What is Mexico's most important natural resource?

Answer 1

It could be oil, but it is rapidly depleting (8 more years and it is gone). Other would be silver, for which Mexico is the largest producer in the world.

Answer 2

Oil is the most profitable commodity extracted from the Mexican soil (it is worth US$41.6 billion in exports for 2013). It is followed by gold (US$5.69 billion) and copper (US$2.66 billion).