Economic Geology, 2001, V 96, N 2, March-April.

A Special Issue Devoted to Porphyry Copper Deposits of Nothern Chile
John H. Dilles and Francisco Camus, Editors

Preface
Francisco Camus and John H. Dilles
233

Aeromagnetic Signature of Porphyry Copper Systems in Northern Chile and Its
Geologic Implications 
Gerardo Behn, Francsico Camus, Pedro Carrasco, and Hunter Ware
239

Geology of the Chuquicamata Mine: A Progress Report
Guillermo Ossandón C., Roberto Fréraut C., Lewis B. Gustafson, Darryl D.Lindsay,
and Marcos Zentilli
249

Geologic Evolution of the Escondida Area, Northern Chile: A Model for
Spatial and Temporal Localization of Porphyry Cu Mineralization
Jeremy P. Richards, Adrian J. Boyce, and Malcolm S. Pringle
271

Geology of the Escondida Porphyry Copper Deposit, Antofagosta Region Chile 
Ruben A. Padilla Garza, Spencer R. Titley, and Francisco Pimental B.
307

Multiple Centers of Mineralization in the Indio Muerto District, El Salvador, Chile 
Lewis B. Gustafson, Walter Orquera, Michael McWilliams, Mario Castro, Osman
Olivares, Gonzalo Rojas, Juan Maluenda, and Marcello Mendez
325

Chronology of Exotic Mineralization at El Salvador, Chile, by 40Ar/39Ar
Dating of Copper Wad and Supergene Alunite  
Timothy I. Mote, Tim A. Becker, Paul Renne, and George H Brimhall
351

Application of Mass-Balace Modeling of Sources, Pathways, and Sinks of
Supergene Enrichment to Exploration and Discovery of the Quebrada Turquesa
Exotic Copper Orebody, El Salvador District, Chile
367
Timothy I. Mote, George Brimhall, Enrique Tidy-Finch, Guillermo Muller, and
Pedro Carrasco

Oxide Mineralization at the Radomiro Tomic Porphyry Copper Deposit, Northern 
Chile 
Patricio Cuadro C. and Gonzalo Rojas S.
387

Atacamite Inclusion in Rock Forming Feldspars and Copper-Bearing Smectites
from the Radomiro Tomic Mine, Chile: Copper Insoluble Mineral Occurrences
George H. Brimhall, Beatriz Levi, Jan Olov Nystörm, and Enrique Tidy F.
401