Arizona Geological Society

Events

Upcoming events

    • 05 Mar 2019
    • 6:00 PM - 9:00 PM
    • Sheraton, 5151 E Grant Rd. (& Rosemont), Tucson AZ 85712
    Register



    Sponsored by:  Basin Wells Associates PLLC


    Treasures and Formation of Arizona's Sky Islands:  Geology and Mineral Resources of Coronado National Forest

    by Sarah E. Baxter, Mineral Resources Project Manager and Zone Geologist of Nogales Ranger District, Coronado National Forest 

    Abstract:  Coronado National Forest (“Forest”) contains approximately 1.853 million acres (7,200 km2); dominantly occurring in the high mountain ranges of south to southeastern Arizona and southwestern New Mexico.  The Forest occupies parts of Cochise, Graham, Greenlee, Pima and Santa Cruz Counties of Arizona and Hidalgo County New Mexico.  The geology of the Forest is very diverse and highly variable, which reflects the complex geologic history of this region.  Much of the geologic record of the region, which is part of the Basin and Range geologic province, contains intercalated sedimentary and volcanic rocks composing seven (7) major sequences that have been intruded during at least five (5) magmatic events; a geologic record stretching from the Precambrian to the late-Tertiary.  This region’s high mountains and broad-flat low valleys gave rise to its unique nickname: Arizona’s Sky Islands.  Not surprisingly, because of the Sky Island’s unique geologic nature and evolution, Coronado National Forest is the most biologically diverse of all lands managed by the USDA – Forest Service.

    The mineral resources of the Forest have been investigated and mined by various inhabitants, visitors and prospectors for thousands of years.  Silver (Ag) has been produced from mantos vein deposits and epithermal deposits.  Gold (Au), Ag, and lead (Pb) have been produced by fissure-hosted and carbonate replacement deposits as well as contact metasomatic deposits known as skarns.  The largest and richest deposits on the Forest are world-class porphyry Copper (Cu) deposits, which have produced Pb, Cu, zinc (Zn), Au, Ag, and molybdenum (Mo).  Most of these porphyry-Cu deposits reside outside of the Forest, except in the Patagonia, Pajarito, Santa Rita, and Chiricahua Mountains.  Other productive mineral resources occur within the Dragoon, Whetstone, Huachuca and Santa Catalina mountains.  The Forest contains a diverse list of mineral resources and potential ore deposits including the following: tungsten skarn, tungsten vein, porphyry-Cu, porphyry-related Cu skarn, polymetallic replacement, porphyry Cu-Mo, polymetallic vein, Creede-type epithermal vein, rhyolite-hosted tin (Sn), and placer Au.  It is the treasures of Arizona’s Sky Islands that continue to tempt the small prospector as well as large international mining companies to explore; not only in the Forest’s past but also into the future.

    Bio:  Sarah is 6th-generation native Californian (her family established residency in California as early as 1850) originally from Torrance, California.  At the age of 5, she learned mineral prospecting and geology while working the family placer claim in San Bernardino National Forest. In 1999, she graduated from the University of California, Davis with a degree in Political Science and worked for five years in Law, Government Administration and Environmental Policy.

    In 2008, Sarah sought to redefine her career and graduated from Oregon State University (OSU) with a Bachelor’s of Science in Geology. Her undergraduate research thesis focused on an underground orogenic gold deposit and was entitled: Mineralogy of Gold-Quartz Veins of the French Gulch District, Shasta County, California. Her work was funded by a department scholarship for academic excellence.

    Following graduation from OSU, Sarah worked as a brownfields exploration geologist for Freeport-McMoRan in Morenci, Arizona. Following work in Alaska for Pathfinder Mineral Services and Sumitomo Metal Mining in 2009, she formed Klondike Mountain Geological Services and worked as an independent geologist, awarded contracts with Kinross Gold Corporation, Hudbay Minerals, and ASARCO.

    In 2015, Sarah earned her Professional Science Master’s degree in Economic Geology from the University of Arizona. As a graduate student, she was awarded the 2013-2014 SRK Consulting Scholarship for Academic Excellence and her Master’s thesis was entitled: Calc-Silicate Alteration and Ore Characterization, ASARCO Mission Complex: Implications for the Optimization of Molybdenum Recovery.

    In January 2017, Sarah joined the US Forest Service where she administers several minerals projects including the Rosemont Copper Project.  Her diverse career ranges from helicopter-supported reconnaissance field geologist in the Alaskan Interior, near mine-site exploration and being a production geologist at both underground and open pit operations in Nevada, Alaska, Washington, and Arizona to Minerals Administration for the US Forest Service.

Past events

05 Feb 2019 Jeffrey E. Post presents The Hope Diamond and Smithsonian National Gem Collection
08 Jan 2019 John Dilles presents - Using the Zonation of Trace Metal Geochemistry and Hydrothermal Mineralogy for Porphyry Copper Mineral Exploration
04 Dec 2018 David (Duff) Gold presents - Deep-Seated Volcanism and the Genesis of Diamonds
06 Nov 2018 William Wilkinson Presents - The Good, The Bad and The Ugly: Three Decades of Exploration
02 Oct 2018 Ihor Kunasz Presents - The Geology and Economics of Lithium
04 Sep 2018 Jim Reed Presents - Applying Geological Exploration Methods Towards the Location of Clandestine Gravesites
07 Aug 2018 Rhodochrosite: Red Treasure of the Rockies - The Story of the Sweet Home Mine
03 Jul 2018 Alison Jones Presents - Rafting through 2 Billion Years of Geologic Time
05 Jun 2018 Gary Huckleberry Presents - The Geoarcheology of Ancient Water Control in the Southwest: Lessons from the Past
01 May 2018 William B. White presents The Science of Caves and Cave Contributions to Science
21 Apr 2018 Spring Field Trip - Jerome - An Early Proterozoic Volcanogenic Massive Sulfide Deposit
03 Apr 2018 Volker Spieth and Stanley Keith Present - Finding Gold in the Kupferschiefer
29 Mar 2018 Future Home of the University of Arizona Gem and Mineral Museum
06 Mar 2018 Joe Wilkins, Jr. Presents - Piedras Verdes and Cuatro Hermanos, Sonora, Mexico - A Tale of Two Porphyries
06 Feb 2018 Paul F. Hlava presents Causes of Color in Minerals and Gemstones
02 Jan 2018 Peter L. Ward presents Bringing Peace to the Climate Wars
05 Dec 2017 Joellen Russell presents The Ocean's Role in the Climate of the Anthropocene
07 Nov 2017 Eric Sundquist presents Geological Perspectives on Carbon Dioxide, the Carbon Cycle and Carbon Management
03 Oct 2017 Lily Jackson presents Andean River Sediments as a Window into the Tectonic History of Ecuador
05 Sep 2017 Vic Baker presents The Influence of the 18th Century Enlightenment on the Natural Sciences
22 Aug 2017 AGS Meet and Greet, A Networking Event
11 Jul 2017 Andrew Zaffos presents Global Tectonics and Marine Animal Diversity
06 Jun 2017 Dan Johnson presents Introduction to the Florence Copper Project and In-Situ Copper Recovery
02 May 2017 Robert Glennon presents America's Water Crisis and What To Do About It
22 Apr 2017 Spring Field Trip - The Laramide-age Chilito Porphyry Copper Deposit
04 Apr 2017 David London presents The Nature and Origins of Internal Zonation within Granitic Pegmatites
07 Mar 2017 Derek J. Thorkelson presents The Precambrian Tectonic Connection between Yukon and Arizona
07 Feb 2017 Daniel Hummer presents Mineral ecology and evolution: Using large datasets to tell the story of the co-evolution of Earth and life
03 Jan 2017 David A. Sawyer presents Dating Geologic Time in the Cretaceous: Integrating Biostratigraphy, Isotope Geochronology, and Astrochronology in Sedimentary Deposits of the Cretaceous Western Interior Seaway
06 Dec 2016 John W. Ewert presents USGS Responses to Some Volcanic Crises and Eruptions Around the World
01 Nov 2016 Alexander Schauss presents Minerals, Trace Elements and Human Health
22 Oct 2016 Fall Field Trip - The Peach Spring Tuff and the Silver Creek Caldera, Northwestern Arizona
04 Oct 2016 Hamish Martin Presents Geology of the Resolution Cu-Mo Deposit, Superior Arizona
06 Sep 2016 Keith R. Long Presents No Bonanza from Cheap Oil
02 Aug 2016 Lee Allison Presents The Future of State Geological Surveys: the Arizona Case Study
05 Jul 2016 Don Applebee Presents Genesis of the Chilito Porphyry Copper Deposit
07 Jun 2016 Robert Hildebrand Presents Collisions, Slab Failure Magmatism and the Development of Cordilleran Batholiths
03 May 2016 Peter Modreski will present "Pegmatites: Mineralogy, Gemstones, Economic Geology, and maybe not quite the same Giant-Crystal Rocks you always thought they were"
30 Apr 2016 Spring Field Trip - An Introduction to the Pinal Schist in Southeastern Arizona
05 Apr 2016 Jordon Bright Presents Looking for an Ocean in the Desert, the Enigmatic Bouse Formation
01 Mar 2016 Peter R. Johnson Presents Tectonics and Mineral Deposits of the Arabian-Nubian Shield
02 Feb 2016 Dr. Karen Wenrich Presents The Ga-Ge Rich Apex Mine, Utah - A Tsumeb, Namibia Analogue
05 Jan 2016 Sarah Baxter Presents Calc-silicate Alteration and Ore Characterization, ASARCO Mission Complex, Pima County, Arizona
01 Dec 2015 Peter Smith Presents The Latest News from Mars
14 Nov 2015 Fall Field Trip - Northern Plomosa Mountains and Bouse Formation in Blythe Basin
03 Nov 2015 Karen Kelley presents The Giant Concealed Pebble Cu-Au-Mo Porphyry Deposit, Southwest Alaska
06 Oct 2015 Caleb King presents Eocene Hydrothermal Systems and Contrasting Hydrothermal Alteration in the Battle Mountain District, Nevada
01 Sep 2015 Carl Bowser presents The Genesis of the Kramer Borax Deposit, Rogers Lake, Mojave Desert, CA:
04 Aug 2015 Dan Lynch presents Volcanoes in the Back Yard
07 Jul 2015 Erik Melchiorre presents The Complex Geological History Recorded by Arizona Placer Deposits:
02 Jun 2015 Jan C. Rasmussen Presents - Arizona Mineralization through Geologic Time
05 May 2015 Gordon Haxel Presents - Alpine peridotite in the desert - Arizona's Laramide subduction complex
02 May 2015 Spring Field Trip - Oak Creek - Mormon Lake Graben
18 Apr 2015 Third Annual Arizona Geological Society Doug Shakel Student Poster Event
03 Mar 2015 Apollo 17 Astronaut and Former Senator Harrison H. Schmitt presents A Geological Visit to a Valley on the Moon
03 Feb 2015 Don Yurewicz Presents Assessing Unconventional (Continuous) Hydrocarbon Resource Plays
06 Jan 2015 Arend Meijer presents: Sulfide-rich Proterozoic Mafic Rocks and Arizona Porphyry Copper Deposits - A Connection?
02 Dec 2014 Victor R. Baker: Megafloods on Earth, Mars, and Beyond
15 Nov 2014 Fall Field Trip - Debris Flows Shape the Sabino Canyon Landscape - look out below!
04 Nov 2014 Isabel F. Barton: Historical Development & Current State of Geological Research in the Central African Copperbelt
07 Oct 2014 Apollo 17 Astronaut and Former Senator Harrison H. Schmitt presents A Geological Visit to a Valley on the Moon
02 Sep 2014 Lewis Land presents Evaluation of Groundwater Residence Time in a Karstic Aquifer System
05 Aug 2014 Jamie Molaro presents Thermal Stress Weathering in the Inner Solar System
01 Jul 2014 Jim Leenhouts presents Surface-water/groundwater Interactions in Arizona
03 Jun 2014 Arend Meijer presents Pinal Schist of So. Arizona--A Paleoproterozoic Fore-Arc Complex
06 May 2014 John C. Lacy presents The Genesis of Mining Law
26 Apr 2014 Spring Field Trip - Geology of the Christmas Porphyry Copper Deposit
24 Apr 2014 Second Annual Arizona Geological Society Doug Shakel Student Poster Event
01 Apr 2014 Eric Seedorff presents, Structural Dismemberment of a Porphyry Molybdenum System, Spruce Mountain District, Northeastern Nevada
04 Mar 2014 John Dreier presents, Copper Deposits of the Coast Ranges of Chile; A trip through time, space, and ore deposit nomenclature
04 Feb 2014 Ralph Stegen presents The Morenci Porphyry Cu-Mo Deposit, Greenlee County, Arizona: A Geologic Summary with Emphasis on Hypogene and Supergene Mineralization
07 Jan 2014 Steve Castor presents, Mountain Pass and other North American Rare Earth Element Deposits
03 Dec 2013 Stephen Jackson, USGS, Looking forward from the past: Ecological impacts of climate change through the lens of history
05 Nov 2013 Malcolm Siegel, PhD, MPH, LJS Consulting, Inc and School of Medicine, University of New Mexico, Albuquerque, NM. 87047: Uranium Mining in the American Southwest: Can Medical Geologists Ask the Right Questions?
04 Oct 2013 Field Trip - H. Wilson Sundt Generating Station
01 Oct 2013 Mark Logsdon, Principal Geochemist, Geochimica, Inc.: What Does “Perpetual” Management and Treatment Mean? Toward a Framework for Determining an Appropriate Period-of-Performance for Management of Reactive, Sulfide-Bearing Mine Wastes
01 Oct 2013 Mark J. Logsdon, Geochimica, Inc., Does acid-rock drainage lead to waste-rock instability? Geological, hydrological, and geochemical framework for the Questa Mine
03 Sep 2013 Pete Reiners, UA, Geosciences Dept., Geochronology of secondary Fe & Mn oxides in bedrock
30 Aug 2013 Field Trip - University of Arizona Tree-Ring Research Laboratory
06 Aug 2013 Bill Stavast, Freeport-McMoRan Copper & Gold, The Safford Mine: What we have learned since production began
02 Jul 2013 Lukas Zurcher, USGS, presents: "Tectono-magmatic evolution of the Central Tethys Region"
04 Jun 2013 Steve Van Nort presents, "Gold Fever! The BRE-X/Busang Story
07 May 2013 Federal lands and mineral resources: Colorado Plateau uranium deposits and the Sonoran Desert Heritage
18 Apr 2013 First Annual Arizona Geological Society Doug Shakel Student Poster Event

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