Geology & Resource Overview – Class “N” Natural Pozzolan

Environmental Minerals Inc. is advancing a large, high-purity natural pozzolan (volcanic ash) deposit in Inyo County, California, to serve low-carbon cement and concrete markets across the Western United States.

A detailed geology and drill programme, led by Industrial Minerals Developments Inc. (Frederic C. Johnson, P.G., Geologist), confirmed a substantial, homogeneous volcanic-ash ore body suitable for premium Class “N” applications.

Current internal estimates indicate approximately 258 million tons of high-grade natural pozzolan at Site A, with additional larger tonnage potential identified on the adjoining Site B. Together, these resources position the project as a long-life industrial minerals asset for infrastructure, commercial construction and specialty applications.

ASTM C618 Performance & Material Testing

Independent ASTM C618 testing was performed by Resource Materials Testing Inc. (RMTI) of Murphy, North Carolina, a specialist pozzolan and fly-ash laboratory led by Dr. Robert L. Smith, Ph.D.

Test results confirm that Environmental Minerals’ material meets the requirements of ASTM C618 for Class “N” natural pozzolan in the parameters evaluated. Blaine fineness results of approximately 7,060 cm²/g indicate a finely processed, high-reactivity pozzolan suitable for:

  • High-performance ready-mix and precast concrete.
  • DOT and transportation-infrastructure applications.
  • Durable, low-permeability mixes for marine and sulfate-exposed structures.
  • Low-carbon blended cements targeting improved long-term strength.

Recent trial mixes and producer evaluations have demonstrated excellent strength development, workability and durability, reinforcing the deposit’s suitability for premium SCM (supplementary cementitious material) markets.

Assay & Geochemistry – ALS Global

Comprehensive assay and geochemical characterisation of the ore body have been completed by ALS Geochemistry (ALS Global) at its Reno, Nevada facility.

These results confirm consistent chemistry, low impurity levels and a mineralogical profile aligned with high-grade natural pozzolan. The data support continued ASTM C618 compliance, performance modelling for blended cements and compatibility with major cement-plant feed specifications.

Environmental & Technical Studies

Environmental baseline and technical studies have been prepared by Stantec, a global engineering and environmental consultancy, together with independent geology, drilling and performance-testing programmes.

The project benefits from a historic record of natural pozzolan production on the same volcanic-ash trend, including material previously used in major California infrastructure such as the Los Angeles Aqueduct system and associated dam structures. Existing access, utilities and regional infrastructure support rapid scaling of industrial operations as market demand expands.

Vertical Integration & Advanced Products

In addition to supplying bulk Class “N” pozzolan for cement and concrete, Environmental Minerals is progressing a roadmap for vertically integrated products that leverage the broader mineral resource, including:

  • Basalt-fibre–reinforced polymer (BFRP) rebar and next-generation composite reinforcement designed to deliver high strength at a fraction of the weight of steel.
  • Advanced composite systems targeting enhanced corrosion resistance and long-life performance for bridges, coastal structures, ports and marine assets.
  • Potential dual-use applications in agriculture and water-retention media, utilising the pozzolan’s fine particle size and favourable porosity.

This integrated approach positions Environmental Minerals as both a strategic SCM supplier and a platform for future low-carbon, high-performance materials.