Emergency crews have called off the search and rescue operation at a gold mine in Far East Russia’s Amur region, where 13 miners were trapped by a rockslide two weeks ago, the mine’s operatorsaid Monday. “It was decided to stop the rescue operation at the Pioneer mine on April 1,” operator Pokrovsky Rudnik said in a statement. “The lives of the rescuers and mine workers involved in the operation are in danger due to the high probability of a repeated collapse and flooding,” it added. Rescuers have been unable to establish contact with the Pioneer miners since a rock collapse on March 18, thoug…