In the district Nihuil the Salinas del Diamante is a National Protected Area in the province of Mendoza. This is a huge salt mine open pit, located 60 km from the city of San Rafael and between it and Malargüe, so you can access it through the route 144.
In early 2015 the income for the general public, after 129 years of operation is enabled. To make viable the tourist exploitation of the place, it installed a Salt Museum, which functions as an information point for all people who want to visit the Salinas. The place has historical data, and salts from different salt of the world.
Furthermore, in the place you can buy tourism products related to salt as flavored salts with local herbs, lemon, thyme, chimichurri or traditional spices. You can also purchase bath salts for thermal baths. Since the opening of the Salinas had a very good reception among visitors, it is planned to exploit the astro-tourism at the site, as it has optimum conditions to make visualizations thanks to salt, and the possibility exists (in the future) of trips balloon.
Both museum admission and in the vicinity of the salt there maquinaras formerly used to extract the ore. The place is open during the summer, long weekends, Easter and winter holidays.