Offer Document Posted

Gem Diamonds Limited
20 April 2007

 Not for release, publication or distribution, in whole or in part, in, into or
                                from Australia,
          New Zealand, Canada or Japan or any Restricted Jurisdiction

20 April 2007

                             Recommended cash offer

                            by Gem Diamonds Limited

                                      for

                                BDI Mining Corp

Further to the announcement made on 11 April 2007 of a recommended cash offer by
Gem Diamonds Limited (LSE: GEMD) ('Gem Diamonds') for BDI Mining Corp (AIM: BMG)
('BDI Mining') (the 'Offer'), Gem Diamonds announces that the offer document
containing the full terms and conditions of the Offer (the 'Offer Document') is
being posted to BDI Mining Shareholders today.

Copies of the Offer Document and the Form of Acceptance will be available for
collection by BDI Mining Shareholders from Capita Registrars, The Registry, 34
Beckenham Road, Beckenham, Kent BR3 4TU during normal business hours on any
weekday (Saturdays and public holidays excepted) while the Offer remains open
for acceptance.



Enquiries:

Gem Diamonds
Stephen Wetherall                                           [phone]
Angela Parr                                                 [phone]

Strata Capital                                         [phone]
(Financial Adviser to Gem Diamonds)
Oliver Corner

JPMorgan Cazenove                                     + 44 (0) 20 7588 2828
(Corporate Broker to Gem Diamonds)
Ian Hannam
Jonathan Walker
Neil Passmore

BDI Mining
Martin Horgan                                          [phone]
Reg Spencer                                               [phone]

Ruegg & Co                                             [phone]
(Financial Adviser to BDI Mining)
Brett Miller




Strata Capital UK LLP, which is authorised and regulated in the United Kingdom
by the Financial Services Authority, is acting exclusively for Gem Diamonds and
no one else in connection with the Offer and this announcement and will not be
responsible to anyone other than Gem Diamonds for providing the protections
afforded to clients of Strata Capital UK LLP or for providing advice in
connection with the Offer or this announcement or any matter referred to herein.

JPMorgan Cazenove Limited, which is authorised and regulated in the United
Kingdom by the Financial Services Authority, is acting exclusively for Gem
Diamonds and no one else in connection with the Offer and this announcement and
will not be responsible to anyone other than Gem Diamonds for providing the
protections afforded to clients of JPMorgan Cazenove Limited or for providing
advice in connection with the Offer or this announcement or any matter referred
to herein.

Ruegg & Co Limited, which is authorised and regulated in the United Kingdom by
the Financial Services Authority, is acting exclusively for BDI Mining and no
one else in connection with the Offer and this announcement and will not be
responsible to anyone other than BDI Mining for providing the protections
afforded to clients of Ruegg & Co Limited or for providing advice in connection
with the Offer or this announcement or any matter referred to herein.

This announcement is for informational purposes only and does not constitute an
offer to sell or invitation to purchase any securities or the solicitation of
any vote for approval in any jurisdiction, nor shall there be any sale, issue or
transfer of the securities referred to in this announcement in any jurisdiction
in contravention of applicable law. The Offer will be made solely by the Offer
Document and the Form of Acceptance accompanying the Offer Document, which will
contain the full terms and conditions of the Offer, including details of how the
Offer may be accepted.

The Offer will not be made, directly or indirectly, in, into or from a
Restricted Jurisdiction where to do so would violate the laws in that
jurisdiction, and the Offer is not capable of acceptance from or within a
Restricted Jurisdiction. Accordingly, copies of this announcement and all
documents relating to the Offer are not being, and must not be, directly or
indirectly, mailed or otherwise forwarded, distributed or sent in, into or from
a Restricted Jurisdiction where to do so would violate the laws in that
jurisdiction, and persons receiving this announcement and all documents relating
to the Offer (including custodians, nominees and trustees) must not mail or
otherwise distribute or send them in, into or from such jurisdictions as doing
so may invalidate any purported acceptance of the Offer. The availability of the
Offer to BDI Mining Shareholders who are not resident in the United Kingdom may
be affected by the laws of the relevant jurisdictions in which they are
resident. Persons who are not resident in the United Kingdom should inform
themselves of, and observe, any applicable requirements.

In accordance with normal UK market practice, Gem Diamonds or its nominees or
brokers (acting as agents) may from time to time make certain purchases of, or
arrangements to purchase, BDI Mining Shares outside the United States, other
than pursuant to the Offer, before or during the period in which the Offer
remains open for acceptance. These purchases may occur either in the open market
at prevailing prices or in private transactions at negotiated prices. Any
information about such purchases will be disclosed as required in the UK.


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