Metminco Regulatory News (MNC)

For immediate release 07 March 2011

Metminco Limited

("Metminco" or "the Company")

Constituent of S&P/ASX 300 Index

Metminco Limited, the exploration company with assets in Chile and Peru, is pleased to announce that it will join the S&P/ASX 300 index from 18 March 2011.

Full details of the notification can be accessed via the following link: www.standardandpoors.com/indices.

William Howe, Managing Director of Metminco, commented:

"Joining the S&P/ASX 300 index will provide Metminco with the opportunity for stronger institutional investment support and wider investor recognition for our six assets in Chile and Peru. I would like to thank our shareholders on the ASX and AIM for their support and we look forward to further strong growth in 2011."

Background on the S&P/ASX 300 index

The S&P/ASX 300 provides up to an additional 100 small cap stocks to the S&P/ASX 200. Index constituents are drawn from eligible companies listed on the Australian Stock Exchange. This index is designed to address investment managers' needs to benchmark against a portfolio characterized by sufficient size and liquidity. S&P/ASX 300 is a component of the Australian indices that could be used as building blocks for portfolio construction.

About Metminco:

Metminco is a dual ASX and AIM listed company with a portfolio of copper and gold projects in Peru and Chile. The Los Calatos project located in southern Peru has JORC compliant resources of 926 million tonnes, consisting of Indicated Resources of 111 million tonnes at 0.39% Cu and 380ppm Mo and Inferred Resources of 815 million tonnes at 0.37% Cu and 260ppm Mo(at a 0.2% copper cut-off grade).

The Chilean assets include a 50% interest in the Mollacas copper leach project with JORC compliant resources of 17 million tonnes consisting of Indicated Resources of 7.2 million tonnes at 0.56% copper and Inferred Resources of 9.8 million tonnes @ 0.52% copper (at a 0.2% copper cut-off grade); and a 50% interest in the Vallecillo gold zinc project with JORC compliant resources of 10.1 million tonnes consisting of Indicated Resources of 7.9 million tonnes @ 1.14g/tAu; 11.4g/tAg; 1.32% Zn; 0.29% Pb and Inferred Resources of 2.2 million tonnes @ 0.78g/t Au; 8.2g/t Ag; 0.58% Zn; 0.26% Pb (at a cut-off grade of 0.3g/t Au).

For further information please contact:

South America:

William Howe - Managing Director Ph: +56 (2) 411 2600

Australia:

William Etheridge - Executive Director Ph: + 61(0) 419 400 919

Phillip Wing - Executive Director Ph: + 61(0) 412 254 704

Philip Killen - Company Secretary & CFO Ph: + 61(0) 408 609 916

Ian Howarth (Collins St Media) Ph: + 61(0) 407 822 319

United Kingdom:

Tim Read - Non-Executive Director +44 (0)7777 721 809

Stephen Cooper (Investec Bank plc) +44 (0)20 7597 5104

Tim Thompson / James Strong / Katharine Sutton +44 (0) 20 7466 5000

(Buchanan Communications)