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About Us



Geofortis is a holding company with divisions that are focused on developing its portfolio of product and services to sell natural mineral products at an extraordinary value to its customers. Our corporate center supports each division with financing, refining the business/marketing strategies, and administrative services, as well as strategic guidance in mitigating the risks of entering and scaling to meet new market opportunities.

At the core of Geofortis is an age old pozzolan mineral that has successfully met the needs of many industries and customers. Prior to the widespread use of certain industrial waste by-products as concrete additives, natural pozzolans were successfully used as a raw ingredient in concrete to improve performance and durability. As environmental and safety issues have emerged with man-made geopolymers, the need for safe and environmentally attractive alternatives has increased. Geofortis is bringing natural pozzolans that have a proven track record of meeting these needs back to the market.

The pozzolan minerals have also been commercially used in the flame retardant, fluid management, environmental remediation and soil amendment industries. For more information on our business divisions please visit or click on any of the boxes below.


Geofortis Pozzolans

UC Davis Demonstration

UC Davis Demonstration of a Geofortis Pozzolan Blend

Geofortis Operations Overview An Interview with Jim Pierce – Past President of ACI and Chairman of ASTM Listen to Dr. Marie Jackson on The Use of Natural Pozzolans In the Past and Future Dr. Doug Hooton provides his insights into pozzolans past, present and future An Interview with Bud Werner on The Use of Natural Pozzolans In the Past and Future Dr. Michael Thomas discusses the use of pozzolans in the concrete and cement Industry past, present, and future Tim Dolen discusses natural pozzolans past, present and future. Introduction to a Series of Interviews and Discussions on the Use of Natural Pozzolans in the Concrete Industry Operation Glen Canyon Dam


Geofortis Pozzolans’ products use a natural pozzolan formed by volcanic ash deposited over thousands of years in a fresh water lake populated by diatomaceous algae in northern California. This unusual mineral has the potential to solve many of the technical challenges facing the concrete industry today, including ASR, efflorescence, porosity, and reducing greenhouse gas emissions.

From ancient Roman pozzolan concrete structures that have stood for millennia to modern concrete structures and products, natural pozzolans have a demonstrated ability to produce high performance and durable concrete. Innovations in product development and changing market forces now allow Geofortis to bring back a superior and proven natural pozzolan to meet the demand for high performance and cost-effective concrete solutions.

The Product

Geofortis Pozzolans sells, ships and provides services for our natural pozzolans to customers in the western US by rail or truck. Our natural pozzolan was successfully used from the 1950’s – 80’s in projects such as the Auburn Dam, Los Melones Dam, Palos Verdes nuclear power plant, and the Trans-Canada Highway. In the past, this mineral was calcined and processed in ball mills, but Geofortis has now developed and tested processes to deliver an un-calcined, finely milled product as a stand along mineral, or as a blend that meets today’s building and construction market needs.

Our raw, uncalcined product provides maximum benefit in CO2 impact calculations by replacing Portland cement and Class F pozzolan. The light beige color is excellent for most customer applications. Geofortis currently sells our unprocessed pozzolans for customer milling and will be selling milled pozzolans in late 2016. For information about purchasing our products, please contact:

Frequently Asked Questions

  • Will the Geofortis’ Pozzolans be calcined?
  • Will the Geofortis Pozzolan be an ASTM C618 approved material?
  • How much Geofortis Pozzolan raw material does Geofortis control?
  • How consistent is the source?
  • Will there be technical support for the use of Geofortis’ pozzolans?
  • Is Geofortis pozzolan going to replace fly ash or Portland cement?
  • Which geographic markets will Geofortis serve?
  • What is pozzolan and what does it do?

No, new grinding technology and better understanding of the product allow the use in natural form, ground to the proper fineness and gradation.

Yes, testing demonstrates excellent results and will exceed ASTM C618 and other industry standards.

Geofortis has conducted surface and core sampling over our 3,000 acres of mineral claims and an independent geologist estimates over 150 million tons of pozzolan material is present.

Our geologic, mineralogical and chemical testing and quality control processes provide confidence in the consistency and reliability of our products.

Yes, Mike Donovan is our President with over 30 years of experience in the concrete industry.  He oversees our technical support and QA/QC staff to work directly with customers and their engineers and technicians to develop mix designs, troubleshoot production questions, and optimize cost effectiveness.

Pozzolans typically replace a portion of the Portland cement in concrete mixtures as one type of Supplementary Cementitious Materials (SCM).  Our pozzolan may be used in place of or in combination with other SCMs, such as fly ash, to maximize efficiency and performance of concrete mixtures.

Our current mineral reserves are near Reno, NV and we have purchased and begun development of an 18 acre industrial site in Reno.  These can serve most of California to Salt Lake City and the Pacific Northwest by rail and Northern California and Nevada by truck.  We are also evaluating additional pozzolan sources in other areas of the US to replicate our Reno operations.

A pozzolan is a material consisting of non-crystalline silica and alumina which, in itself, possesses little or no cementitious value but which will, in finely divided form and in the presence of water, react chemically with calcium hydroxide at ordinary temperature to form compounds possessing cementitious properties.  When Portland cement and water react, they form calcium silica hydrates (CSH), the “glue” that gives concrete or mortar its strength.  Calcium hydroxide is a byproduct of this reaction and is detrimental to concrete performance.  Pozzolans convert that calcium hydroxide to CSH, improving the strength, durability and performance of concrete.

For More Information on Pozzolans

Research Library Past Newsletters Video Library

Geofortis Processing & Logistics

Natural Products For A Better Tomorrow

Geofortis Processing and Logistics is developing a mineral processing facility in Reno, Nevada. We purchased this unique rail served vacant property in 2015.  The facility exists directly on a rail line that will provide economical shipment throughout the western United States.  Our site is just minutes from a freeway and within a one-day driving distance of markets throughout California, Nevada, Oregon and as far east as Salt Lake City.

We have selected the milling, mixing, and handling equipment to complete the processing facility to produce supplementary cementitious materials, including pure natural pozzolan and blended products with fly ash and other pozzolans. The equipment has been selected to specifically meet the requirements of our pozzolans and to meet our customer’s needs and demands. Our current plans are to bring this facility online as quickly as possible without sacrificing the integrity of the design, installation and testing of the equipment to ensure that we can produce products to the highest standards.

Our facility will also house state-of-the art testing and quality control instrumentation to ensure the consistency and quality of our processed products are delivered to specification. Our reputation for exceptional and reliable products is intended to be the hallmark of our processing and logistics business units.

The facility is planned to be created and organized to support contract mineral processing in the Reno, Nevada area. If you are interested in learning more about our mineral processing plans and capabilities, please contact us directly to learn more.

Geofortis Minerals

Supplying a Natural Alternative

Geofortis Minerals currently develops and manages our 3000 acre mineral resource in Northern California. We currently have rights to over 150 million tons of a consistent natural pozzolan known as Lassenite the is easily mined from the surface.

The Geofortis mine is located directly on a rail spur and a major U.S. highway, making the shipment of our mineral directly to customers or to our mineral processing business units reliable and cost effective.

The mining and production site includes extraction, drying, handling, storage, and bagging capabilities to support end to end collection and distribution of our mined products.

We work diligently with all stakeholders at the local, regional, state, and federal level to ensure that we are compliant with all regulatory requirements to operate our mine safely and without harm to our employees, the local community, and the environment. Our reclamation plans will leave the land in healthy condition for the generations to come.

Soil Amendment

Preserving Precious Resources


Geofortis Lassenite® has been sold as a soil amendment for over a decade for use in sports turf, golf courses and agriculture. Customers bought Lassenite® for Its fine, porous structure that holds water for plant use and improves irrigation efficiency by as much as 35% – 50% depending on the specific application. In certain environments it has also been shown to reduce compaction, improve soil aeration and improve fertilization efficiency.

With water conservation as a global imperative for improved agricultural production, Geofortis is developing enhanced soil amendment products in partnerships with academic researchers, growers associations, trade groups, and water districts interested in improving the health and viability of plants while conserving water usage.

The Product

Geofortis’ Lassenite® consists of microscopic diatoms embedded in volcanic ash, which provides high porosity and capillary water holding capacity. It holds nearly its own weight of water. When appropriately applied as a soil amendment, Lassenite® can yield a high percentage of its water to plant roots and prevent water from percolating out of reach. These factors result in greater irrigation conservation and efficiency. Depending on the climate, soil conditions and specific plants, water savings have been demonstrated to be up to 35-50%.

Lassenite® is a stable mineral that will not decompose, degrade or diminish in beneficial properties. Once it is mixed with soil and remains in situ, it will continue to perform. For further information on purchasing Lassenite® as a soil amendment please contact:

Research & Development

Geofortis is actively engaging expert teams of agronomists, plant scientists, soil scientists, and hydrologists from major research institutes and academia to assist in developing improved soil amendment products, as well as delivery and application methodologies. We are building on commercial research and field trials of Lassenite® completed over the last 10 years.

As an example of one of our strategic partnership, we are working with Desert Research Institute (DRI) and the research arm of the Nevada System of Higher Education. DRI is a cutting-edge global applied research organization with extensive plant, soil and water conservation research facilities and scientists. DRI is working with Geofortis to improve our products to deliver enhanced plant productivity and irrigation efficiency. For further information on DRI’s review of literature on our Lassenite® and similar materials, please follow the following link to a summary of their findings.

For more information on our work with DRI

Geofortis Labs

Innovation in Pozzolan Blends




Chett Boxley

R&D Advisor and Scientist

Chett has a proven track record converting pure research to on-the-shelf products with extensive expertise as a PhD Chemist in material science, organic synthesis, concrete, and the beneficial utilization of minerals.

Learn more about natural pozzolans here Read the latest soil amendment research and news

Geofortis Labs performs research and product development to support new uses of our natural pozzolans. We focus our R&D efforts on identified high value market opportunities that will fulfill an unmet market need. We also prioritize our work based upon speed to market but without compromising the development of a superior product.

Our R&D team performs chemical analysis, geological analysis, proof of concept testing, process design, and material testing to refine, supplement, and create new materials for applications such as concrete additives, pet litter, water management, heat resistance, and flame retardants. For further information about these products please contact:

We perform these services using internal resources and by working with independent laboratories so that we can take advantage of the best equipment and industry knowledge available.

If you are interested in learning more about our R&D programs or are interested in collaborating on the development of our pozzolan products and services, please contact us.

Contact Us

Electron Microscope images of our natural pozzolans


We bring over 30 years of experience in the cement, concrete and construction industry to the solutions, products and services we deliver to the market.

Jim Bowen

CEO and Board Member

Jim brings over 12 years of experience in the construction industry to Geofortis and over 40 years experience in finance, accounting, business development and operations.

David McMurtry

Chief Operating Officer

Dave has over 35 years of experience in engineering and construction management and specializes in innovation. As a former executive within a large E&C firm with 8 recent years of startup experience, he brings Geofortis operations expertise to deliver quality, reliability and efficiency.

Mike Donovan P.E., FACI

President Geofortis Pozzolans

Mike brings over 30 years of experience in the cement and concrete industry to Geofortis. He serves on a number of American Concrete Institute and CALCIMA committees including as a member of the ACI 240 National Pozzolans committee.

Tim Alford

Vice President Finance

Tim has in-depth knowledge about financing, financial structuring, and developing funding agreements.


We have an experienced and valuable advisory board that actively participates in assisting Geofortis review its business strategy, market opportunities, and our fund’s growth and development.

Mickael Flaa


Mickael has 20 years of successful financial and executive management background and he brings deep experience from his 22 years at KPMG.

Carl Marrs

Board Member

Carl has over 14 years experience as an executive that has provided substantial dividends and returns for investors during his stewardship.

Grant Gordon

Board Member

Grant has over 27 years experience in the biotech & mining sectors building and developing private and public Companies from startup through liquidity events.

Corey Flaa

Board Member

Corey is a serial entrepreneur with experience in all aspects of operations and finance. He has helped public and private companies achieve their objectives.

Latest News

For the Latest News, Updates and Information on Geofortis

  • Tim Alford Joins Geofortis
  • Geofortis Pozzolans Completes Full Scale Demonstration of New Product
  • Justin Hulbert Joins Geofortis Pozzolans
  • Video Series on Natural Pozzolans
  • Mike Donovan Joins Geofortis
  • Cal Minerals becomes Geofortis

MORAGA, Calif., March 28, 2017 — Geofortis today announced that Tim Alford, has joined Geofortis as Vice President, Finance, reporting directly to Jim Bowen, CEO of Geofortis.

“I am thrilled that Tim has joined our team,” said Jim Bowen, CEO of Geofortis. “He brings a wealth of experience and knowledge about finance, financial structuring, and developing financing agreements. He shares our values and our focus on maximizing value for our shareholders and the customers we will serve.  We are confident that Tim will help us move successfully into the future.

Geofortis ( is a diversified pozzolan technology and manufacturing company focused on serving customers in the western United States seeking pozzolan based products and services. Based in Moraga, CA., Geofortis is a privately held company. For more news and information on Geofortis, please visit


Press Contacts:

Jim Bowen

phone: (305) 509-1615

Reno, NV. February 17, 2017 – Geofortis Pozzolans announced the completion of a successful demonstration of its latest Supplementary Cementitious Material (SCM) product in conjunction with the UC Davis Department of Civil Engineering. This product, a blend of LasseniteTM natural pozzolan and other materials, improves the performance and reduces the cost of concrete. Concrete was batched by Syar Materials at its Rio Linda plant and transported by ready mix truck to the UC campus. A demonstration slab was poured and finished under the supervision of Geofortis’ Mike Donovan and UC Davis lab staff. QC testing was performed by third party engineering firm.

The demonstration allowed attendees, which included prospective customers, specifying engineers, and representatives from CalTrans, to view the material and interact with the concrete contractor. A presentation about the SCM product and current specification requirements was also provided. A test report will be available in approximately 30 days.

A video showing highlights of the event and comments from the finisher are available by clicking HERE.

Geofortis Pozzolans Completes Full Scale Demonstration of New Product 021717 v2

About Geofortis: Geofortis Pozzolans ( is an SCM technology and products company focused on serving the concrete industry in the western United States. Based in Reno Nevada., Geofortis Pozzolans is a privately held company. For more news and information on Geofortis, please visit 

Press contacts: Mike Donovan
phone: 925-878-1459

JHulbert small

MORAGA, Calif., March 22, 2016 — Geofortis today announced that Dustin Hulbert, PhD, has joined Geofortis Pozzolans as Director of Research and Development, reporting directly to the Geofortis Pozzolan’s President, Michael Donovan. Prior to joining Geofortis, Dustin worked at CalStar Products for over 6 years where he helped research, develop and launch the company’s fly ash based masonry products. Dustin has deep knowledge of cementitious and pozzolanic materials. He has a Ph.D. in Materials Science from UC Davis where he studied advanced ceramic materials.

“I am thrilled that Justin Hulbert has joined our team,” said Mike Donovan, President of Geofortis Pozzolans. “He brings a wealth of experience and knowledge about using pozzolans to enhance the performance of concrete. He also shares our values and our focus on providing innovative products and services to the concrete industry.  We are confident that Dustin will help us develop extraordinary cementitious additives using our pozzolan.

Geofortis ( is a diversified pozzolan technology and manufacturing company focused on serving customers in the western United States seeking pozzolan based products and services. Based in Moraga, CA., Geofortis is a privately held company. For more news and information on Geofortis, please visit


Press Contacts:

Jim Bowen

phone: (305) 509-1615

Geofortis is pleased to announce the production of a series of video interviews and a panel discussion on the use of natural pozzolans from the past, present and future, to address the needs of the concrete and construction industry. This series will be released in January and early February of 2016 and was filmed during the November 2015 ACI convention in Denver Colorado.  Experts discuss the potential of natural pozzolans to address issues that the concrete industry is facing today and in the near future.

The series includes commentary from the leading pozzolan experts in the industry. The production was sponsored by Geofortis to stimulate new ideas, resurrect old ideas, share knowledge and fuel discussions about pozzolans and how they can improve the durability and sustainability of concrete. To view the introduction to the series click here.


MORAGA, Calif., April 13, 2015 /PRNewswire/ — Geofortis today announced that Mike Donovan, formerly the Director of Quality Assurance and Research for Central Concrete, has joined Geofortis Natural Pozzolans as President, reporting directly to the Geofortis Natural Pozzolan’s Board of Directors. This news comes as the ACI Concrete Convention in Kansas City kicks off and coincides with Geofortis’s name change from Cal Minerals to Geofortis, reflecting the company’s broader natural pozzolan commitment.

“I am thrilled that Mike Donovan has joined our team,” said Mickael Flaa, Chairman of the Geofortis Board of Directors. “He brings a wealth of experience and knowledge about the concrete industry to our company. He also shares our values and our focus on providing innovative geopolymer products and services to the concrete industry. Mike has shown himself to be an extraordinary leader throughout his career and has a proven track record.

” Donovan will have overall responsibility for the strategic direction, expansion and operation of Geofortis Natural Pozzolans, which will be supplying a proven high performance natural pozzolan to the concrete industry.

Mike Donovan and Geofortis will be attending the ACI Concrete Convention in Kansas City starting April 13th and we look forward to seeing you there. (More information on ACI can be found at

About Geofortis:
Geofortis ( is a diversified geopolymer technology and manufacturing company focused on serving customers in the western United States seeking natural pozzolan products and services. Based in Moraga, CA., Geofortis is a privately held company. For more news and information on Geofortis, please visit


Press Contacts:
Jim Bowen
phone: (305) 509-1615

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MORAGA, Calif., April 13, 2015 /PRNewswire/ — Cal Minerals Inc. – a supplier of natural pozzolans to the western United States – announced today that it is changing its corporate name to Geofortis The name change reflects the company’s broader natural pozzolan commitment and its expertise in driving the innovations needed to shape the future of natural pozzolans as a geopolymer across a broad range of industry needs.

Geofortis will be attending the ACI Concrete Convention in Kansas City starting April 13th and we look forward to seeing you there. (More information on ACI can be found at

“The new name – Geofortis – allows us to emphasize our wide-ranging business objective around changing the way geopolymers are delivered and used by companies seeking natural and safe solutions to achieve their product performance needs. Our goal is to provide cost effective access to natural pozzolans while providing enhanced performance and quality products,” said Jim Bowen, President of Cal Minerals, soon to be Geofortis.

Geofortis includes the company’s concrete and cement replacement products and services division. It also includes its planned mining and mineral processing divisions as well as potential additional geopolymer divisions for soil amendments, flame retardants, and specialty mineral raw materials.

Along with the new name, Geofortis has developed a new corporate logo and website that can be found at The name change will be made effective over the next 2 weeks.

About Geofortis:
Geofortis ( is a diversified geopolymer technology and manufacturing company that intends to serve customers in the western United States seeking natural pozzolan products and services. Based in Moraga, CA., Geofortis is a privately held company. For more news and information on Geofortis, please visit


Press Contacts:
Jim Bowen
phone: (305) 509-1615

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+1 925 272 2600

Office Address

1024 Country Club Drive, Suite 160

Moraga, CA 94556