I drew the outline of the path within the maze (Uspallata, Mendoza, close to Ruta Nacional 149 highway in Argentina), and it follows the classic "Cretan" design (actually it is a universal design, repeated across the globe spanning thousands of years):
The "inca" labyrinth of Uspallata
The image above is the maze at Uspallata. In red I outlined the route from the center to the entrance. The yellow line is a "corridor" that leads nowhere. It makes the maze symetrical.
I believe that it is not a maze built with high walls, perhaps it is just a path outlined with boulders, less than 4 inches (10 cm) high. That would explain why the wind or a flood uncovered it recently. Not much soil had to be removed.
Notice how similar it is to the ones below:
Images of similar mazes (from top to bottom): Coimbra, Portugal. Cornwall, England. Finland. Hollywood Stone, UK. Padugula, India. Sardinia, Italy. Syria.
Sources of the images and further reading
The Mystery of the Labyrinth. M. Elviro.
L. Wormhoudth. Labyrinth / Maze
Labyrinthos J. Saward
Patagonian Monsters - Cryptozoology, Myths & legends in Patagonia Copyright 2009-2013 by Austin Whittall ©