Pacific Ridge Announces Initial Mineral Resource Estimate for Kliyul Copper-Gold Project

Executive Summary

• Pacific Ridge announced its initial NI 43‑101 compliant mineral resource estimate for the Kliyul Main Zone (KMZ), reporting an inferred resource of 334.1 Mt at 0.33% CuEq (≈2.42 million lb CuEq).
• The KMZ resource contains 1.11 M lb copper, 2.74 Moz gold, and 10.22 Moz silver in the inferred category, positioning Pacific Ridge among a select group of B.C. copper‑gold explorers with a significant resource.
• The company outlined next steps: filing an NI 43‑101 technical report within 45 days, continued infill and expansion drilling, and metallurgical test work.

Key Details

• Resource Summary (0.20% CuEq cutoff):
• Tonnes: 334,100,000
• CuEq %: 0.33
• Cu %: 0.15
• Au: 0.26 g/t
• Ag: 0.95 g/t
• CuEq (Mlb): 2,422
• Copper (Mlb): 1,110
• Gold (Oz): 2,740,000

• Silver (Oz): 10,220,000

• Higher‑grade cutoff (0.25% CuEq) shows: 239 Mt at 0.37% CuEq, 1.95 M lb CuEq, 861 k oz Au, 7.98 M oz Ag.

• Effective date of estimate: July 31 2025.

• Methodology & Assumptions:

• CIM definitions for mineral resources; inferred blocks required ≥1 drill hole within 150 m.
• Block model: 20 × 20 × 20 m, ordinary kriging interpolation, minimum two‑hole composites per block.
• Metal recoveries assumed: Cu 80%, Au 65%, Ag 65% (based on Mount Milligan data).

• Economic parameters used for pit‑shell constraint: Cu US$4.60/lb, Au US$2,600/oz, Ag US$30/oz; mining C$3.5/t, processing C$7.0/t, G&A C$3.0/t; exchange rate 1.30 CAD/USD; pit slope 45°.

• Resource Geometry:

• Pit‑shell model shown at 0.20% CuEq cutoff (Figure 3).

• Resource remains open to the north, west, east, southeast, and at depth.

• Historical Drilling Highlights (2021‑2024):

• Best intercepts: 316.7 m @ 0.79% CuEq (2021), 328.0 m @ 0.64% CuEq (2022), 305.5 m @ 0.59% CuEq (2023), 45 m @ 0.58% CuEq (2024).

• Drill hole KLI‑23‑069 delivered deepest mineralized interval to date (584 m depth).

• Future Work:

• File NI 43‑101 Technical Report within 45 days.
• Conduct infill and resource expansion drilling at KMZ; test other Kliyul targets.

• Initiate metallurgical testing.

• Qualified Persons:

• Resource estimate prepared by Susan Lomas, P.Geo., Lions Gate Geological Consulting Inc.; reviewed by Bruce Davis, PhD, FAusIMM.
• Independent QP review and audit performed by LGGC.

Notable Quotes

“The initial mineral resource estimate for KMZ is an important milestone for the Company and its shareholders,” said Blaine Monaghan, President & CEO. “We now belong to a select group of B.C. copper exploration and development companies that have a significant mineral resource.”