April Dinner Meeting

Please join us on April 20 at McFate Brewing Company.

Our speaker will be Dr. Jan Rasmussen presenting on Wulfenite in Arizona.

Abstract:

‘Wulfenite in Arizona’ by Jan Rasmussen

Arizona is famous for its spectacular wulfenite specimens, such as the butterscotch-colored, bladed crystals from the Glove Mine south of Tucson. A recent bill in the Arizona legislature has designated wulfenite to be the state mineral.

 

Wulfenite (lead molybdate) forms in the oxidized zones of lead-zinc-silver deposits during later periods of alteration. The best large samples of wulfenite are associated with Laramide (~75 Ma), Jurassic (~190 Ma), or mid-Tertiary (~25 Ma) lead deposits where there are permeable fault zones with open space, open channelways, or caves. Microscopic specimens of wulfenite are associated with the later stages of porphyry copper or other types of ore deposits in the lead-zinc zones. Surprisingly, wulfenite does not occur in the presence of molybdenite, but rather occurs in close proximity to cerussite (lead carbonate) that has been altered from galena.

 

Museum quality specimens of wulfenite occur at the Glove Mine in the northwestern Santa Rita Mountains of Laramide age and at the Silver Bill, Defiance, Mystery, and Tom Scott mines in the Turquoise district (Courtland-Gleeson area in Cochise County) of Jurassic age. Mid-Tertiary age wulfenite samples are found at the Red Cloud Mine in La Paz County, Rowley Mine in Maricopa County, Old Yuma Mine in the northern Tucson Mountains, and the Mammoth-St. Anthony Mine at Tiger, AZ north of San Manuel.

 

Biography:

Dr. Jan Rasmussen is a consulting geologist in Tucson, specializing in writing permitting documents, such as Aquifer Protection Permits and Mine Plan of Operations, for consulting companies, such as SRK Consulting and other clients. As a Registered Geologist in Arizona and a Qualified Person with registration from SME, Jan has written Canadian National Instrument 43-101 reports for mining clients. Jan’s work in economic geology has included exploration for metallic and industrial mineral resources and most recently research with MagmaChem Exploration into ultra-deep hydrocarbon resources in the North Sea for a Norwegian oil company.

Jan earned a Ph.D. in economic geology from the University of Arizona in 1993 and then worked for Woodward-Clyde as a geochemist/economic geologist on the Yucca Mountain project in Nevada. Jan’s work there was recently published in the 2015 Geological Society of Nevada symposium volume.

Jan’s most recent full time job was as Curator of the Arizona Mining and Mineral Museum in Phoenix from 2007 through 2010.  Jan received the SME Individual GEM award in 2010 for her work in educating children about the importance of mining in their lives. Her interest in wulfenite started with her early research into molybdenum in Arizona with the Arizona Bureau of Mines (now the Arizona Geological Survey).

Throughout her career, Jan has been committed to educating people about geology and has taught Physical, Historical, and Environmental Geology as adjunct faculty for the University of Arizona, Austin Community College, Cochise College, and Pima Community College.

Jan has coauthored 14 books or open file reports on Arizona geology and numerous articles, most of which are available as pdf files on her website www.janrasmussen.com. Jan has recently started a photographic website, www.MiningMineralMuseum.com  about the Arizona Mining and Mineral Museum as it was in 2010.

 

RSVP HERE!

 

 




January 2017 Dinner Meeting

GROUNDWATER RECHARGE – SITING, DESIGN, OPERATION, AND ENHANCEMENT by Geno Mammini, R.G.

Geno Mammini, R.G. is a senior project hydrogeologist at Clear Creek Associates with over 16 years of experience in hydrogeologic and environmental consulting.  Geno graduated with his Bachelor of Science degree in Geology from California State University – Sonoma in 2000.  Geno is a Registered Geologist in Arizona and Washington, and is the groundwater chair for the Tri-State Seminar, an annual event held in Las Vegas that focuses on educating water professionals.  Geno has managed the design and construction of numerous public supply wells, ASR wells, vadose zone injection wells, and groundwater recharge basins, and has also conducted studies to enhance performance of recharge facilities.

Groundwater recharge remains an important water resources management tool in the southwest.  However, with today’s economic conditions, public and private entities alike must get the greatest return possible for each recharge investment dollar.  That is why it is critical to properly locate, construct, and operate recharge facilities to maximize their capability to efficiently recharge groundwater, both in the short-term and over the long haul.  This presentation will review types of recharge technologies including vadose zone methods and direct injection systems, and will discuss factors that should be considered during each stage of the recharge project from siting through design and ultimately operation.  Case studies will be sited to support hydrogeologic and costing assumptions.

Thank you to our sponsor, Clear Creek Associates and Geo-Logic Associates:

clear-creek-logo




U of A Event

Pete Reiners, Chair of UA Geosciences, invited AGS members to Dr. Bruce Clark’s presentation on “Natural Disasters: What we know and what we don’t”.

The next speaker at University of Arizona Geosciences will be Dr. Bruce Clark who will talk about “Natural Disasters: What We Know and What We Don’t” on November 16, 2016. Dr. Clark will talk generally about disasters but focus on earthquake and landslide hazards based on experience from his long career working with seismic hazards in California. His scientific research and its application to preparedness for use by local governments will provide insights to students interested in learning how being a geoscience major can translate research into work that can directly impact people’s safety and lives.

For more info: http://www.geo.arizona.edu/Programs




Dinner Honoring Lee M. Allison

In honor and remembrance of Arizona’s late state geologist, Lee M. Allison, several colleagues and friends have organized a special event including an afternoon field trip and an evening dinner event. The afternoon field trip event is still being organized and will be on the afternoon of November 19, 2016. The dinner event is planned on November 19, 2016 at  Tohono Chul Park, 7366 N. Paseo del Norte, Tucson, Arizona. There is no cost to this event as it is sponsored by:

AEG – Association of Environmental & Engineering Geologists
AGS – Arizona Geological Society
AZGS – Arizona Geological Survey
AIPG – American Institute of Professional Geologists
ARPA – Arizona Rock Products Association
SABC – Southern Arizona Business Coalition

Evening Event: Celebrating the life of Lee Allison @ Performance Garden of Tohono Chul Park

Day / Time: November 19, 6:00–10:00 pm
Light dinner and drinks provided (cash bar)

Those planning to attend the evening celebration, please RSVP to Kristi Sagar.




Field Trip Honoring Lee M. Allison

In honor and remembrance of Arizona’s late state geologist, Lee M. Allison, several colleagues and friends have organized a special event including an afternoon field trip and an evening dinner event. The afternoon field trip event is still being organized and will be on the afternoon of November 19, 2016. The dinner event is planned on November 19, 2016 at  Tohono Chul Park, 7366 N. Paseo del Norte, Tucson, Arizona. There is no cost to this event as it is sponsored by:

AEG – Association of Environmental & Engineering Geologists
AGS – Arizona Geological Society
AZGS – Arizona Geological Survey
AIPG – American Institute of Professional Geologists
ARPA – Arizona Rock Products Association
SABC – Southern Arizona Business Coalition

Field Trip: Debris-Flow Hazards of the Santa Catalina Mountains and Quaternary Evolution of Piedmont Fans

Day / Time: November 19, 12:30–5:30 pm
Leaders: Ann Youberg and Phil Pearthree of the Arizona Geological Survey
Transportation: TBD
Field trip guide provided gratis by Arizona Geological Survey

Those planning to attend the afternoon field trip, please RSVP to fmconway@email.arizona.edu.




October 2016 AEG Meeting

For more information click here.




February 2016 AEG Meeting

For more information click here.




2014-2015 Richard H. Jahns Distinguished Lecture

For more information click here.




July 2015 AEG Meeting

For more information click here.




June 2015 AEG Meeting

For more information click here.