VANCOUVER, BC, Would possibly 15, 2025 /PRNewswire/ – Horizon Copper Corp. (TSXV: HCU) (OTCQX: HNCUF) (“Horizon Copper”, “Horizon”, or the “Company”) is happy to focus on the unedited analytical effects discharged by way of Entrée Assets Ltd. (“Entrée”) from drilling finished in 2022–2024 at the Hugo North Extension (“HNE”) on the Oyu Tolgoi mine in Mongolia.

The unedited drilling effects from the HNE vault have been just lately made to be had by way of Entrée’s three way partnership spouse Oyu Tolgoi LLC (“OTLLC”) and are a continuation from the prior to now introduced drilling effects reported by way of Entrée in February 2024 and February 2025. Those unedited effects come with one floor diamond drill hollow and 5 underground diamond drill holes finished all the way through 2024 at the Shivee Tolgoi mining licence, in addition to one underground drill hollow from the 2022 program. The outside drill hollow was once collared at the Entrée/Oyu Tolgoi Joint Challenge Quality (the “JV Property”) and the underground drill holes have been all collared from current infrastructure at the Oyu Tolgoi mining licence. Each and every of the six diamond drill holes with newly reported assay effects have been drilled at average dips towards the north or northeast, focused on mineralization inside the doable Elevate 2 cancel cave or branch instantly to the east. A number of drill holes reported on this contemporary drop and former information releases have persisted as much as 200 metres vertically underneath the bottom of the prospective Elevate 2 cancel cave and remained in robust copper and gold mineralization.

Erfan Kazemi, Horizon’s President & CEO, commented, “The drilling results at Hugo North Extension continue to be some of the most impressive seen on copper projects around the world and add to the growing list of remarkable assays that have been released over the last 12 months on the project. In particular, the latest results highlight the long-term potential at Hugo North Extension Lift 2. As Entrée’s largest shareholder, Horizon continues to be encouraged by the robust and long-life cash flows that this asset represents and the long-term value that our interest in Entrée will bring to Horizon shareholders.”

HNE Underground Drill Holes

• UGD871: 197 metres grading 1.07% copper and nil.38 grams in keeping with tonne (“g/t”) gold from 358 metres, together with 89 metres grading 1.33% copper and nil.44 g/t gold;
• UGD873A: 279 metres grading 1.12% copper and nil.16 g/t gold from 360 metres; and
• UGD876: 169.3 metres grading 2.72% copper and nil.82 g/t gold from 224.7 metres, together with 112 metres grading 3.33% copper and nil.81 g/t gold.

HNE Floor Drill Hollow

• UGD189B: 552 metres grading 2.30% copper and 1.45 g/t gold from 1,226 metres, together with 260 metres grading 3.29% copper and a pair of.08 g/t gold.

In April 2025, Rio Tinto Staff, the operator of Oyu Tolgoi, introduced that Elevate 1 underground mine ramp-up remainder heading in the right direction. The Elevate 1 underground mine plan accommodates the advance of 3 panels (Panels 0, 1, and a pair of) and the HNE vault at the JV Quality is situated within the northern portion of Panel 1. Underground building paintings for Panel 1 at the JV Quality started in October 2024, and as of April 30, 2025, OTLLC had finished roughly 152 metres of lateral building. In keeping with the tide building agenda, underground manufacturing at the JV Quality is anticipated in 2027.

For more info and entire drill effects, discuss with Entrée’s web site at www.entreeresourcesltd.com and the following the clicking drop dated Would possibly 14, 2025. Horizon Copper has publicity to the Hugo North Extension and Heruga vault of the Oyu Tolgoi copper mine thru its 24% fairness possession of Entrée.

Certified Individual

Imola Götz (M.Sc., P.Eng.) is a Certified Individual as outlined by way of Canadian Nationwide Software 43-101. Ms. Götz has reviewed and authorized the clinical and technical knowledge on this information drop.

About Horizon Copper

Horizon Copper is a premier copper corporate conserving a portfolio of extraordinary copper property together with a 1.66% web earnings hobby at the Antamina copper mine, publicity to the Oyu Tolgoi copper mine thru a 24% fairness possession in Entrée Assets Ltd., and a 30% hobby within the copper-gold Hod Maden venture. Horizon plans to actively develop its portfolio of property with a focal point on copper initiatives.

Cautionary Word Relating to Ahead-Having a look Data

This press drop incorporates forward-looking knowledge inside the which means of Canadian securities rules. Even supposing Horizon believes that such knowledge is cheap, it may give deny oath that such expectancies will end up to be proper. Ahead-looking knowledge is in most cases known by way of phrases comparable to: “believe”, “expect”, “anticipate”, “intend”, “estimate”, “postulate” and homogeneous expressions, or are the ones, which, by way of their nature, the following occasion occasions. The Corporate cautions buyers that any forward-looking knowledge supplied by way of Horizon isn’t a oath of occasion effects or efficiency and that unedited effects might vary materially from the ones in forward-looking knowledge on account of diverse elements, together with, however now not restricted to, the predicted capital expenditures, together with exploration and building process; the occasion value and insist of gold, copper, and alternative metals. The forward-looking statements contained on this press drop are made as of the moment of this press drop. Horizon disclaims any goal or legal responsibility to replace or revise any forward-looking statements, whether or not on account of fresh knowledge, occasion occasions or differently, apart from as required by way of legislation. The securities referred to on this press drop have now not been, nor will they be, registered beneath the USA Securities Work of 1933, as amended, and will not be presented or bought inside the USA or to, or for the account or advantage of, U.S. individuals absent U.S. registration or an acceptable exemption from the U.S. registration necessities. The Corporate assumes deny legal responsibility to replace forward-looking statements apart from as required beneath securities rules. Additional knowledge regarding dangers, guesses and uncertainties related to those forward-looking statements and our industry will also be present in Horizon’s Annual Data Mode for the occasion ended December 31, 2024, filed beneath the Corporate’s profile on SEDAR+ (www.sedarplus.ca), in addition to next filings that may also be discovered beneath the Corporate’s profile.

Neither the TSX Challenge Trade nor its Law Services and products Supplier (as that time period is outlined within the insurance policies of the TSX Challenge Trade) accepts accountability for the adequacy or accuracy of this drop.

SOURCE Horizon Copper Corp.