silver is the most valuable part of Mexico's mining industry.
Mexico is the leading producer of silver, followed by the United States, Canada, Australia, Spain, Peru, and Russia. Silver is one of the most valuable elements next to gold.
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.
== == The most valuable rocks would be those partly comprised of the most valuable minerals such as gold, silver, and precious gemstones.
1895
Mexico
In terms of volume and revenue, oil would be the most valuable resource. It is found along the lowlands and shallow waters of the southern Gulf of Mexico.
Oil (Ecuador, Colombia, Venezuela, Mexico) and Silver (Mexico)
What is the most valuable
Most of Mexico's silver is mined with modern equipment, including dragline excavators, mechanical screeners and roller mills.
Mexico's most valuable coin is the 50 pesos gold coin from any year in the 1920's. The gold coin from 1923, 1924, and 1926 is sold for over $2,000 on eBay.
It means that the item was made in Mexico. Mexico for about 500 years has had some of the most active silver mines in the world. In addition there is a HUGE silver jewelery manufacturing industry there. Many silver pieces in the USA came from Mexico