OTTAWA, ONTARIO -- (Marketwire) -- 08/05/10 -- Caribou Copper Resources Ltd. (TSX VENTURE: CKR) (the "Company") is pleased to announce the results of its recently completed trenching program.

As part of this year's exploration activities on its Caribou Dome property, and in preparation for this year's drilling, the Company exposed copper mineralization in nine (9) trenches in the eastern portion of mapped surface mineralization. Fifty-three (53) chip samples were collected across visible oxide copper mineralization of which fifty-one (51) were collected within the nine trenches. One (1) additional grab sample was taken from an outcrop in the same area.

The samples were sent to ALS Chemex in Fairbanks, Alaska for analysis. ALS Chemex assay procedure ME-ICP61 was used to quantify the presence of 33 elements, with those assays showing greater than 1.0% copper being subjected to an additional Cu-OG62 procedure. In addition, all of the samples were tested for gold using ALS Chemex assay procedure Au-AA25.

Individual sample assays were combined by the Company to produce results for each trench. A cut-off grade of 0.5% Cu was used in determining the length of mineralization in each trench. Trench results are summarized below:

Trench 1 - 2.69% Cu over 2 meters

Trench 3 - 3.23% Cu over 3 meters, (including 4.4% over 2m); 5.1g Ag over 1m

Trench 4 - 4.03% Cu over 7 meters, (including 7.13% over 3m); 6.18g Ag over 7m (including 9.9g Ag over 4m)

Trench 5 - 2.96% Cu over 2 meters; 6.35g Ag over 2m

Trench 6 - 1.99% Cu over 2 meters; 17.8g Ag over 3m (including 27.6g Ag over 1m)

Trench 7 - 1.7% Cu over 7 meters, (including 4.12% over 1m); 7.8g Ag over 7m

Trench 9 - 1.36% Cu over 4.5 meters, (including 3.14% over 0.5m); 1.5g Ag over 4.5m

Trench 10 - 2.92% Cu over 2 meters, (including 4.85% over 1m); 3.85g Ag over 2m

Trench 11 - 3.78% Cu over 2.5 meters, (including 7.77% over 1m)

Sample 959607, taken approximately 20 meters west of Trench 4 across the mineralized trend - 7.9% Cu over 1 meter; 12.9g Ag over 1m.

Sample 959608, taken across the surface mineralization of lode 8 - 2.48% Cu over 1 meter.

The highest assayed grade of 8.92% Cu over 1m was noted in Trench 4 with the highest assayed grade of Ag of 27.6g/ton occurring outside the Cu cut-off in Trench 6.

The results of this field work will be used to identify drill targets in lodes 3, 7 and 8, which have seen very little historic drilling.

About the Company:

Caribou Copper Resources Ltd. is a copper exploration and development company with 97 mining claims covering 16 square miles in Alaska. Its 10,240 acre Caribou Dome property is located in the Talkeetna mining district in south-central Alaska in the pass between Windy Creek and the south fork of Pass Creek in the Clearwater Mountains. By air, it is about 160 miles northeast of Anchorage, Alaska or about 110 miles south of Fairbanks, Alaska.

The technical contents of this release were approved by Bernie Stannus of BRS Mining, a director of the Company and a qualified person as defined by National Instrument 43-101.

ON BEHALF OF CARIBOU COPPER RESOURCES LTD.

Pierre Vella-Zarb, President, CEO and Director

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.