Coeur d'Alene, Idaho - Metalline Mining Company (NYSE Amex: MMG) is pleased to announce that on March 9, 2010 its joint proxy statement/prospectus on Form S-4 was declared effective by the Securities and Exchange Commission. The proposals described in the definitive joint proxy statement/prospectus, which include a proposal to effect the merger transaction with Dome Ventures Corporation, will be presented to Metalline's shareholders at a special meeting to be held on April 15, 2010. Starting on March 12, 2010, Metalline began distributing materials regarding that meeting to its shareholders. Materials regarding the meeting are also available on the Securities and Exchange Commission's website. Additionally, information regarding Metalline and Dome, including a Technical Report prepared in accordance with National Instrument 43-101 regarding Metalline's Sierra Mojada Project, is available on SEDAR.com under the reports and documents filed by Dome.

Metalline will hold the shareholders meeting to present several proposals to its shareholders, including the approval of the issuance of its shares of common stock to effect the merger transaction with Dome Ventures Corporation. Metalline's meeting of shareholders will be held on April 15, 2010 at 6400 South Fiddlers Green Circle, Suite 1000, Greenwood Village, CO 80111 at 10:00 a.m. Mountain Time. On January 11, 2010 Metalline filed its Annual Report on Form 10-K for its fiscal year ended October 31, 2009. That Annual Report is a part of the materials being distributed to shareholders for Metalline's April 15, 2010 meeting of shareholders. The audit report filed with Metalline's 2009 Form 10-K includes a qualification as to the Company's ability to continue as a going concern. As described in Metalline's Form 10-K, if the merger transaction with Dome is completed Metalline management believes that the $13,010,000 currently held in escrow by Dome will address the going concern qualification and be sufficient to satisfy Metalline's working capital needs into Metalline's 2011 fiscal year and through completion of a preliminary economic analysis at Metalline's Sierra Mojada Project.

About Metalline Mining Company 
Metalline Mining Company is focused on mineral exploration. The Company currently owns mineral concessions in the municipality of Sierra Mojada, Coahuila, Mexico. The Company conducts its operations in Mexico through its wholly owned Mexican subsidiaries, Minera Metalin S.A. de C.V. and Contratistas de Sierra Mojada S.A. de C.V. To obtain more information on Metalline Mining Company, visit the Company's web site (www.metallinemining.com).

Forward-Looking Statements 
This news release contains forward-looking statements regarding future events and Metalline's future results 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"). These statements are based on current expectations, estimates, forecasts, and projections about the industry in which Metalline operates and the beliefs and assumptions of Metalline's management. Words such as "expects," "anticipates," "targets," "goals," "projects," "intends," "plans," "believes," "seeks," "estimates," "continues," "may," variations of such words, and similar expressions, are intended to identify such forward-looking statements. In addition, any statements that refer to projections of Metalline's future financial performance, Metalline's anticipated growth and potentials in its business and other characterizations of future events or circumstances are forward-looking statements. 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 elsewhere herein, Metalline's Annual Report on Form 10-K for the fiscal year ended October 31, 2009 under "Risk Factors." Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. Metalline undertakes no obligation to revise or update any forward-looking statements for any reason.