Marban Gold Mine Project

O3 Mining Inc. is proposing the construction and operation of a new open-pit gold mine located in the Dubuisson Sector of Val-d'Or, in Quebec. As proposed, the Marban Mining Project would include the mining of three open pits, the construction of a new ore processing plant, new waste rock, tailings and overburden stockpiles, the relocation of an existing road and the diversion of a permanent watercourse. The project would have a maximum ore production capacity of 16,400 tonnes per day and a 10-year life span.

Latest update

February 8, 2023 — The Impact Assessment Agency of Canada has suspended the timeline for the impact assessment at the request (in French only) of the proponent.

January 20, 2023 — The Impact Assessment Agency of Canada issued the Summary of Issues to the proponent on January 6, 2023, for the preparation of the Detailed Project Description and Response to the Summary of Issues.

At a glance

1. Planning

Time limit suspension

February 8, 2023 — The time limit for the assessment has been suspended.

1. Planning

In progress 67/180 days

Key documents

Comment periods

2. Impact Statement

2. Impact Statement

Not started 0/1095 days
3. Impact Assessment

3. Impact Assessment

Not started 0/300 days
4. Decision Making

4. Decision Making

Not started 0/30 days
5. Post Decision

Post Decision phase is an ongoing process

The project is expected to begin as federal authorizations are issued and other compliance requirements are met.

5. Post Decision

Not started



Marban Mining Project
Impact Assessment Agency of Canada
901-1550, Estimauville Avenue
Québec, Quebec G1J 0C1
Telephone: 418-649-6444

  • Location

    • Val-d'Or (Quebec)
  • Nature of Activity

    • Mines and Minerals
  • Assessment Status

  • Start Date

  • Proponent

    O3 Mining Inc.
  • Authorities

    • Impact Assessment Agency of Canada
  • Assessment Type

    Planning Phase for Impact Assessment
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.

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