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"Arizona Mining Review" covers breccia pipe uranium, USGS mineral resource plans

The June episode of Arizona Mining Review is now on YouTube at interview with Dr. Jon Spencer, Chief Geologist here at AZGS, about his new report on potential uranium-bearing breccia pipes in northwest Arizona is drawing a lot of attention. Show More Summary

New report indicates massive increase in uranium potential in northwest Arizona

We released our new report yesterday “ Partial database for breccia pipes and collapse features on the Colorado Plateau, northwestern Arizona ” ( ) that found concentrations of breccia pipes 10 to 100 times higher than previously known, in two test study areas. Show More Summary

A Watering Hole Bites the Dust: Water Hole #1

Water Hole #1 in Golconda, Nevada — a bar made famous in the late 1970s by an industrious pig, Waterhole Ike — closed sometime within the last two to three years, before I had a chance to stop by and check out their beer collection. Water Hole #1 and attached grocery store in March, 2015. Show More Summary

New exhibit of historical mining maps opens in Tucson

The Arizona Historical Society has opened a new exhibit in Tucson of the map collection of Robert Lenon. Robert Lenon was a surveyor and mining engineer from Patagonia, Arizona. In addition to creating a vast number of maps depicting...Show More Summary

On Oakland’s blueschist

It may seem like I have a fixation on blueschist. I’ll admit that. I have a fixation on every rock type. Here’s a fine blueschist boulder at the very north end of Castle Drive, in the Piedmont Pines neighborhood. This qualifies as a knocker, and it also qualifies as a high-grade block. “Knocker” is local […]

Bill introduced to overturn Resolution copper mine land exchange

Two Arizona congressmen, Raul Grijalva (Tucson) and Ruben Gallego (Phoenix), introduced legislation to reverse the federal land exchange that is allowing the giant underground Resolution copper mine to be developed near the town of Superior. Show More Summary

State Geologists field trip into Petrified Forest National Park back country

The post-meeting field trip for the 107th Annual Meeting of the Association of American State Geologists (AASG) went to Petrified Forest National Park and Meteor Crater last Thursday.Park naturalist and paleontologist Adam Marsh ledShow More Summary

State Geologists annual meeting underway in Flagstaff

AZGS is hosting the 107th Annual Meeting of the Association of American State Geologists (AASG) in Flagstaff this week. Over 150 attendees are participating from state geological surveys, federal counterparts, professional organizations, and industry. Show More Summary

El Niño at Honey Lake

After our brief stay at The Nugget during the first part of our journey last month, we made a brief foray north on Highway 395, then quickly retreated southward along the same road. When we stopped at the Honey Lake Rest Area, it was raining hard in a localized but intense shower. Show More Summary

Lobe 8 of the Fan: Evergreen Cemetery hill

Cemeteries occupy some of Oakland’s nicest hillsides. Evergreen Cemetery, unlike the others, has a whole hill to itself. The hill consists entirely of sand, silt and gravel laid down in a large alluvial fan (the Fan) back some time in the Pleistocene. Later, stream erosion cut the Fan into pieces, which I have numbered west […]

Headed into the Back of Beyond (Again)

2 months agoAcademics / Geology : Geotripper

I had hoped to finish our blog journey through the most dangerous plate boundary, but there was just too little time between real-world trips. The next journey is taking me and nearly two dozen students on a trip through time, both geological and anthropological. Show More Summary

Wildcat Silver changes name to reflect growing interest in lead, zinc

Interesting news item that Wildcat Silver Corporation has changed its name to AZ Mining Inc. The new website is The company said the change "reflects both the Company's focus on its Hermosa property located...Show More Summary

Call for Papers — 2015 AHS Symposium

We got this announcement today: The Phoenix Chapter of Arizona Hydrologic Society (AHS) is soliciting abstracts for papers and posters to be presented at the 28th Annual Symposium. The symposium is a premier event in the Southwest for hydrology and water resources science, engineering, and public policy. Show More Summary

Soft-story buildings

Let’s take a minute to think a bit about public policy. Think about when Oakland’s next major earthquake strikes. Remember, the Hayward fault is considered capable of causing an earthquake of magnitude 7.5 or even larger. According to a compelling memo by acting manager Henry Gardner issued last year on the 25th anniversary of the […]

A Geologist (also named Hayes) Sits Through "San Andreas", the Movie

2 months agoAcademics / Geology : Geotripper

What the heck is this? These are fault slickensides (scraping marks from fault motions) at Hoover Dam. Where the movie says there are no faults. I love sitting through geology-based movies, so I can sit and smirk at the screen and criticize the horrible geology presented therein. Show More Summary

Driving Through the Most Dangerous Plate Boundary in the World: A Gentle Landscape Belies a Fiery Past

2 months agoAcademics / Geology : Geotripper

As we leave the Great Valley behind on our journey through the most dangerous plate boundary in the world, we finally enter the world of the Sierra Nevada. Many may think of Yosemite Valley or Lake Tahoe when the Sierras are mentioned, but the mountains rise modestly from the west side. Show More Summary

Short Course: Geology of the Central Sierra Nevada, June 12-14: And What a Great Setting!

2 months agoAcademics / Geology : Geotripper

Have you ever had the desire to learn about the geology of the Sierra Nevada in a spectacular mountain setting. Baker Station near Sonora Pass just north of the Yosemite National Park is the home base of the High Sierra Institute, and my colleague Noah Hughes is teaching a short field course on the geology of the Sierra Nevada on June 12-14. Show More Summary

Sunset Crater, San Francisco Volcanic Field

Sunset Crater is the youngest cone in the San Francisco volcanic field in northern Arizona. Over the past 6 million years, more than 600 volcanic cones formed, with an eruption every 3,000 years on average. Sunset Crater may have erupted during the winter of the year 1064-1065. Show More Summary

No volcanic activity at Sunset Crater according to Park Service

The National Park Service issued a news release this afternoon in response to an internet claim that a steam cloud was produced by Sunset Crater near Flagstaff. NPS stated " activity has been observed on the ground by park rangers...Show More Summary

"Steam plume" from Sunset Crater is likely just smoke from forest fire

A report of a purported "steam cloud" from Sunset Crater near Flagstaff appears to be mis-identification of a smoke plume from a Forest Service prescribed burn near A-1 Mountain a few miles to the southwest that passed over the crater, or possibly an orographic cloud formation in the lee of San Francisco Peak. Show More Summary

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