Lemhi Pass

Land Position:
+
acres

Project Stage:

Exploration

Location:

Idaho

Overview

Idaho Strategic’s Lemhi Pass project covers approximately 11,425 acres and is comprised of a mixture of unpatented lode mining claims, a State of Idaho mineral lease, and a mineral claim lease with a private company. The Company's Lemhi Pass land package is IDR's southern-most rare earth elements project within Idaho's Rare Earth Element Belt and it is strategically located approximately 35 miles south of the company’s Diamond Creek and Mineral Hill projects and 124 miles north of Idaho National Laboratory. IDR has completed a number of sampling programs across its Lemhi Pass property package and has received rare earth elements grades far exceeding the historically reported findings.

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Mineralization

Idaho Strategic initially staked its Lemhi Pass Project to target an area with the greatest concentration of known veins where the Lemhi Pass, Dan Patch, and Bull Moose faults intersect or approach one another. The rare earth elements mineralization at Lemhi Pass has primarily been found in phosphate minerals such as monazite and xenotime. To date, Idaho Strategic has conducted geologic mapping, surface sampling programs, and a modest trenching program. Select results showing increased levels of rare earth mineralization (up to 6% TREO) have revealed a unique distribution of rare earths showing a relatively high level of magnet REEs, including neodymium, praseodymium, dysprosium, terbium, and samarium - which collectively account for more than 50% of the total rare earth elements grade on average. According to Virginia Gillerman of the Idaho Geological Survey, “The Lemhi Pass ores are unusual in that they consistently show a strong enrichment in the middle rare earths, especially neodymium. Electron microprobe analyses of monazite reveal as much as 35 weight percent Nd oxide, which is possibly the highest content known in the world.” –Gillerman, V.S., 2011, Idaho GeoNote 44: Rare Earth Elements and Other Critical Metals in Idaho

REE Distribution

%
Magnet REEs
%
SEG
%
Yttrium
%
Nd
%
Sm
%
Pr
%
Eu
%
Dy
%
Gd
%
Tb
%
Y

*Results above are an average of 25 select samples, up to 6.19% TREO, taken at various locations across Lemhi Pass

Trenching

Sparky Prospect

Sample Ce Dy Er Eu Gd Ho La Lu Nd Pr Sm Tb Tm Yb Y Sc ppm TREO %
98366 7210 656 151 750 1770 83 1340 7 8770 1505 3110 178 13.7 1695 59 48 27,345 3.23%
98367 11650 392 54.2 731 1545 39.5 2410 2 11600 2210 3280 130 3.95 646 14.1 5 34,712 4.12%
98368 15650 380 80.4 583 1240 45.4 2100 4 9040 1770 2710 112 7.42 900 32.6 74 34,729 4.15%
98369 19000 496 70.2 928 1955 49.5 4540 2 16400 3260 4240 163.5 5.1 835 17.8 8 51,970 6.19%

 

In-Trust Prospect

Sample Ce Dy Er Eu Gd Ho La Lu Nd Pr Sm Tb Tm Yb Y Sc  ppm TREO %
98336 3200 128 50 238 366 21 445 5 10200 1420 1450 27 6 36 647 28 18,267 2.16%
98341 3330 194 83 254 437 34 479 7 10050 1415 1515 38 10 56 1045 24 18,971 2.25%
98344 3350 176 74 244 398 30 511 7 9890 1430 1445 34 9 52 939 27 18,616 2.21%
98345 2020 145 64 162 295 26 328 6 6030 840 963 26 8 47 805 30 11,795 1.40%
98350 3510 50 14 183 239 7 305 1 10050 1440 1375 14 2 10 175 26 17,401 2.06%
98351 2590 31 11 116 139 5 159 2 7450 1080 894 8 2 10 137 47 12,681 1.50%
98352 5800 113 38 361 519 16 433 4 19400 2700 2790 30 5 31 499 59 32,798 3.88%
98353 5000 94 32 331 512 13 365 4 15800 2240 2400 28 4 25 414 55 27,317 3.23%

 

Sampling
Screenshot 2025-05-03 at 9.26.40 AM

Idaho Rare Earth Belt

The Idaho Rare Earth Belt stretches along a northwest trending zone measuring approximately 70 miles long by 8 miles wide. This belt possesses most of the REE lode occurrences in Idaho. Along this 70-mile Belt, IDR controls the Mineral Hill Property in the northwest, the Diamond Creek Property in the middle; and its greatly expanded Lemhi Pass Property in the southeast.

2025 Exploration Plans

Screenshot 2025-05-20 at 2.34.42 PM

The plan at Lemhi Pass is to collect soil samples on a soil grid pattern over known and prospective areas of rare earth elements mineralization. Additionally, Idaho Strategic will conduct a handheld radiometric survey, for maximum accuracy and ground penetration, over the entirety of the company's Lemhi Pass claim holdings. The combination of soil sampling and radiometrics will allow for potential discovery of unknown rare earth element occurrences and more accurate drill planning.

High priory areas for exploration during 2025 are highlighted on the claim map to the left. These areas have been identified by Idaho Strategic geologists to contain known rare earth elements mineralization which will serve as a reference point to compare to areas previously not visited by the company that are going to be covered by the planned soil sampling and radiometric survey in 2025.

Contact Idaho Strategic Resources

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