin, 1 June 2016
This flag is similar to the Intendent Standard, in that both place the National Coat of Arms on a yellow disc on a blue field. But this flag has a thick red ring bearing the inscription REGION DE ANTOFAGASTA CHILE, so you know where you are. Alex Garofolo, 6 February 2016