Shovels, trains and workers in Valley of the Moon copper mines, Chile 1950

VS shovel digs up dirt and deposits it in train cars / VS hand points to rocks in ground and copper in rocks / VS crane moves segment of track into place, workers detach it from crane / VS shovel dumps rocks into train car / MS train moves on mine ledge, train on lower ledge is stationary / MS train on upper ledge moves quickly, train on lower ledge move slowly / CU train full of rocks and dirt moves between two other trains