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2023 Natural Pozzolan Symposium

Rancho de los Caballeros, Wickenburg, Arizona

Rancho de los Caballeros, Wickenburg, AZ

PHOTOS: The Rancho de los Caballeros Resort.

JOIN US for the Biennial Natural Pozzolan Symposium, scheduled for May 16-18, 2023, to be held in Wickenburg, Arizona at the Rancho de los Caballeros Resort. The resort is booked exclusively for the NPA on those dates. Our first Symposium was held there in 2019, and those who attended enjoyed the many natural pozzolan related presentations in a beautiful southwest resort atmosphere. All meals are provided with your event registration. All you have to do is learn, teach, share and enjoy.

For those interested in presenting NP-related work at the Symposium, please see PRESENTATIONS, below.

ACCOMMODATIONS: There are rooms available on the resort property, but they are limited and booked on a first-come basis; when all available have been reserved, those wishing to participate will have to make off-site accommodation arrangements. IMPORTANT: Symposium rooms must be reserved by phone. Online reservations not available. Call the Rancho de los Caballeros at 800-684-5030 to reserve a room. For more information on the resort, visit their website:

REGISTRATION: The registration fee for the 2023 symposium is $425 and includes six meals—Tuesday evening: dinner (taco bar); Wednesday: breakfast, lunch, dinner (cowboy cookout); Thursday: breakfast, lunch. NOTE: Symposium registration does not include accommodations—those must be made via phone with Rancho de los Caballeros, per above.


SCHEDULE OF EVENTS: The Symposium kicks off with check-in at 4:00pm on Tuesday and ends at 6:00pm on Thursday. Those wishing to stay until Friday 11:00am may do so: meals for Thursday dinner and Friday breakfast are available at the resort but NOT included in the registration fee.

TUESDAY 5/16/23
4:00pm Check In Front Desk
6:00 – 8:00pm Dinner (Taco Buffet) Main Dining Room
7:00 – 9:30am Breakfast Buffet Bar Patio
10:00am – 12:00pm Meeting Sonoran Room
12:00 – 1:00pm Lunch Sonoran Room
1:00 – 5:00pm Meeting Sonoran Room
5:30pm Hay Wagon Corral
6:00 – 8:00pm Dinner (Cowboy Cookout) Yucca Flats
THURSDAY 5/18/23
7:00 – 9:00am Breakfast Buffet Bar Patio
9:00am – 1:00pm Meeting Sonoran Room
7:00 – 9:30am Breakfast Buffet Bar Patio
1:00 – 1:45pm Lunch w/ To-Go Option Sonoran Patio
1:45pm Check Out (Partial) Front Desk
1:45 – 5:45pm Visit to Kirkland Mine Meet at Front Desk
Symposium Concludes: those staying are on their own billing.
6:00 – 8:00pm Dinner Buffet Main Dining Room
FRIDAY 5/19/23
7:00 – 9:30am Breakfast Buffet Bar Patio
11:00am Check Out (Balance) Front Desk

PRESENTATIONS: For those interested in presenting their work at the Symposium, please send your presentation abstracts to no later than 1 March 2023 for review. Presentation should be no more than 20 minutes long; 15 minutes is preferred so we can have a couple of questions after each presentation. You may submit more than one presentation for review. The NPA is particularly interested in topics related to:

1) Water demand vs performance when using NPs compared to other SCMs —Performance can be measured by resistivity, compressive strength, ASR and Sulfate mitigation, among other metrics. Ongoing research indicates that natural pozzolans, due to their higher porosity vs fly ash and other SCMs, retain water in the concrete mix acting as an internal curing (IC) agent similar to light-weight aggregates used intentionally for IC purposes. This extra water allows for enhanced curing and the resultant benefits. Many mix designs with prescriptive w/c ratios are removing the possibility of using NPs which, at higher w/c ratio than those typically prescribed, provide as good or better performance as mix designs with other SCMs at much lower w/c ratios.

2) Pozzolanic Activity test methods that actually measure the NP’s ability to consume/react with calcium hydroxide to form additional C-S-H as indicated in the definition of a pozzolan (ASTM C125): pozzolan, a finely-divided siliceous or siliceous and aluminous material that will not react chemically with water, but will react with calcium hydroxide and water at properties. (2020) It is the intent of the NPA to eventually support the inclusion of one or more pozzolanic activity test methods into a future stand-alone natural pozzolan standard. Your presentations in this regard are very welcome.

3) NP’s performance metrics as it regards resistivity (bulk/surface), coulomb transmissivity, significant reduction in permeability, and enhanced density of the concrete matrix. Possibly in conjunction with durability impact (see #5) below.

4) Carbon content reduction—Recent EPD results indicate most raw NPs will have a GHGeq (carbon footprint) that is nearly 95% lower than OPC. Calcined NPs, which are fired at much lower temps than OPC clinker and do not emit carbon from the source material (as limestone does when fired), have an approximately 70% lower carbon footprint compared to OPC. Replacement of cement with NP at 10 - 50% by mass can have a huge positive impact on the carbon footprint of concrete.

5) Any testing/data relating to durability (ASR, sulfate attack, Chloride ingress, etc.) and strength enhancement - both early and long-term.

6) NPs used in geopolymer and alkali-activated cement research.

7) NPs incorporated into construction projects as a ready-mixed concrete component or as part of a pre-blended cement.

8) All other NP related research will be considered as well.

PAST SYMPOSIA reveal content


CR Minerals: Pozzolans from Mine Waste to Decarbonize Concrete. CR Minerals and Rio Tinto have agreed to produce pozzolans from waste materials at the U.S. Borax facility in Boron, CA reveal content

CR Minerals intends to use waste tailings present onsite to produce pozzolans that can be used as a cement replacement in concrete. The pozzolans will be manufactured at a new facility to be constructed by CR Minerals on Rio Tinto’s property as part of this agreement.

“We have been working with Rio Tinto for several years now to bring this concept to life. Taking what was once considered waste streams and turning them into usable products for the construction materials industry is part of the vision of our company. Manufacturing a low carbon alternative to cement will be an exciting venture in the State of California that prides itself on being at the forefront of effecting positive environmental change.” —Jeff Whidden, President, CR Minerals. SEE the November 08, 2022 press release for additional details.

Cover Story in Concrete Products Magazine: Pozzolan Proliferation. Writing in the July 2022 issue, Don Marsh explores the proliferation of portland cement alternatives, including...reveal content

new opportunities in coal ash harvesting and the increasing scrutiny of levels of embodied carbon in individual construction projects. The article addresses the role of natural pozzolans combined with recycled content to form a product to meet the growing demand for a low-carbon portland cement substitute, as well as related topics. DOWNLOAD the Concrete Products July 2022 issue (story begins on page 50).

Sunrise Resources: The Company is delighted to announce the issue of the mine permit for its CS Perlite-Pozzolan Project in Nevada, USA... reveal content

July 29, 2020—MINE PERMIT IS GRANTED. “This positive mine permit decision comes after 2-1/2 years of mine planning, environmental studies and reporting,” said Sunrise Executive Chairman Patrick Cheetham. “We can now move forward with the staged development of mining and mineral processing operations at the CS Project. This is required to secure offtake agreements and the grant of the mining permit will be a major catalyst in this process. The mine permit comes at a propitious time as cement industry demand is growing for natural pozzolan as a fly ash replacement and the horticultural demand for perlite is increasing with the rising cultivation of medicinal marijuana. We believe that this is a major value-adding milestone for the Company and puts the project firmly on the map as one of just a few permitted deposits of perlite and high quality natural pozzolan in the US.”

The CS Project is located approximately 24 miles northwest of Tonopah, in Esmeralda County, Nevada, USA and is held by the Company’s 100% owned subsidiary SR Minerals Inc. (SRM).

The BLM’s Environmental Assessment (EA) for the CS Project is now final. The BLM, having now evaluated the EA, has handed down a Finding of No Significant Impact (FONSI) for the Company’s Mine Plan of Operations and accordingly determined that an Environmental Impact Statement is not required per Section 102(2) (c) of the National Environmental Policy Act. The FONSI recognizes the positive contributions that the use of natural pozzolan can make to a reduction in CO2 emissions in the US as a replacement in the cement industry for the fly ash from coal-fired power stations.

FThe BLM has also issued its Decision Record approving and authorising the Company’s Mine Plan of Operations. This now allows the Company to develop the CS Mine according to that plan and in compliance with the various environmental mitigation measures and best practice measures proposed by the Company in its various submissions to the BLM. The BLM authorised Mine Plan of Operations covers the production of 1,656,000 tons of perlite and 14,523,000 tons of natural pozzolan over a 27-year period.

CONTACT: Patrick Cheetham, +44 (0)1625 838 884


Salt River Materials Group (SRMG): Latest capital investment at Tucson Electric Power site includes equipment to blend Class F fly ash from SRMG’s supply network with a regionally available natural pozzolan... reveal content

JULY 16, 2020—SRMG’S NEW BLEND OF FLY ASH AND NATURAL POZZOLAN SOLVES TUCSON’S SUPPLY DEMAND. In recent years securing a consistent supply of high-quality fly ash has been a challenge for some of the United States construction markets. Salt River Materials Group (SRMG), a fly ash and pozzolan marketer in the Southwest U.S. since 1973, understands the challenges of maintaining sufficient availability of quality products. For the past four decades, SRMG focused investment on innovative projects, such as beneficiation of otherwise unusable fly ashes, and now blending various sources of fly ashes and other pozzolanic materials to extend the supply of high-quality fly ash, typically used in ready-mix concrete production. On July 16, 2020 at its Tucson Terminal, SRMG commissioned its second blending facility.

Using the new precision blending equipment, SRMG incorporates ASTM C618 Class F fly ash from SRMG’s supply network with a regionally available ASTM C618 Class N natural pozzolan to create the resulting ASTM C1697 blended product. Marketed as “Tucson Pozzolan” the consistent, high-quality blend expands the availability of this critical material beyond previously available quantities in the market.

To prepare for importation of fly ash and natural pozzolan by truck or rail into the Tucson Terminal for blending, SRMG rehabilitated and expanded the existing infrastructure. In addition to the rail project, SRMG purchased and installed precision blending equipment and retro-fitted silos, providing safe and dust-free customer truck loading capability for Tucson Pozzolan.

At a time when coal-burning power plants are shutting down, potentially reducing fly ash availability, SRMG is focused on innovation. With another stable source of quality product added to the extensive supply network, Tucson Pozzolan will allow SRMG to maintain its reputation as a dependable and major fly ash marketer in the southwestern U.S. that can be trusted to deliver for years to come.

About SRMG: Salt River Materials Group (SRMG) is the commercial trade name for marketing activities of Phoenix Cement Company and Salt River Sand and Rock. SRMG, headquartered at the Salt River Pima-Maricopa Indian Community’s Chaparral Business Park near Scottsdale, Arizona, is the only Native American-owned producer of portland cement in the U.S., and is also a major manufacturer and marketer of sand and gravel and recycled coal combustion products (fly ash) and pozzolans throughout Arizona and the southwestern United States.

CONTACT: Dale Diulus / James Carusone • 480-850-5757


CR Minerals: Announcing the expansion of operations in Pueblo, CO. The expansion will more than triple the production output of the facility... reveal content

June 5, 2020


FORT WORTH, TX – CR Minerals, a leading manufacturer of pumice products and construction materials, has announced the expansion of its operations in Pueblo, CO. The company will be investing over $11 million and adding approximately 8 more jobs to its existing staff over the next three years. The expansion will more than triple the production output of the facility enabling CR Minerals to serve its customers in Colorado and surrounding states well into the future.

The CO facility focuses on the production of a patented remediated fly ash (Tephra® RFA) as well as other products (Tephra® OG and Tephra® NP) that are geared toward the construction materials as well as oil and gas industries.

“We are very excited about the expansion of our plant in Pueblo,” said Jeffrey Whidden, President of CR Minerals Company. “The continued growth of our business in CO and declining availability of high- quality fly ash for our customers are the driving forces behind our decision. Expanding the plant at this time, even in these uncertain economic conditions, will enable us to serve our customers uninterrupted for years to come. As part of this expansion, we once again thank the City of Pueblo, PEDCO, and the area’s workforce for their continued support.”

The City of Pueblo through the Pueblo Economic Development Corporation (PEDCO) has provided funding for the expansion in the amount of $160,000 as part of the City’s half cent fund for economic development. “Pueblo is thrilled to be selected as the location for CR Minerals’ continued expansion.” said Jeff Shaw, President and CEO of PEDCO.

About CR Minerals Company, LLC: CR Minerals Company, headquartered in Fort Worth, Texas is a global leader in pumice products and is a manufacturer of pozzolanic materials (natural pozzolans and remediated fly ashes) for the construction and oil and gas industries. CR Minerals has operations in New Mexico and Colorado and is based in Fort Worth, Texas.

CONTACT: Elizabeth Palacios, Pueblo Office Manager • (719) 239-7867 •


Kirkland Mining Company: Kirkland Mining Company (KMC) has partnered with Boral Resources—America’s leading manufacturer of fly ash products—to develop KMC's natural pozzolan mining operation near Kirkland, Arizona... reveal content

August, 2020


Boral Resources will excavate and grind natural pozzolan in a facility to be constructed on KMC private lands near Kirkland, Arizona, 90 miles northwest of Phoenix. Production is expected to ramp up to approximately 500,000 tons per year.

Construction at the Kirkland site is scheduled to commence fall 2020 with site-clearing activities. All site clearing will be conducted in a manner to protect local wildlife corridors. Following site preparation, a light manufacturing facility that will include dryers and grinding equipment will be built at the site.

Kirkland high-quality natural pozzolans will play a crucial role in improving the quality of concrete products and infrastructure across several western states. Kirkland high-quality natural pozzolans feature unique chemistry and morphology (physical shape and makeup) that make their performance in concrete competitive with, and often better than, the highest-quality fly ashes and natural pozzolans currently in the market. Additionally, their distinct and special value in the marketplace, and Kirkland’s relative proximity to several large end-use markets, make the site’s development economically and logistically preferable to other natural pozzolan deposits located in very isolated areas.

In addition to improving concrete quality, natural pozzolan use results in significant environmental benefits. Each ton of natural pozzolan used in concrete effectively eliminates the production of 0.8 to 1.0 tons of carbon dioxide emissions through direct displacement of the production of portland cement. Pozzolan use in the United States today annually reduces greenhouse gas emissions by more than 12 million tons.

For the past several decades, fly ash produced by coal-burning power plants has been the dominant pozzolan used in concrete production. But as these power plants close in response to environmental consideration and competition from other energy sources, demand for pozzolans from other sectors is increasing rapidly. The Kirkland high-quality natural pozzolan may be used as a direct substitute for fly ash.

ABOUT KIRKLAND MINING COMPANY: A family-owned Arizona corporation, Kirkland Mining Company completed the stringent process for obtaining all necessary approvals to mine the high-quality natural pozzolan deposit near Kirkland, Arizona. In late 2019, the company joined forces with Boral Resources to proceed with mining and marketing of this unique deposit.

ABOUT BORAL RESOURCES: Servicing 135 locations in 45 states, Boral Resources is the nation’s leading marketer of fly ash products and natural pozzolans. The company operates an extensive distribution network for fly ash and related products and provides site services to power plants.

CONTACT: KMC • 480-209-1103


The Natural Pozzolan Association (NPA) is a network of natural pozzolan producers working to improve the performance and durability of the nation’s concrete infrastructure.


100 East 155 South, Malad City, ID 83252

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