Technical Study Routine +

US Copper Announces Positive Locked Cycle Test Results from Metallurgical Testwork at the Moonlight-Superior Copper Project

US Copper Corp validates metallurgy for its project, advancing toward a preliminary feasibility study while continuing a dilutive financing cycle.

By The Northwire Desk — AI Analysis Jun 17, 2026 · 08:01 USCU · 0.155 US Copper Corp.

Executive Summary

US Copper Corp announced positive locked cycle test results from metallurgical testwork at the Moonlight-Superior Copper Project.
Resource average master composite yielded a copper concentrate grading 24% Cu, 1.2 g/t Au, and 178 g/t Ag.
Achieved 91% copper, 74% gold, and 78% silver recovery, validating the recovery assumptions used in the Preliminary Economic Assessment (PEA).
Open circuit variability tests across 8 samples averaged 84% copper recovery at 24% Cu concentrate grade.
The optimized conventional flowsheet supports the company's timeline to finalize metallurgical testing and advance a Pre-Feasibility Study (PFS) over the next 12 months.
Impurities are low (SiO2 13%, Arsenic 0.27%, Mercury <1 ppm, MgO 0.40%), indicating a marketable concentrate.

Material Impact

The news is a routine positive update that confirms previously disclosed PEA metallurgical assumptions.
It does not introduce new economic data, revised resource estimates, or changed capital/operating cost guidance.
The primary impact is procedural: it clears a technical hurdle to initiate the PFS, which is a standard next step in project development.
Given the company's history of frequent small-cap dilutive financings at $0.10, this technical validation is expected and incremental rather than market-moving.
The stock price has already consolidated in the $0.15-$0.17 range, suggesting the market has priced in this development phase.

USCU · Price

Company Overview

US Copper Corp is focused on developing the Moonlight-Superior Copper Project in Plumas County, California.
The project consists of three surface-open deposits: Moonlight, Superior, and Engels.
The 2025 PEA outlines a 14-year life-of-mine operation producing an average of 60 million lbs of copper annually (1.8 billion lbs total).
Key PEA metrics include an initial capital cost of US$956 million, operating costs of US$7.77/short ton, and a post-tax IRR of 23% with a post-tax NPV(7%) of US$1.075 billion at $4.15/lb Cu.
The project aims to leverage existing regional infrastructure (highways, rail, power, water) to supply domestic U.S. copper demand.

More from US Copper Corp.