News Releases

June 3, 2010

Progress on Planned Activities at Sierra Mojada

Coeur d'Alene, Idaho - Metalline Mining Company (NYSE Amex: MMG) announces progress on the planned activities that are detailed in its Press Release dated May 7, 2010. The aggressive exploration drill program, planned to increase to 6 drills has been increased to 7 drills and will be completed with the arrival of Metalline's reverse circulation drill which is in transport to Sierra Mojada from Salt Lake City, Utah. Metalline's 3 large diamond drills are operating 2 eight hour shifts per day 6 days per week, 2 diamond core drills were contracted and are operating 24 hours 7 days per week. In addition 1 reverse circulation drill was contracted to drill and set casing through alluvium and operates 20 twelve hour shifts, then a 10 day break. All 7 drills will continue drilling in the west end of the district, predominantly on the North Side silver resource that was announced previously; see the Google drill map on Metalline's web site. The program ramp-up has gone very well. Metalline has a drill hole sample stockpile of about 7000 samples. These samples were analyzed by Metalline's assay lab and exceed the screen limit of 10 g silver and/or 1% zinc. They are being shipped for assay to ALS CHEMEX, Vancouver at the rate of 700¬1000 samples per week. Currently there are over 2000 samples in process for assay and the first results are beginning to be returned. The results of this work will be released as results are received and evaluated.

The analytical work includes certified standards, blanks, and duplicate samples as required to comply with international engineering sta ndards. The work is under the supervision of Terry Brown, Vice President of Metalline, and Roger Kolvoord, Executive Vice President, both of whom meet the requirements for Qualified Person under Canadian securities regulations.

Metalline plans to complete a comprehensive update of the resource model by the end of 2010. An initial program of metallurgical test work is in progress to assess recoveries by various process methods that can be expected from the silver and associated zinc, copper and lead mineralization. This program will be expanded as more samples are available from core drilling in the west end. The results of drilling and metallurgy studies are scheduled to be available for use in a Preliminary Economic Assessment (Scoping Study) beginning early next year.

Forward-Looking Statements
This news release contains forward-looking statements regarding future events that are subject to the safe harbors created under the Securities Act of 1933 (the "Securities Act") and the Securities Exchange Act of 1934 (the "Exchange Act") and "forward-looking information" within the meaning of applicable Canadian securities laws. Forward-looking statements include statements and expectations that describe Metalline's future plans, objectives or goals. Forward-looking statements may be identified by such terms as "anticipates," "believes," "could," "estimates," "expects," "may," "shall," "will," or "would." Since forward-looking statements are based on assumptions and address future events and conditions, by their very nature they involve inherent risks and uncertainties. Actual results relating to, among other things, Metalline's operations and results, could differ materially from those currently anticipated in such statements for many reasons such as changes in general economic conditions and conditions in the financial markets, changes in demand and prices for minerals, or technological and operational difficulties encountered in connection with the activities of the companies. Readers are cautioned that these forward-looking statements are only predictions and are subject to risks, uncertainties, and assumptions that are difficult to predict, including those identified in Metalline's Annual Report on Form 10-K for the fiscal year ended October 31, 2009 under "Risk Factors." These and other factors should be considered carefully and readers should not place undue reliance on the Dome's and Metalline's forward-looking statements. Neither Dome nor Metalline undertakes to update any forward-looking statement that may be made herein, except in accordance with applicable securities laws. Neither the 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.