Cambridge Mineral - Colombia Update

CAMBRIDGE MINERAL RESOURCES PLC
(AIM:CMR.L)


Update on Colombian Projects

Cambridge Mineral Resources plc ("CMR" or "the Company"), the mining exploration and production
company, announces an update of its activities on its gold mining and exploration projects in
Colombia.


* Quintana gold mine feasibility study completed; forecast annual production 15,000 oz gold

* Quintana JORC compliant resource base 109,852t grading 24.58g/t gold. Operational mine
expected in six months

* El Cinco gold mine drill programme commenced, designed to prove minimum 300,000t resource

* Positive initial results from Mina La Linda and Mina del Sol

* Additional land holdings applied for


Quintana

In June 2007 CMR completed the feasibility study on its Quintana Gold Mine, just 17 months after
commencing operations on the project. The Feasibility Study demonstrated a JORC compliant
resource base totalling 109,852t ore grading 24.58g/t gold and proposed a 50t/d mining operation
with a US$10.8m NPV (10% discount rate) over the current 5.5 year life of mine at a base gold
price of US$600/Toz.

Since completion of the study, CMR has commenced the detailed planning stage to allow as fast a
start up of construction and development as possible once project finance of US$4.5
million is secured. It is hoped that a fully operational plant and mine can be achieved within a
six-month period with annual production reaching 15,000oz gold.

El Cinco/ Colina Negra

Since the announcement of the Colina Negra project in April, CMR has continued to advance the
project through surface and underground exploration works that have resulted in the planning of a
5,000m drill programme at Colina Negra and a 1,850m drill programme at Chingale, with the aim of
proving up at least 300,000t of resources. The average grade of all vein samples to date is 14.24
g/t gold over 1.24m at Chingale and 13.42g/t gold over 1.44m at Colina Negra. Commencement of the
drill programme is pending the completion of infrastructure improvements, such as 22km of road
access to the sites expected to be completed in September 2007.

Additionally, the Company is pleased to report the results of a four-month prospecting campaign
completed on the surrounding licences and applications (5,500ha) made by CMR. This work has
resulted in the definition of four areas for follow-up exploration within the current application
limits, as well as the discovery of a new area outside the original limits, which has since been
applied for. If successful, CMR will increase its land holdings in the El Cinco/ Colina Negra
area to 9,450ha. Prospecting results included the discovery of three inactive artisanal mines and
various areas of large blocks (of size in excess of 1m) of quartz vein float, with samples
returning up to 19.68g/t gold and 40g/t silver. Further work including trenching is now planned
to evaluate the different targets in more detail with the aim of advancing rapidly the most
promising to the drill ready stage.

Mina del Sol

Further to the Press Release of 2nd July 2007, when CMR reported an intersection of 90.0m @ 1.46
g/t gold (with 18.6m @ 5.8 g/t gold), the results of the remaining four drill holes from the
recently completed drill programme at Mina del Sol are as follows:

Drill hole From (m) To (m) Interval (m) Gold (g/t/)

ERD-0702 16.0 22.0 6.0 0.247
ERD-0703 14.0 25.0 11.0 0.165
ERD-0704 25.8 33.7 7.9 1.783
ERD-0705 29.0 34.8 5.8 1.797
and 132.3 137.7 5.4 1.444

These intercepts occur within a zone of extensive mineralization. Hole ERD-0704 carried 138.84m @
0.16 g/t gold and hole ERD-0705 148.5m @ 0.19 g/t gold. Although not of economic grade, the width
and continuity of this mineralization is considered to be highly significant and prospective for
the discovery of a major gold deposit.

It is important to note that this is the first drilling at Mina del Sol. Consequently, the
controls of mineralization are as yet not fully understood, so that some of the drillholes missed
the intended target. However, the information gained from this initial drilling will enable the
next phase of drilling to be better targeted by refining the geological model in terms of the
orientation and controls of the mineralization.

La Linda

Further to the announcement on 10th April 2007, horizontal underground development on the La Linda
vein has now been completed to 51m from the adit portal. Unfortunately, at the level of the adit a
complex faulted section was encountered between 31-49m, which has the effect of both thinning the
vein and reducing the gold grade. The weighted average for the vein along its entire exposed
length in the adit is now 6.02g/t gold and 13.9g/t silver over 0.68m.

It is believed that the fault zone encountered has now been passed and it is planned to continue
further adit development for an additional 50m before commencing vertical development to allow for
definition of the vein in three dimensions.

La Rosaleda

At the La Rosaleda project just south of Remedios town and adjacent to the historic Frontino Gold
Mines property, which has produced over 5.5 million oz gold in over 150 years of continuous
operation, initial prospecting work has identified at least 20 former artisanal workings with
quartz vein material reporting grades up to 4.69 g/t gold and widths up to 1m. Although the
grades reported to date are not considered high, they prove the presence of a gold bearing system
within the area. Using the Company's now extensive knowledge of mineralising systems in the
Frontino Gold Belt, further work will concentrate on identifying the areas where higher grade
bonanza ore shoots may exist.

Three Hills

Due to adverse weather conditions in the southwest of Colombia during the first half of 2007, it
was not possible to complete the proposed prospecting programme of the Three Hills project,
although a field expedition, in early 2007, to the area noted extensive artisanal alluvial gold
workings in the streams draining the area. It is hoped that during late 2007 it will be possible
to complete this programme and define the source of alluvial gold currently being exploited in the
streams. CMR has commenced discussions with a number of international mining companies regarding
the possibility of entering into a joint venture to fast track exploration on the property.


Colin Andrew, Managing Director of Cambridge Minerals, stated:

"The rapid progress our team in Colombia is making across a range of exploration and development
projects is excellent. We feel confident that our projections for early gold production will be
met and we are on course to meet our forecast targets."

Samples from El Cinco, Colina Negra and Mina del Sol have been analysed by SGS, Lima Peru, an
internationally certified laboratory with sample preparation at SGS facilities in Medell?n.
Analysis was by fire assay techniques with both AA and gravity finishes. In addition standard
QA/QC procedures were followed by the random insertions of blanks, lab and field duplicates and
laboratory standards within each sample batch. A final check was to run metallic screen assays to
check for coarse free gold.


9th August 2007

ENQUIRIES:

CAMBRIDGE MINERAL RESOURCES PLC Tel: +44 (0) 20 7663 5618
Colin Andrew, Managing Director candrew@iol.ie

RUEGG & CO LIMITED Tel: +44 (0) 20 7584 3663
Gavin Burnell / Brett Miller

BANKSIDE CONSULTANTS Tel: +44 (0) 20 7367 8888
Michael Padley / Michael Spriggs


About Cambridge:

Cambridge Mineral Resources plc is an AIM-quoted mining and exploration company.

Its principal focus is the exploration for and production of precious metals, base metals and
uranium in the following key target areas:

* South America: Colombia and Peru
* Europe: Spain, Bulgaria and Serbia

The Company has a strong portfolio of mineral projects at varying stages of commercialisation,
supporting its strategy of providing shareholders with attractive upside opportunities.


Information in this press release is based on data reviewed by Colin J. Andrew, BSc ARSM MIMMM FGS
CEng, Managing Director for Cambridge Mineral Resources plc, who is a Chartered Engineer and
Member of the Institute of Materials, Minerals & Mining, and qualifies as a Competent Person in
accordance with the "Guidance Note for Mining, Oil and Gas Companies, March 2006" of the London
Stock Exchange. Mr Andrew has over 30 years experience in mining and mineral exploration and has
consented to the inclusion of the information in the form and context in which it appears.


ENDS


Cambridge Mineral Resources Plc






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