Net Asset Value(s)

NET ASSET VALUE

BLACKROCK WORLD MINING TRUST PLC

The unaudited net asset value for BlackRock World Mining Trust plc at close of
business on 22 March 2011 was:

871.39p Capital only (undiluted)
879.29p Including current year income (undiluted)

Notes:

1. Investments have been valued on a bid price basis.

2. Revenue items included in net asset value, with dividends payable deducted
on the ex-dividend date.

3. 100,000 ordinary shares were purchased on 29 September 2010 to be held in
treasury.

4. The undiluted net asset value per share has been calculated on 177,537,242
ordinary shares excluding 15,474,600 held in treasury.

5. For the latest daily net asset value, previous month end performance
statistics, asset allocation and ten largest holdings of the BlackRock managed
Investment Trusts; see BLRKINDEX on Reuters or page 8800 on ICB (Topic 3).