Toronto, Ontario--(Newsfile Corp. - May 9, 2024) - York Harbour Metals Inc. (TSXV: YORK) (OTCQB: YORKF) (FSE: 5DE) (the "Company" or "York") is pleased to announce positive results from its Mineral Liberation Analysis - Scanning Electron Microprobe ("MLA-SEM") analysis of samples from its Bottom Brook Rare Earth Elements ("REE") project in Newfoundland and Labrador.

Dr. Derek H.C. Wilton, PhD., P.Geo, FGC (a Fellow of Geoscientists Canada), of Terra Rosetta Inc., was commissioned by York Harbour Metals to collect samples from the Botton Brook REE project and perform MLA-SEM analysis to identify the mineralogy of the REE-bearing minerals. A total of 13 grab samples were collected and processed into thin sections before analysis at the Memorial University of Newfoundland and Labrador Core Research Equipment & Instrument Training Network ("CREAIT") MLA-SEM laboratory. Note: The lab, while not accredited, is a respected research facility at Memorial University. These samples, though not representative of the overall mineralization of the project, provide key insights into the discovered mineralization and its potential for concentration using standard techniques.

Highlights of the Botton Brook REE Terra Rosetta Inc. Report Include:

• Field sample G4 returned a very high 35.98 % Area Total REE as mapped in thin section by MLA-SEM.

• Monazite, the primary REE-bearing mineral in the Bottom Brook showings, is known for its amenability to well-established metallurgical processing methods.

• Thorite, commonly intergrown with monazite, suggests that radiometric geophysical surveys could be effective in exploring for this mineralization.

• Dr. Wilton noted that the Bottom Brook REE mineralization closely resembles the Steenkampskraal monazite deposit in South Africa (Basson et al., 2016; and Harlov et al., 2020).

Table 1. Total REE and Monazite contents (area %) in Bottom Brook samples as mapped by MLA-SEM

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The table lists the samples in order of Total REE mineral and monazite contents. Total REE minerals include the abundances of monazite ((Ce,La,Nd,Th)PO4), bastnasite ((La, Ce)CO3F), britholite ((Ce,Ca)5(SiO4)3OH), and secondary REE minerals. These secondary minerals are minor phases identified by MLA, containing REE with compositions too complex for precise identification.

Samples were analysed using an FEI Quanta 400 environmental SEM equipped with a Bruker XFlash EDX Detector at the CREAIT labs, Memorial University. The SEM electron gun uses a W filament at an operating voltage of 25 kV and a beam current of 10 nA. The working distance between sample and detector is 12 mm. The MLA software enables quantitative evaluation of the abundance, association, size, and shape of minerals in an automated, systematic fashion. In other words, the MLA allows for the quantitative mapping of mineral phases in individual grain mounts, essentially providing a digital point count of mineral species.