Model Reveals the Recipe for High-Grade Ore Deposits (2 of 3) (image) American Association for the Advancement of Science Share Print E-Mail Caption Copper-bearing vein (about 1cm maximum thickness) cross-cutting earlier quartz veins at El Teniente deposit, Chile. This image relates to a paper that appeared in the Nov. 15, 2012, issue of Science Express, published by AAAS. The paper, by Philipp Weis at ETH Zurich in Zurich, Switzerland, and colleagues was titled, "Porphyry-Copper Ore Shells Form at Stable Pressure-Temperature Fronts Within Dynamic Fluid Plumes." Credit Image courtesy of ETH Zurich Usage Restrictions Please cite the owner of the image when publishing. This image may be freely used by reporters as part of news coverage, with proper attribution. Non-reporters must contact Science for permission. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.