Mackenzie Valley Environmental Impact Review Board Publishes Draft Terms of Reference and Work Plan for the Gahcho Kué Project

    Shares Issued and Outstanding: 59,455,493
    TSX: MPV
    AMEX:   MDM

    TORONTO, and NEW YORK, June 6 /CNW/ - Mountain Province Diamonds Inc
("the Company") (MPV: TSX, MDM: AMEX) today announced that the Mackenzie
Valley Environmental Impact Review Board (MVEIRB) has published the draft
Terms of Reference for the Environmental Impact Study and draft Work Plan for
the Environmental Impact Review of the Gahcho Kué diamond project located in
Canada's Northwest Territories. Both documents can be accessed online at and the MVEIRB has called for comments from interested
parties by July 11, 2007.
    In terms of the draft Work Plan, the MVEIRB anticipates that the
Environmental Impact Review (EIR) of the Gahcho Kué project will be completed
by mid-2009. The MVEIRB stresses that the schedule for the EIR is subject to
change and will be updated as necessary and that all dates reported are
approximate target dates only.
    Mountain Province Diamonds President and CEO Patrick Evans commented:
"Following the publication of these two important documents, Mountain Province
will be meeting with representatives of the MVEIRB as well as the Gahcho Kué
project operator, De Beers Canada Inc, to review the draft terms of reference
and draft work plan and to assess the likely impact on the projects
development schedule". Mr. Evans added: "Shareholders are encouraged to
monitor the progress of the Environmental Impact Review of the Gahcho Kué
project through the public documents published online at"

    Located in Canada's Northwest Territories, Gahcho Kué is the largest new
diamond mine under development globally. The project consists of a cluster of
three primary kimberlites with an indicated resource of approximately 14.4
million tonnes grading at 1.64 carats per tonne (approximately 23.6 million
carats) and an inferred resource of approximately 17 million tonnes grading at
1.35 carats per tonne (approximately 22.9 million carats). Gahcho Kué is
currently in the permitting and advanced exploration stage of development. At
full production the Gahcho Kué diamond mine is expected to produce
approximately 3 million carats a year over 15 years.

    Mountain Province Diamonds (49 percent) is a joint venture partner with
De Beers Canada Inc (51 percent) in the Gahcho Kue project. De Beers is the
operator of the project and can be called on to fund the project through to
commercial production. If called on to fund a definitive feasibility study De
Beers has the right to increase its interest to 55 percent upon the completion
of a feasibility study. If called on to fully fund the mine's construction De
Beers will have the right to increase its interest to 60 percent following the
commencement of commercial production.

    Qualified Person
    This news release has been prepared under the supervision of Carl G.
Verley, P.Geo., who serves as the qualified person under National Instrument

    Forward-Looking Statements
    This news release may contain forward-looking statements, within the
meaning of the "safe-harbor" provision of the Private Securities Litigation
Reform Act of 1995, regarding the Company's business or financial condition.
Actual results could differ materially from those described in this news
release as a result of numerous factors, some of which are outside the control
of the Company.

    %SEDAR: 00005311E          %CIK: 0001004530

For further information:

For further information: Mountain Province Diamonds Inc., Patrick Evans,
President and CEO, Tel: (416) 670-5114

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