Constellation Copper Corp. - Lisbon Valley Mine Production Progress and Update

Lisbon Valley Mine Production Progress and Update

Denver, Colorado, June 20, 2006 - Constellation Copper Corporation (CCU: TSX) is pleased to announce production progress and an update on the ramp-up of production towards full production capacity.

Cathode Copper Production and Sales
The Lisbon Valley SX-EW plant harvested its first cathode copper in mid April, 2006, and produced 804,000 lbs. of copper during the month. This copper was sold at an average COMEX price of $3.69/lb., subject to final settlement adjustment, plus a cathode premium of $0.069/lb. Initial cathode quality was very good.

Copper production in May totaled 1,544,000 lbs., all of which met or exceeded the LME and COMEX quality standards for Grade A copper. Cathode sales for May received an average price of $3.87/lb. plus a cathode premium of $0.069/lb. The Lisbon Valley cathode, while new to the market, is receiving total acceptance with its current customers. These end users are placing increased sales orders for our cathode.

EW cathode copper production will continue to ramp up towards design capacity of 4.5 million pounds per month. We expect to achieve this production goal by the end of the third quarter 2006.

Mine Production and Crusher Throughput
Mine production and crusher throughput has steadily increased through April 2006, when a total of 516,000 wet short tons of ore (17,200 tons per day) were stacked on the leach pad. Total tons of ore placed on the pad as of end of May exceed 2.8 million tons, containing 13.6 million pounds of copper. Tons to the pad fell off slightly in May, due to down-time in the secondary crushers associated with processing a zone of finer grained material and due to scheduled maintenance at the primary crusher. Several modifications are being implemented to alleviate this constraint in order to continue to ramp up the crushing and stacking rate towards the target capacity 24,000 tpd throughput.

Mine Production Reconciliation with Reserves
Mining of ore to date has been primarily from the Sentinel pits. Through May 2006 reconciliation of ore mined to the reserve model has been very good. To date the reconciliation at the Sentinel pits shows production is up 31.45% on tons compared to the reserves, down 14.2% on grade, but up 13.1% on contained pounds of copper. Bench reconciliations continue to improve as we progress deeper into the deposit after mining the leached upper portion. Waste mining is down proportionately to the additional ore tons mined. Mining from the Centennial pit has been primarily in waste, and as such there is no ore reconciliation available from that deposit.

Exploration and Resource Expansion
A review of the resource base, primarily at the Centennial deposit, reveals a significant number of mineralized areas falling just outside of and below the current pit design that have insufficient drilling done to classify these areas as resources for modeling and pit design purposes. A drilling program has been designed to increase the drill density in these areas that would allow these zones of mineralization outside of the current pit design to be re-classified as resources, and incorporated into the resource base for year-end resource and reserve reporting purposes. That drilling program will get underway in the next month.

Flying Diamond Drilling
Drilling on the Flying Diamond deposit area, located four miles south of the mine and plant site, is continuing with the issuance of a permit from the US Bureau of Land Management for a total of 41 new drill sites. These sites are located immediately to the northwest of the area of the initial thirteen discovery holes and between these holes and three holes located 10,000 feet to the north of the discovery area that were reported earlier this year. Drill results will be reported in meaningful batches after assays have been received and reviewed.

These drilling programs will be performed under the supervision of Mr. Tony Adkins, Exploration Manager for Lisbon Valley Mining Company. Mr. Adkins is a certified Professional Geologist, Registered Geologist, and a qualified person.

Progress continues on all fronts at the Lisbon Valley mine, and we look forward to continued increases in our cathode copper production and sales revenues at current COMEX copper and cathode premium prices.

This press release has been reviewed and approved by the Disclosure Committee of the Company.

For further information please contact:

Constellation Copper Corporation
Gregory A. Hahn, President & CEO
Michelle Hebert, Manager, Corporate Affairs
Tel: (720) 228-0055
Toll Free: 1-877-370-5400
Fax: (303) 863-1736
info@constellationcopper.com
www.constellationcopper.com

Renmark Financial Communications Inc.
Neil Murray-Lyon : nmurraylyon@renmarkfinancial.com
Tina Cameron : tcameron@renmarkfinancial.com
Media - Lynda Martineau : lmartineau@renmarkfinancial.com
Tel.: (514) 939-3989
Fax: (514) 939-3717
www.renmarkfinancial.com


The Toronto Stock Exchange does not accept responsibility for the adequacy or accuracy of this press release.