Positive Metallurgical Test Results - Halleck Creek Project
19 Ottobre 2023 - 3:03PM
American Rare Earths
(ASX: ARR | ADRs - OTCQX: AMRRY |
Common Shares - OTCQB: ARRNF| FSE:1BHA) (ARR or the
Company) announces results from its metallurgical testing
program from its flagship Halleck Creek project in Wyoming,
performed under the direction of Wood PLC.
Highlights
- Recoveries of Neodymium and Praseodymium Oxide (NdPrO)
increased 28.5% from prior designs.
- This preliminary test work indicates the ore can be effectively
processed using conventional technologies that not only require
less initial capital expenditure but also provides lower ongoing
operating costs.
- Block flow diagrams are now complete and will be utilized in a
subsequent phase of metallurgical test work to finalize a flowsheet
to be used in a forthcoming Preliminary Economic
Analysis.
ARR continues to advance the Halleck Creek project as
potentially the largest strategic rare earth project in the United
States, with a previously announced 1.43 billion tonne JORC
resource2. The mineralization in this deposit is allanite and
testing shows that rare earth elements can be leached from allanite
utilizing atmospheric acid tank leaching, whereas rare earth
elements cannot be leached from monazite or bastnaesite deposits
utilizing the same leaching process. In the most recent tests,
sulphation baking kilns were removed from updated flowsheet design
in favour of acid tank leaching. Acid tank leaching requires much
lower operating temperatures and provides lower capital and
operating costs than thermal cracking operations. Furthermore, the
main reagents utilized are in plentiful supply in the Western U.S.
and the project is proximate to interstate highway and railroad
transportation.
“We are encouraged by the results of our most recent
metallurgical tests provided by Wood PLC because they indicate that
the properties of the Halleck Creek deposit may allow us to extract
greater recoveries of magnet metals using simpler, lower-cost
technology,” said Donald Swartz, Chief Executive Officer of
American Rare Earths.
Initial results indicate increased recoveries of targeted rare
earth materials (82-87% of the NdPr) using conventional processing
technologies. Furthermore, ARR’s current exploration program is
nearing completion. The core material obtained from the ongoing
program is being prepared and will be sent to labs for the next
phase of detailed metallurgical testing.
Technical Summary
- NdPr represents a favorable 23% of the Total Rare Earth Oxides
(TREO) grade in the resource.
- The coarse grain structure offers relatively low energy costs,
allowing sequential grinding and beneficiation to reject 83.9% of
feed mass.
- The ore exhibits favorable selectivity for magnetic separation
utilizing Wet High Intensity Magnetic Separator (WHIMS) magnetics
at a grind size of 80% passing 106 microns, and the concentrated
ore has a TREO grade of 1.51%, illustrating an impressive upgrade
ratio of 4.3:1 using WHIMS processing alone.
- Preliminary acid tank leach testing adopted 6 hours of
residence time at 90 deg C with 250 kg/t sulfuric acid addition,
extracted 82-87% of the NdPr from feed material. Future work will
continue to optimize the design and increase recoveries.
- The use of flotation does not significantly improve the upgrade
ratio. Therefore, flotation will not be included in flowsheet
design, further reducing potential capital and operating
costs.
CEO, Donald Swartz, commented further, “Acid tank leaching is a
well-established mineral processing technology with little
technical risk and offers the ability to process high volumes of
concentrate in low-cost leach trains at below-boiling point,
compared to the constraints of acid-baking kilns that are limited
to feed solids and are expensive to build and operate.”
This market announcement has been authorized for release to the
market by the CEO of American Rare Earths.
Competent Persons
Statement: The information in this document is based
on information compiled by Mr. Greg Henderson. Mr. Henderson is a
Senior Process Consultant at Wood Australia. Mr. Henderson is a
Fellow of the Australian Institute of Mining and Metallurgy
(AUSIMM), number 109007, and has sufficient experience which is
relevant to the style of mineralization and type of deposit under
consideration and to the activity which he is undertaking to
qualify as a Competent Person as defined in the 2012 JORC Code. Mr.
Henderson consents to the inclusion in the report of the matters
based upon the information in the form and context in which it
appears. This work was reviewed and approved for release by Mr.
Dwight Kinnes (Society of Mining Engineers #4063295RM) who is
employed by American Rare Earths and has sufficient experience
which is relevant to the style of mineralization and type of
deposit under consideration and to the activity which he is
undertaking to qualify as a Competent Person as defined in the 2012
JORC Code. Mr. Kinnes consents to the inclusion in the report of
the matters based upon the information in the form and context in
which it appears.
About American Rare Earths
Limited: American Rare Earths (ASX: ARR | ADRs
- OTCQX: AMRRY | Common Shares - OTCQB: ARRNF| FSE:1BHA) owns the
Halleck Creek, WY and La Paz, AZ rare earth deposits which have the
potential to become the largest and most sustainable rare earth
projects in North America. American Rare Earths is developing
environmentally friendly and cost-effective extraction and
processing methods to meet the rapidly increasing demand for
resources essential to the clean energy transition and US national
security. The Company continues to evaluate other exploration
opportunities and is collaborating with US Government-supported
R&D to develop efficient processing and separation techniques
of rare earth elements to help ensure a renewable future.
See JORC Table
here
Head Office American Rare
Earths Ltd 1658 Cole Blvd, Suite G30 Lakewood, CO,
80401 info@americanree.com americanrareearths.com.au
Media ContactSusan Assadisassadi@americanree.com347 977 7125
- ASX announcement June 2, 2023
- ASX announcement March 30, 2023
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