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HWG.CN ·

Headwater Gold and OceanaGold Sign Definitive Agreement to Explore Three Projects in Nevada

Mergers & Acquisitions

Suite 1210 – 1130 West Pender Street

Vancouver, British Columbia, Canada, V6E 4A4

T +1 (604) 681-9100

[email protected]

_____________________________________________________________________________________

Headwater Gold and OceanaGold Sign Definitive Agreement to Explore

Three Projects in Nevada

Vancouver, British Columbia, October 15, 2025: Headwater Gold Inc. (CSE: HWG, OTCQB:

HWAUF) (the "Company" or "Headwater") is pleased to announce that it has entered into a

definitive agreement (the “Agreement”) with a subsidiary of OceanaGold Corporation

(“OceanaGold”) (TSX: OGC, OTCQX: OCANF) for OceanaGold to acquire an option to earn up

to a 75% interest in Headwater’s TJ, Jake Creek and Hot Creek projects in Nevada (collectively,

the “Projects”) through staged exploration expenditures totalling up to US$ 65,000,000 and the

completion of Pre-Feasibility Studies.

Highlights:

• Firm commitment of US$2,500,000 : OceanaGold to fund a minimum commitment of

US$2,500,000 in exploration expenditures across three Projects within the first two years

of the Agreement;

• Up to US$65,000,000 in staged earn -in expenditures: OceanaGold may elect to earn

up to a 65% interest in each Project by funding exploration expenditures of

US$25,000,000 on each of TJ and Jake Creek and US$15,000,000 on Hot Creek;

• OceanaGold may elect to earn an additional 10% by completing a PFS: By completing

a Pre-Feasibility Study (“PFS”) on each project OceanaGold may earn an additional 10%

in each Project (for a total of 75%) and granting Headwater a 1% NSR royalty upon

completion of the PFS;

• 10% Management Fee: Under the partnership, Headwater will be the initial operator of

the Projects and will receive a 10% management fee; and

• Commencement of drilling on the TJ project: Drill mobilization to the TJ project has

begun following the execution of the Agreement.

Caleb Stroup, Headwater’s President and CEO, states: “We are very excited to have

executed the Definitive Agreement with OceanaGold, a strong technical and financial

collaborator. The stage is now set for series of exploration programs on all three of these

projects in 2025. Mobilization for the TJ drilling program has commenced and we are

eagerly anticipating the kickoff of this high-priority drill test. TJ is interpreted to represent

a robust, fully preserved epithermal system with multiple high -quality targets identified

during our work last year and the partner -funded drilling this year is designed to unlock

the project’s full potential.”

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Table 1: Principal Structure of the Transactions:

Stage

Project Specific Expenditures (US$)

OceanaGold

Interest (%)

Maximum Time

for Each Stage TJ Jake Creek Hot Creek

Minimum

Commitment $1,000,000 $1,000,000 $500,000 0%

2 Years from

Execution Date

of Agreement

Stage 1 $10,000,000 $10,000,000 $5,000,000 51%

4 Years from

Execution Date

of Agreement

Stage 2 +$15,000,000 +$15,000,000 +$10,000,000 65%

4 Years from

commencement

of Stage 2

Stage 3

Completion of

PFS and 1%

NSR to HWG

Completion of

PFS and 1% NSR

to HWG

Completion of

PFS and 1% NSR

to HWG

75%

2 Years from

commencement

of Stage 3

Commercial Terms:

Headwater announced on July 22, 2025 that it had entered into a letter of intent (“LOI”) for the

transaction with OceanaGold. As consideration for entering into the LOI, OceanaGold advanced

a non-refundable payment of US$ 250,000 to Headwater that was used to fund pre -drilling

expenses on the Projects.

Upon execution of the Agreement (the “Execution Date”) , OceanaGold paid US$100,000 to

Headwater and an additional US$100,000 will be paid on the first anniversary of the Agreement

if OceanaGold elects to continue into the second year on at least one Project.

Earn-in Structure

Stage 1: OceanaGold may elect to earn a 51% interest in each Project by sole funding

expenditures of US$10,000,000 per Project for each of TJ and Jake Creek and US$5,000,000 for

Hot Creek within 48 months of the Execution Date. Stage 1 includes a firm commitment to fund

a minimum of US$1,000,000 in exploration expenditures on both TJ and Jake Creek and

US$500,000 at Hot Creek within the first two years.

Stage 2: OceanaGold may elect to earn an additional 14% interest (to 65%) in each Project by

sole funding additional expenditures of US$15,000,000 per Project for each of TJ and Jake Creek

and US$10,000,000 for Hot Creek within 48 months following the completion of Stage 1.

Stage 3: OceanaGold may earn an additional 10% interest (to 75%) in each Project by completing

a Pre-Feasibility Study for the respective Project and granting a 1% NSR royalty to Headwater,

within 24 months following completion of Stage 2.

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About the TJ Project:

The TJ project is located on Bureau of Land Management (“ BLM”) land in a relatively

underexplored area of northeastern Nevada, approximately 25 km southeast of the town of

Jackpot. The project area contains indications of a fully preserved epithermal system, including

a thick and laterally extensive accumulation of silica sinter in the core of the property. Epithermal

alteration is localized along a series of steeply inclined faults that bound a graben filled with

Miocene-age sedimentary rocks.

Limited historic exploration on the property included shallow Reverse Circulation (“ RC”) drilling

that confirmed the presence of a broad zone of high -level epithermal alteration. The Company

completed an initial round of scout drilling in 2024 which confirmed the project has potential for

high-grade epithermal vein-style mineralization at depth (Headwater news release - January 16,

2025). A follow-up core drilling program is being planned with the objective of testing prospective

epithermal structures identified during the 2024 program at depth.

The TJ project is subject to an underlying exploration lease and option to purchase agreement

under which the Company may acquire a 100% interest in the project for US$1,500,000 inclusive

of annual minimum payments. A portion of the project is subject to NSR royalties ranging from

1.5% to 2.5% with Headwater retaining the right to buy-down 80% of the NSR.

About the Jake Creek Project:

The Jake Creek project is 100% owned and consists of 189 unpatented lode mining claims on

BLM land in Humboldt County, Nevada, located 65 km northwest of Winnemucca and 8 km east

of the Nevada Gold Mines’ Turquoise Ridge Mine Complex. Historic drilling by Evolving Gold

Corp. in 2010 and 2011 (13 RC holes) intersected widespread epithermal mineralization at the

Tertiary unconformity, with notable intercept s1 such as 11.3 g/t Au over 1.52 m within 45.72 m

grading 0.96 g/t Au in hole JC -005. This mineralization, associated with silicification, clay

alteration and banded quartz veining, suggests a robust low -sulfidation epithermal system with

potential for high-grade feeder zones at depth or along strike. A portion of the project is subject

to a 1% NSR, half of which can be purchased for US$1,000,000 at any time. F or further

information see Headwater news release - March 3, 2025.

About the Hot Creek Project:

The Hot Creek project is 100% owned and royalty -free and consists of 52 unpatented mining

claims staked by Headwater in the Tuscarora District in Nevada. The project hosts a widespread

zone of silica flooding in Tertiary sediments in the immediate hanging wall of a silicified range

front fault. Historical shallow drilling 1 results include grades up to 1.04 g/t Au over 12.2 m and

0.34 g/t Au over 117.3 m along a range front fault. The majority of the historic drill holes at Hot

Creek were relatively shallow and did not adequately test for the presence of high-grade feeders

at depth along the range front fault or subsidiary structures. Future exploration at Hot Creek will

focus on refining the geological model, identifying new high -potential targets and conducting

additional geological mapping and surface sampling. For further information see Headwater news

release - September 4, 2024.

About OceanaGold:

OceanaGold Corporation (TSX: OGC, OTCQX: OCAN D) is a growing intermediate gold and

copper producer committed to safely and responsibly maximizing the generation of free cash flow

from its operations and delivering strong returns for its shareholders. OceanaGold has a portfolio

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of four operating mines: the Haile Gold Mine in the United States of America; Didipio Mine in the

Philippines; and the Macraes and Waihi operations in New Zealand. For more information, please

visit investors.oceanagold.com.

About Headwater Gold:

Headwater Gold Inc. (CSE: HWG, OTCQB: HWAUF) is a technically -driven mineral exploration

company focused on exploring for and discovering high -grade precious metal deposits in the

Western USA. Headwater is actively exploring one of the world’s most well -endowed, mining-

friendly jurisdictions, with a goal of making world-class precious metal discoveries. The Company

has a large portfolio of epithermal vein exploration projects and a technical team with diverse

experience in capital markets and major mining companies. Headwater is systematically drill -

testing several projects in Nevada and has strategic earn -in agreements with Newmont on its

Spring Peak and Lodestar projects. In August 2022 and September 2024, Newmont and Centerra

Gold Inc. acquired strategic equity interests in the Company, further strengthening Headwater’s

exploration capabilities.

Headwater is part of the NewQuest Capital Group which is a discovery -driven investment

enterprise that builds value through the incubation and financing of mineral projects and

companies. Further information about NewQuest can be found on its website at

www.nqcapitalgroup.com.

For more information about Headwater , please visit the Company's website at

www.headwatergold.com.

On Behalf of the Board of Directors

Caleb Stroup

President and CEO

+1 (775) 409-3197

[email protected]

For further information, please contact:

Brennan Zerb

Investor Relations Manager

+1 (778) 867-5016

[email protected]

Qualified Person

The technical information contained in this news release has been reviewed and approved by Dr.

Gregory Dering, P.Geo (AIPG CPG-12298), a “Qualified Person” (“QP”) as defined in National

Instrument 43-101 – Standards of Disclosure for Mineral Projects. Dr. Dering is not independent

by reason of being the Company’s Vice President of Exploration.

1Historical drill intercepts and surface samples cannot be relied upon and are treated by the

Company as historical in nature and not current or NI 43-101 compliant.

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Forward-Looking Statements:

This news release includes certain forward -looking statements and forward -looking information

(collectively, "forward-looking statements") within the meaning of applicable Canadian securities legislation.

All statements, other than statements of historical fact, included herein including, without limitation,

statements regarding future exploration expenditures by OceanaGold, anticipated content,

commencement, and cost of exploration programs in respect of the Company's projects and mineral

properties, and OceanaGold’s anticipated funding of the minimum commitment are forward -looking

statements. Although the Company believes that such statements are reasonable, it can give no assurance

that such expectations will prove to be correct. Often, but not always, forward looking information can be

identified by words such as "pro forma", "plans", "expects", "may", "should", "budget", "scheduled",

"estimates", "forecasts", "intends", "anticipates", "believes", "potential" or variations of such words including

negative variations thereof, and phrases that refer to certain act ions, events or results that may, could,

would, might or will occur or be taken or achieved. Forward-looking statements involve known and unknown

risks, uncertainties and other factors which may cause the actual results, performance or achievements of

the Company to differ materially from any future results, performance or achievements expressed or implied

by the forward-looking statements. Such risks and other factors include, among others, risks related to the

anticipated business plans and timing of futu re activities of the Company and OceanaGold, including the

Company's and OceanaGold’s exploration plans and the proposed expenditures for exploration work on

the Projects , the ability of OceanaGold to obtain sufficient financing to fund the proposed exploration

programs, delays in obtaining governmental and regulatory approvals (including of the Canadian Securities

Exchange) for the Agreement, the risk that OceanaGold will not elect to obtain any additional interest in the

Projects in excess of the minimum commitment, the ability of the Company to obtain the required permits,

changes in laws, regulations and policies affecting mining operations, the Company's limited operating

history, currency fluctuations, title disputes or claims, environmental issues and liabilities, as well as those

factors discussed in the Company's filings with the Canadian Securities Authorities, copies of which can be

found under the Company's profile on the SEDAR+ website at www.sedarplus.ca.

Readers are cautioned not to place undue reliance on forward -looking statements. The Company

undertakes no obligation to update any of the forward-looking statements, except as otherwise required by

law.