Volume 38 of Reviews in Mineralogy provides detailed reviews of various aspects of the mineralogy and geochemistry of uranium. We have attempted to produce a volume that incorporates most important aspects of uranium in natural systems, while providing some insight into important applications of uranium mineralogy and geochemistry to environmental problems. The result is a blend of perspectives and themes: historical (Chapter 1), crystal structures (Chapter 2), systematic mineralogy and paragenesis (Chapters 3 and 7), the genesis of uranium ore deposits (Chapters 4 and 6), the geochemical behavior of uranium and other actinides in natural fluids (Chapter 5), environmental aspects of uranium such as microbial effects, groundwater contamination and disposal of nuclear waste (Chapters 8, 9 and 10), and various analytical techniques applied to uranium-bearing phases (Chapters 11-14). This volume was written in preparation for a short course by the same title, sponsored by the Mineralogical Society of America, October 22 and 23, 1999 in Golden, Colorado, prior to MSA's joint annual meeting with the Geological Society of America.

The, Uranium Seekers, saga began in 1976 when world-famous Hollywood, California photographer, Martin, was contracted to come to Utah and begin documenting, paying photographic tribute to, uranium miners, native Americans, and the Vanadium King uranium and vanadium mines on Temple Mountain, Emery County, Utah. The essence of the project was to pay tribute to the persons who traversed Zane Grey's and John Ford's great western expanse in search of uranium ore, one rock at a time, from before Madame Curies trips to the, then, present, and to remind the world's public that uranium was, and still is, used to kill, not humanity, rather cancer. I harbored the hope that by going back to the first uranium rocks the nuclear industry would re-evaluate the physical structure of nuclear reactors, one cubic yard at a time. Nuclear reactors, when built, witness Fukushima Daiichi, are still being created with too much haste. Like the uranium miners themselves, it's the hands of the humanity who cast the cement forms in which the reactors rest which determines safety. I also, rather naively, hoped when uranium's harmonous utilization was embraced its destructive military reality, throughout the world, would melt. Even with the support of the fine Beverly Hills, California literary agent, Clyde M. Vandeburg of Vandeburg-Linkletter Associates who represented Ronald and Nancy Reagan, Barry Goldwater, and many others at the time, the national and international events at Three-Mile Island and Chernobyl put Uranium Seekers and Martins great photographs to bed for decades. However, recently I learned the Utah Historical Quarterly Unpublished Manuscripts from the Department of Community and Culture at the Utah State Archives had harbored some of the manuscript material for decades and the recent events at Fukushima Daiichi made uranium part of the international conversation once again, I decided to dust off Martin's work and snatches of the original material for Uranium Seekers.

In the course of the hundreds of Rio Chama rafting trips that we've logged during the last 30 years, none of us has ever had a bad trip. Such is the magic of the Rio Chama. No matter the weather, the water level, the season, the crowded Big Eddy boat ramp on a blistering Sunday afternoon, or even the coffee forgotten at home, the Rio Chama remains "The People's River." Its stunning beauty, plus its exceptional camping, user-friendly whitewater, and mostly predictable flows, combine to create one of the Southwest's premiere, multi-day, river running experiences.The spectacular, towering canyon walls of the Wild & Scenic section through the remote Chama River Canyon Wilderness is New Mexico's own "Grand Canyon." The geology of the Rio Chama is so exceptional that this river is ideally suited for a river guide with a geological theme. And so, following the release of the Rio Grande geologic river guide in 2011, we turned our (part-time) attention to the Rio Chama. Although most Rio Chama recreation is focused on the El Vado to Big Eddy stretch, thedecision was easily made to include the entire boatable section, from the highlands in Colorado to the confluence with the Rio Grande, as each section of the river displays its own visual spectacles and assortment of adventures. Plus, the geology is magnificent and diverse along the entire length of the river.