Skip to Main Content
Book Chapter

Discovery of the Silver-Rich Juanicipio-Valdecañas Vein Zone, Western Fresnillo District, Zacatecas, Mexico

By
Peter K. M. Megaw
Peter K. M. Megaw
IMDEX Inc. P.O. Box 65538, Tucson, Arizona, 85728
MAG Silver Corp, Suite 770, 800 W. Pender St., Vancouver, British Columbia, Canada V6C 2V6
Search for other works by this author on:
Published:
January 01, 2010

Abstract

The 2003 to 2006 discovery of the important Juanicipio-Valdecañas vein zone in the western part of the famous Fresnillo silver district was the result of 10 years of research and geologic fieldwork predicated on the idea that the Fresnillo district was much larger than conventionally believed. High levels of vein exposure, extensive cover, and weak surface geochemical signatures have historically hampered exploration in the district and arguably resulted in a limited perception of the overall system. Nevertheless, new exploration success was the consequence of a continuation of discovery history in the district, just with a wider application of established concepts and broader scope of vision.

Information from published studies and reconnaissance field observations from the district were combined with improved academic understanding of the importance of variations in boiling levels in low-sulfidation epithermal vein systems to generate the concept that the extensive alteration zone, 5 km west of the Fresnillo mine, concealed additional veins. However, detailed geologic mapping, geochemical sampling, and geophysical surveys were required to convince investors that the concept was worth pursuing. The spectacular successes validate the work and demonstrate that several mineralization centers, with different boiling depths, were active in different places at various times in the district. This creates new exploration possibilities for the Fresnillo district and suggests that seeking vertically and laterally shifting mineralization centers in any large epithermal vein camp may be fruitful, particularly where mining and exploration have been confined to relatively limited areas or within vertically restricted zones.

You do not currently have access to this article.

Figures & Tables

Contents

Special Publications of the Society of Economic Geologists

The Challenge of Finding New Mineral Resources: Global Metallogeny, Innovative Exploration, and New Discoveries

Richard J. Goldfarb
Richard J. Goldfarb
Search for other works by this author on:
Erin E. Marsh
Erin E. Marsh
Search for other works by this author on:
Thomas Monecke
Thomas Monecke
Search for other works by this author on:
Society of Economic Geologists
Volume
15 (1)
ISBN electronic:
9781629490397
Publication date:
January 01, 2010

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal