Royal Peacock Mining Co:
http://www.royalpeacock.com/

Opal Queen Mining Co:
http://www.opalqueen.com/

Bonanza Opal Mines Inc:
http://goldnuggetwebs.com/BONANZA

Rainbow Ridge Opal, Inc:
www.nevadaopal.com 

America's Opal
http://www.virginvalleyopal.com/

Information on the Winnemucca area and services:
http://www.winnemucca.nv.us/ 

American Opal Society:
http://www.opalsociety.org/

Nevada Bureau of Mines and Geology:
http://www.nbmg.unr.edu/ 

Sheldon National Wildlife Refuge:
http://sheldon-hartmtn.fws.gov/index.html

Panoramic Views:
Thanks to Ron Morgan for contributing these fantastic 360° views of Virgin Valley sites:

Campgrounds/ Hot Spring

Rainbow Ridge Opal Mine

The following is a partial list of publications which have featured articles about Virgin Valley Opals: