Private Placement Increase

Rio Grande Mining Corp. (RGV-TSX V)

Suite 200 – 551 Howe Street Vancouver, BC, V6C 2C2 Tel: (604) 683-8610 Fax: (604) 683-4499

FOR IMMEDIATE RELEASE September 20, 2010

PRIVATE PLACEMENT INCREASE

The Company is pleased to announce that further to its news release of September 13, 2010, it has increased its private placement to 2,666,667 units at $0.225 per unit for total gross proceeds of $600,000. All other terms of the placement remain the same.

On Behalf of the Board,

“Jerry A. Minni”

Jerry A. Minni 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.

WARNING: The Company relies on litigation protection for “forward looking” statements. Actual results could differ materially from those described in the news release as a result of numerous factors, some of which are outside the control of the Company.