Death Valley NP: Historic Resource Study (Glossary)
The stones were dragged around until the gold ore was pulverized to a sand, freeing the gold, a period of usually one to two days. mass of rock constituting a valuable mineral deposit. Works Progress Administration, Death Valley: A Guide (Boston, 1939) Robert Peele and John A. Church, eds., Mining Engineers Handbook 3d ed., 2 vols.