Explanation:

 1.  Mexico is the world’s leading producer of silver and has occupied top spot for several years. Mexico is responsible for 21% of global production, followed by Peru (15%), China (12%) and Australia and Russia (each 6%).

 2.  With 450.0 metric tons, China tops the list of Gold producers of the world.

 3.  The DRC is the world’s largest producer of cobalt, accounting for roughly 60 percent of global production.

 4.  USA is the world's largest producer of Molybdenum.