Here are a list of the total number of medals from Spanish-speaking countries/territories at the 2012 Olympic Games in London (in alphabetical order):

Argentina - 4 medals:  1 gold medal, 1 silver medal, and 2 bronze medals.
Colombia - 8 medals:  1 gold medal, 3 silver medals, and 4 bronze medals.
Cuba - 14 medals:  5 gold medals, 3 silver medals, and 6 bronze medals.
Dominican Republic - 2 medals:  1 gold medal, and 1 silver medal.
Guatemala - 1 medal:  1 silver medal.
Mexico - 7 medals:  1 gold medal, 3 silver medals, and 3 bronze medals.
Puerto Rico - 2 medals:  1 silver medal, and 1 bronze medal.
Spain - 17 medals:  3 gold medals, 10 silver medals, and 4 bronze medals.
Venezuela - 1 medal:  1 gold medal.