Copper Mountain, Wyoming, USA
THE COPPER MOUNTAIN URANIUM PROJECT
TIER 1 URANIUM DISTRICT
Wyoming hosts the largest-known uranium ore reserves in the United States and is now the focus of incoming investment.
- The state leads U.S. in uranium production, home to 5 operating uranium mines (all ISL).
- Wyoming accounts for 69% of all domestically mined uranium, strong potential for large-scale uranium discoveries.
- Strong support for uranium development from the Wyoming State government.
DISTRICT SIZE WITH INFRASTRUCTURE
Copper Mountain is one of the largest uranium projects in Wyoming.
- Copper Mountain has a 10k + acre land package with 7 historic deposits and 15 additional targets.
- Myriad is completing their option on 75% of the project (Currently at 50% ownership). Consolidation of 100% is being discussed.
- Myriad the first to consolidate ownership of the Copper Mountain District in over 50 years.
RESOURCE EXPANSION
Historic work provides a launchpad for rapid resource expansion.

1950s-1960s
Legendary geologist and Myriad technical advisor Jim Davis discovers the Arrowhead Mine. 500 klbs was produced at a grade of 0.15% and 500 klbs is estimated to remain.
1970s
Union Pacific Railway drilled 2,000 boreholes discovering 7 deposits during the 70’s.
- They envisioned a conventional hub & spoke, 6-pit mine plan centered on the Canning deposit with estimated resources for its mine plan of 15.7 – 30.1 Mlbs (Indicated and Inferred).
- Union Pacific estimated the potential of the 6-pit mine plan and additional targets (estimated and speculated) to have over 65 Mlbs of mineralization potential.
- Union Pacific had designed a leach pad and had plans to commence mining in 1983, but dropped those plans in ~1980 after prices plummeted following Three Mile Island incident.
Anaconda Copper drilled 19 boreholes into the Railroad Target adjacent to Union Pacific’s Copper Mountain project.
- They had a discovery hole of 13.8m @ 330 ppm (incl 2m @ 1000 ppm) From 177m in depth.
- Crucially tested for deeper mineralisation associated with thrust faults.
1990s
Anaconda Uranium (no relation to Anaconda Copper) acquired all the historical data in the early 90’s and spent several years analyzing the data.
- They focused on an “Area of interest” at the Canning deposit.
- Two review reports (1991 and 1997) confirmed that Copper Mountain has mineable reserves with heap leach potential, and possibly an ISR option.
- Both recommended bulk sampling and testing as part of further work.
2006-2012
Neutron Energy & Strathmore both held parts of the Copper Mountain Project. Their ownership had separated the Canning deposit and most of the entire project.
Neutron Energy brought back geologist Jim Davis and re-evaluated all the historical data which was summarized in a 2008 technical report.
- Suggested the equivalent uranium grades used in the historic resources were conservative and noted that fluorometric analyses suggested higher grades but were disregarded.
- Recommended various programs targeting the three styles of uranium deposits.
Note: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
GRANITE-RELATED DEPOSITS
Importance
- Historic drilling mainly targeted graniterelated mineralization (e.g. North Canning).
- Uranium mineralization hosted in faults and fractures.
- Similar deposits mined historically in Europe:
– France over 63,000 tU (79% of total)
– Czech Republic over 82,000 tU - Currently mined on large scale in China:
– 20 economical U deposits with recoverable reserves of 20,000 tU.
FAVOURABLE GEOLOGY
Multiple Deposit Types
- Historic drilling mainly targeted granite-related mineralization (e.g. North Canning).
- Associated sedimentary mineralization (e.g. Arrowhead).
- Possibility of roll-front mineralization in Tertiary sediments (e.g. Cedar Ridge).
- Possibility of deeper thrust/unconformity-related mineralization (e.g. Railroad).
COPPER MOUNTAIN PROGRESS
Consolidate and Acquire the Copper Mountain Project
- Myriad optioned into 75% from Rush Rare Metals. Currently at 50%. Has spent $4.5 of the $5.5M req’d to earn 75%.
- Myriad has almost doubled its land position to include the historically-defined deposits and targets in the district.
Acquire Historic Data
- Acquire data relating to the US$86 million in historic spend (2024$) at the project.
“Myriad Transformed as Data Trove Reveals Significant Historical Uranium Resources at Copper Mountain” – Oct 2023 news release.
Commence Myriad’s Maiden Drill Program
- Confirm historically reported mineralization with Fall 2024 maiden drill program.
- Focus on the Canning deposit which was the cornerstone of Union Pacific’s 6-pit mine plan which had historical resource estimates in the range of 10-20 Mlbs (Indicated and Inferred).
Next Steps
- Report upcoming ~1,500 assays from gap sampling.
- Drill at other targets around Copper Mountain to confirm the broader potential of the district.
- Continue testing deeper zones below historical 175m general maximum depth of drilling.
*Not current under NI 43-101: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
CANNING DEPOSIT

Historical Drilling
- ~820 holes were drilled in the Canning deposit by Union Pacific, generally to a maximum depths of around 180 m.
- Bulk of historic resources: 10-20 Mlbs (Indicated and Inferred).
- Priority target area contains higher average grades.
Note: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
Myriad’s Drilling
- Focused on the priority target area, known to contain higher grades.
- 34 holes completed (RC and DD).
- Best grade interval: 5,337 ppm over 1.28 m from 68.7 m (CAN0004).
- Best GT interval: 4,361 ppm over 2.29 m from 80.9 m (CAN0006).

ASSAYS
Assays from 34 holes have now been compared to the initial results from the spectral gamma probe, and the assays confirm much higher grades. In the 1970s, Union Pacific only used probe data to estimate resources and plan the mine.
- Historic resources from Union Pacific relied on DFN probe data, which was considered conservative.
- 1970s fluorometric assays indicated that DFN probe could be underestimating grades, but the results were disregarded in favor of DFN probe data.
- Currently reported ICP-MS results show that chemical grades are in fact better, and gaps may also contain significant unreported U.
Assays across the 34 boreholes to date show the following…
- 60% higher grades at 1,000 ppm eU3O8 cut-off.
- 50% higher grades at 500 ppm cut-off.
- 20% higher grades at 200 ppm cut-off.
- CAN0034 had a >250% improvement in grade from 344 ppm eU3O8 to 833 ppm U3O8 over 0.5 m at 454 m depth.
ASSAYS REVEAL HIGHER GRADES AND DEEPER MINERALIZATION

Note: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
PRIORITY TARGETS
NUMEROUS PRIORITY TARGETS GUIDED BY HISTORIC DATA




Note: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
EXPLORATION: LOW-RISK DEPOSITS WITH HISTORIC RESOURCES




Note: For more information about historic resources and current exploration results, refer to the sections at the end of this page.
NOTES TO DISCLOSURE OF HISTORIC INFORMATION
Copper Mountain, Wyoming
The following sources of information are relevant to the historic resource or grade estimates referred to in this document:
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David S. Robertson & Associates, Inc. (January 6, 1978). Technical Review of the North Canning Project.
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Rocky Mountain Energy Corp. (1978). Copper Mountain Development Report, Third Quarter Report.
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Rocky Mountain Energy Corp. by Southard et al. (1979). Copper Mountain Exploration Project Report.
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Rocky Mountain Energy Corp. (1980). Copper Mountain Development Interim Report.
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Nelson, C.E. for Rocky Mountain Energy Corp. by Nelson (1980). Copper Mountain Project Report.
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Madson, M.E., Ludlam, J.R. and Fukui, L.M. for Bendix Field Engineering Corporation (1982). Copper Mountain, Wyoming, Intermediate-Grade Uranium Resource Assessment Project Final Report.
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Liller, G.K. for Anaconda Resources Inc. (1991). Summary Report of the Copper Mountain Uranium Project.
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Zabev, B., A.C.A. Howe for Anaconda Uranium Corp. (1997). Geological Report on the Copper Mountain Uranium Project Wyoming, U.S.A.
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Carter, G.S. for Neutron Energy (2008). The Copper Mountain Project. Technical Report by Broad Oak Associates.
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Davis, J.F. and Wilton, D.T for Neutron Energy Inc. (2010). The Copper Mountain, Wyoming Project Resource Status, Potential & Recommended Programs.
The historic resources referred to here were estimated on the basis of over 900,000 feet of hammer tool and core drilling. The data collection methods applied at the time are considered appropriate and reliable and the estimates derived from them are considered relevant. However, the resultant gamma logs and core assays that supported metallurgical test results, process design studies, reserve calculations, engineering and feasibility studies, and environmental studies and baseline permitting data were not available to the Qualified Person, therefore a complete and thorough review of the data has not been possible. Rocky Mountain Energy Corp. used the polygonal estimation method based on ten-foot composite thicknesses and 0.010% U 0 cut off using gamma probe grades with a tonnage factor 12 cubic ft/ton. These estimates are not current under NI 43-101 and the reader is cautioned that historical resource estimates should not be relied upon to judge the quality of exploration potential of Copper Mountain. The “most likely mineable reserves” estimated by RMEC as presented in the reports would be categorized as Indicated and Inferred resources, in accordance with definitions of the CIM Definition Standards for Mineral Resources & Mineral Reserves (2014). The portions of the “reserves” (approximately 20 to 60%) that were drilled on a 15 to 30 metre (50 to 100 foot) centers, and normally would be classified as Measured resources, are equated to Indicated resources, because of the nature of the mineralization, uncertainty regarding the grades and the lack of established economic viability of the deposits at the time. The remaining portions of the “reserves” drilled on 30 to 60 metre (100 to 200 foot) centers, are classified as Inferred resources. An attempt to separate the indicated from the inferred resources was not possible from the available information. Note that mineral resources that are not mineral reserves do not have demonstrated economic viability. Estimates of target and district potential, although based on assumptions with technical merit, are speculative in nature and should be relied upon as an indication of future resources or reserves.
A qualified person has not done sufficient work to classify the historical estimate as current mineral resources or mineral reserves; and the issuer is not treating the historical estimate as current mineral resources or mineral reserves. Inherent limitations of the historical estimates include that the nature of the mineralisation (fracture hosted) makes estimation from drill data less reliable than other deposit types (e.g. those that are thick and uniform). From Myriad’s viewpoint, limitations include that the Company has not been able to verify the data itself and that the estimate may be optimistic relative to subsequent work which applied a “delayed fission neutron” (DFN) factor to calculate grades. On the other hand, DFN is controversial, in that the approach is viewed by some experts as too conservative. Nevertheless, it was applied in later resource estimations by Union Pacific relating to Copper Mountain. In order to verify the historical estimates and potentially re-state them as current resources, a program of digitization of available data is required. This must be followed by re-logging and/or re-drilling to generate new data to the extent necessary that it is comparable with the original data, or new data that can be used to establish the correlation and continuity of geology and grades between boreholes with sufficient confidence to estimate mineral resources.
NOTES TO DISCLOSURE OF EXPLORATION RESULTS
Copper Mountain, Wyoming
Myriad’s 2024 Drilling
Drilling was undertaken by Harris Exploration using two diamond core (DD) rigs producing HQ (63.5 mm / 2.5 in) core diameter and 96 mm (3.78 in) in hole diameter, and one reverse circulation (RC) rig using a 140 mm (5.5 in) hammer bit. Core samples were packed into core trays and transported to Riverton for further processing. RC hole runs were drilled at 5 ft intervals and split on site by a rig-mounted cyclone splitter to produce two representative samples that were then transported to Riverton for further processing.
Downhole Logging
Downhole logging was performed by DGI Geoscience (DGI) using a combination of Spectral Gamma Ray (SGR) probe for gamma data, and Optical Televiewer and/or Acoustic Televiewer for structural data. The probes are manufactured by Mount Sopris Instruments with details as follows:
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QL40 SGR BGO (Sx): Measures the energy of gamma emissions from natural sources within formations crossed by a borehole. It counts the number of gamma emissions at each energy level aiding in lithological determination and correlation. The Probe use a Bismuth Germanium Oxide scintillation crystal.
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QL40 SGR 2G CeBr3 (Sx): Measures the energy of gamma emissions from natural sources within formations crossed by a borehole. It counts the number of gamma emissions at each energy level aiding in lithological determination and correlation. The probe uses a CeBr3 (Cerium Bromide) scintillation crystal.
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QL 40 ABI 2G (At, Gr): Captures high-resolution, oriented images of the borehole wall, allowing the orientation of acoustically visible features to be determined. This includes fractures, bedding/rock fabric, breakouts, bedding planes and other structural features. Contains a built in Natural Gamma sensor that measures the gamma emissions from natural sources in the formation.
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QL OBI 2G (Ot, Gr): Captures a high-resolution, oriented image of the borehole wall using a CMOS digital image sensor, allowing the orientation of features to be determined. This includes fractures, bedding/rock fabric, veins, lithological contacts, etc. Contains a built in Natural Gamma sensor that measures the gamma emissions from natural sources in the formation.
The spectral gamma probes measure the full energy spectrum of the gamma radiation emitted naturally from within the formations crossed by a borehole. A Full Spectrum Analysis (FSA) was performed on the recorded energy spectra. The FSA derived, in real time, the concentration of the three main radioisotopes K, U, Th, and thus also provided insight into the mineral composition of the formations. DGI also ran optical and acoustic televiewer, when hole conditions allow, to obtain downhole structural information. Borehole paths are being measured using a gyroscopic deviation tool.
Initial manufacturer calibration certificates were provided to Myriad by DGI. Downhole gamma measurements were checked for a repeatability by comparing down and up runs in the borehole. DGI provided conversion of API units measured by the spectral gamma probes to eU O concentrations using a standard 3 8 conversion theory and formula.
Geological Logging, Sampling and Analysis
Description of geological features (lithology, structure and alteration) was undertaken prior to sampling according to standardized logging templates. Core sampling intervals were selected primarily on the basis of lithological changes and in conjunction with radiometric intervals identified from the downhole spectral gamma probe measurements (using a 100-ppm cut-off). Core sample lengths are limited to a maximum of 3 feet and adjusted to a minimum of 1 foot, where appropriate, to capture significant features in the core. Reverse Circulation samples were collected and split at the rig in 5-foot intervals, with samples being selected based on downhole spectral gamma probe measurements (using a 100-ppm cut-off).
Samples were prepared and analysed at Paragon Geochemical, located in Sparks, Nevada. Sample preparation involved inventory, weighing, drying at 100°C, crushing to 70% passing 10 mesh, riffle splitting 250 g and pulverizing to 85% passing 200 mesh. The requested sample analysis package for trace and ultra-trace level geochemistry was a Multi-Element Suite (48 elements) using a Multi- Acid digest with ICP-MS.
Quality Assurance and Quality Control
Quality Assurance was achieved by implementing a set of Standard Operating Procedures (SOP) for logging and sampling. Quality Control in sampling and analysis was achieved by insertion of Blanks, Standards (Certified Reference Materials) and laboratory split (Duplicates) at a minimum rate of 5% each. Inspection of QC data from the reported analyses shows adequate control of contamination and equipment calibration.
Radiometric Disequilibrium
Radiometric disequilibrium refers to the loss or gain of uranium and/or its daughter products (e.g. radon-222, bismuth-214 and radium-226) in the mineralised zone during geologic processes, which can disrupt the equilibrium between the parent isotope and the daughter products. Some historic reports state that closed can assays from Copper Mountain indicated little disequilibrium, however differences between gamma probe data and chemical assay were still observed. From the analysis data received, and comparison with the downhole spectral gamma probe data, it is apparent that disequilibrium has occurred within the Canning deposit. Individual grades are often higher, or lower, than those previously reported by the spectral gamma probe, implying that uranium, or its daughter products, have been mobile in the system since initial deposition. The average ratio of chemical assay intervals to spectral gamma probe assay intervals is ~1.2, indicating uranium content to be biased towards higher grades in the chemical assays, by as much as 20% on average. It is unclear at this stage if the disequilibrium observed results from radon interference or leaching and remobilisation of uranium or radium and other daughter products in the geological environment. Myriad will expand the physical sampling program to submit more samples to the laboratory to account for zones where higher uranium levels might be returned compared to low levels of spectral gamma measurement. Additional high resolution spectral analyses of samples will also be required to determine the specific cause of disequilibrium within the system.
Geological Background
Uranium mineralisation at Copper Mountain occurs in two distinct geologic environments:
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Fracture-controlled uranium mineralisation hosted in Archaean-aged granite, syenite, isolated occurrences along the margins of diabase dikes and in association with meta-sediment inclusions in granite; and
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As disseminations in coarse-grained sandstones and coatings on cobbles and boulders in the Tertiary-aged Teepee Trail Formation at the Arrowhead (Little Mo) mine and other localities.