1. Maps showing anomalous copper concentrations in stream sediments and heavy-mineral concentrates from the Ajo and Lukeville 1⁰?x 2⁰ quadrangles, Arizona Yale Public content 1987. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Arizona.