IMAGE GALLERY: Touring Caterpillar's 6,500-acre testing grounds

[caption id="attachment_837180" align="alignnone" width="920"] Freeport McMoran’s Sierrita Mine is adjacent to Tinaja Hills. The ASARCO Mission Mine is located to the north of Sierrita Mine.[/caption] The Caterpillar Tinaja Hills Demonstration & Learning Center sits on 6,500 acres nestled in the...