<p>Vancouver, British Columbia--(Newsfile Corp. - June 18, 2026) - <b>Cosa Resources Corp. (TSXV:<a ...

COSAF

Cosa Commences Largest Drill Program to Date at the Murphy Lake North Uranium Joint Venture with Denison Mines

Cosa launches largest-ever Murphy Lake North drill program with Denison

<section class="insight" data-version="1">
  <section data-block="information">
    <h3>Information</h3>
    <p>&lt;p&gt;Vancouver, British Columbia--(Newsfile Corp. - June 18, 2026) - &lt;b&gt;Cosa Resources Corp. (TSXV:&lt;a ...</p>
  </section>

  <section data-block="ai-summary-paragraph">
    <h3>AI Summary</h3>
    <p>Cosa Resources launches its largest-ever drill program at Murphy Lake North (MLN), a 70% COSA / 30% Denison JV. The ~6,000-metre campaign targets extensions of winter Cyclone mineralization near IsoEnergy&#039;s Hurricane deposit, with Denison funding to sustain its stake. Positive results could unlock near-term resource potential and provide upside for COSAF investors.</p>
  </section>

  <section data-block="ai-summary-bullets">
    <h3>Key Points</h3>
    <ul><li>Cosa starts Murphy Lake North drilling with Denison; 6,000 m in 15 holes.</li><li>Cosa holds 70%; Denison funds 30% and remains partner.</li><li>Drilling targets extensions of Cyclone mineralization near Hurricane deposit.</li><li>Program is largest in Cosa&#039;s history, focusing on open strike zones and targets.</li></ul>
  </section>

  <section data-block="companies-mentioned">
    <h3>Companies Mentioned</h3>
    <ul><li><strong>Cosa Resources Corp. (COSAF)</strong>: Operator of MLN; 70% equity; largest drill program in company history; potential to expand uranium resource base.</li><li><strong>Denison Mines Corp. (DML)</strong>: JV partner; funds 2026 exploration to maintain 30% stake; strategic collaboration with COSA.</li><li><strong>IsoEnergy Ltd. (IXE)</strong>: Adjacent to MLN via Hurricane deposit; Cyclone trend aligns with IsoEnergy&#039;s Athabasca projects; potential coattail effects.</li></ul>
  </section>

  <section data-block="category">
    <h3>Corporate Developments</h3>
    <p>Category: Corporate Developments. Fits as a strategic exploration update and JV funding news, signaling potential value creation from resource discovery and partnership dynamics in uranium plays.</p>
  </section>

  <section data-block="market-moving">
    <h3>Market-Moving</h3>
    <ul><li>Murphy Lake North&#039;s 6,000 m campaign could unlock resource potential.</li><li>Denison funds 30% of exploration, reinforcing JV stability.</li><li>Cyclone-Hurricane corridor exposure may attract uranium stock momentum.</li><li>Summer 2026 results likely drive near-term COSAF price reaction.</li></ul>
  </section>

  <section data-block="key-facts">
    <h3>Key Facts</h3>
    <ul><li>MLN is a joint venture: COSA 70%, Denison 30%; Denison funds 2026 exploration.</li><li>Drilling: approximately 6,000 metres in 15 holes planned for Summer 2026.</li><li>Location: MLN lies 3 kilometres east of IsoEnergy&#039;s Hurricane deposit; Cyclone trend.</li><li>Winter 2026 results indicated uranium mineralization in the Cyclone trend; follow-up targets defined.</li><li>Summer targets include testing major faults and alteration zones open at the unconformity.</li></ul>
  </section>

  <section data-block="trading-thesis">
    <h3>Trading Thesis</h3>
    <p>COSAF could rally on MLN results over 6–12 months if assays confirm uranium mineralization.</p>
  </section>
</section>


<article>
  <section>
    <h2>Overview of Murphy Lake North Drilling Program Launch</h2>
    <p>Vancouver, British Columbia-based Cosa Resources Corp. (TSXV: <strong>COSA</strong>) (OTCQB: <strong>COSAF</strong>) (FSE: SSKU) announces that drilling has commenced at the Murphy Lake North ("MLN") uranium project. MLN is a joint venture between <strong>Cosa</strong> and Denison Mines Corp. (TSX: DML; NYSE: DNN) and is located three kilometres east of IsoEnergy's Hurricane deposit. Cosa is the project operator and holds a <strong>70%</strong> interest, with Denison owning the remaining <strong>30%</strong>.</p>
    <p>This marks the start of Cosa Resources’ largest drill program to date and underscores the company’s active strategy in uranium exploration. The program is designed to follow up on uranium mineralization identified in the winter program and to expand known zones of mineralization at MLN.</p>
  </section>

  <section>
    <h2>Program Highlights</h2>
    <ul>
      <li>Drilling will evaluate potential extensions of the Cyclone uranium mineralization intersected during <a href="https://api.newsfilecorp.com/redirect/xEnkytV81v">the winter program</a>, which is open along strike for <strong>600 metres</strong> in both directions and located only <strong>265 metres below surface</strong>.</li>
      <li>Drilling to comprise approximately <strong>6,000 metres</strong> in <strong>15 drill holes</strong> and represents the <em>largest drill program in the history of the Company</em>.</li>
      <li>Denison participating in funding <strong>2026 exploration at MLN</strong> to maintain its <strong>30%</strong> interest.</li>
    </ul>
  </section>

  <section>
    <h2>Executive Commentary</h2>
    <p>Keith Bodnarchuk, President and CEO, commented: "<i>We have officially kicked off our largest and most exciting drill program in Cosa's history, with a strong inventory of drill targets designed to follow up on uranium mineralization intersected during the winter drill program. We thank our Joint Venture partner and largest shareholder, Denison Mines, for their continued support and encouragement. I would also like to wish Andy Carmichael and the entire complement of Cosa's dedicated staff and contractors a safe and successful drill program, and we eagerly await the opportunity to update the market on this summers' progress</i>.<i>\"</i></p>
  </section>

  <section>
    <h2>Summer Drilling Plan at Murphy Lake North</h2>
    <p>Summer drilling at Murphy Lake North is expected to comprise approximately <strong>15 drill holes</strong> totaling <strong>6,000 metres</strong>. Drilling will focus on following up uranium mineralization intersected during winter 2026 which is open along strike for <strong>600 metres</strong> in both directions. Drilling on section 3200E (Figure 2) will target major faults with alteration which remain untested at the unconformity, including the area south of mineralized drill hole MLN26-016 where mineralization is open for 40 metres to the south (Table 1, Figure 3). Drilling on 3200E will be followed by progressive step outs along strike as warranted. Additional compelling drill targets have been generated <strong>600 metres to the east</strong> and <strong>600 metres to the west</strong> by reinterpreting summer 2025 drilling results in the context of the winter 2026 results.</p>
  </section>

  <section>
    <h2>Table 1 – MLN Winter 2026 Assay Results</h2>
    <table>
      <thead>
        <tr>
          <th>Hole</th>
          <th>ID</th>
          <th>From (m)</th>
          <th>To (m)</th>
          <th>Length (m)</th>
          <th>Radioactivity (CPS)</th>
          <th>U3O8 %</th>
          <th>Ni %</th>
          <th>Co %</th>
          <th>Orientation (Azi./Dip)</th>
          <th>Location</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>MLN26-013</td>
          <td>306.5</td>
          <td>307.0</td>
          <td>0.5</td>
          <td>&gt;350</td>
          <td>0.02</td>
          <td>0.09</td>
          <td>0.02</td>
          <td>166<sup>o</sup> / -60<sup>o</sup></td>
          <td>Section 3200E</td>
        </tr>
        <tr>
          <td>and</td>
          <td>307.5</td>
          <td>308.0</td>
          <td>0.5</td>
          <td>&gt;1,000</td>
          <td>0.25</td>
          <td>0.26</td>
          <td>0.04</td>
          <td>&nbsp;</td>
          <td>Section 3200E</td>
        </tr>
        <tr>
          <td>and</td>
          <td>308.5</td>
          <td>313.5</td>
          <td>5.0</td>
          <td>&gt;1,000</td>
          <td>0.55</td>
          <td>4.09</td>
          <td>1.73</td>
          <td>&nbsp;</td>
          <td>&nbsp;</td>
          <td>Section 3200E</td>
        </tr>
      </tbody>
    </table>
  </section>

  <section>
    <h2>Background on Murphy Lake North Joint Venture</h2>
    <p>The Murphy Lake North project is a uranium exploration venture that sits three kilometres east of IsoEnergy's Hurricane deposit. Cosa Resources Corp. serves as the project operator and holds a 70% interest, with Denison Mines Corp. owning the remaining 30%. The joint venture structure aligns with COSAF's strategic focus on advancing high-potential uranium targets in the region.</p>
  </section>

  <section>
    <h2>About the Company and Stock Symbol</h2>
    <p>For investors following COSAF, Cosa Resources Corp. trades under the symbol <strong>COSAF</strong> on OTC markets and maintains listing details on its primary exchange under TSXV: COSA. This press release reflects ongoing activity in the company’s exploration program and its commitment to advancing uranium discoveries.</p>
  </section>
</article>

Cosa Resources launches its largest-ever drill program at Murphy Lake North (MLN), a 70% COSA / 30% Denison JV. The ~6,000-metre campaign targets extensions of winter Cyclone mineralization near IsoEnergy's Hurricane deposit, with Denison funding to sustain its stake. Positive results could unlock near-term resource potential and provide upside for COSAF investors.

Cosa Commences Largest Drill Program to Date at the Murphy Lake North Uranium Joint Venture with Denison Mines

AI Summary

Sentiment Rationale

Trading Thesis

Market-Moving

Key Facts

Companies Mentioned

Corporate Developments

Related News