Where did the bulk of the placer gold in Tertiary river sediments in California come from?…maybe Nevada!

This paper further expounds on this alternative theory of the origin of California placer gold is available here.

Christensen, Odin D., Christopher D.Henry, and Jim Wood, 2015, Origin of gold in placer deposits of the Sierra Nevada Foothills, California, Geological Society of Nevada Symposium 2015.


Geology of the Ione Formation in the Ione Area

This document is now available in the References Section.  It is Part B of the Guidebook for the Fieldtrip conducted for the 1995 Association of Engineering Geologists Annual Meeting in Sacramento CA.

Two Power Point slide shows of GSA Cordilleran Annual Meeting presentations now available for viewing in the documents section

The complete slide sets and slide notes for two oral presentations discussing the mineralogy and petrology of the auriferous gravels and their downstream equivalents are now posted in the documents section.

click here