Net Asset Value(s)

NET ASSET VALUE

BLACKROCK WORLD MINING TRUST PLC

The unaudited net asset values for BlackRock World Mining Trust plc at close of
business on 10 May 2012 were:

681.94p Capital only (undiluted)
691.80p 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. The undiluted net asset value per share has been calculated on 177,287,242
ordinary shares excluding 15,724,600 held in treasury.

4. 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).

5. Following the purchase of 150,000 shares to be held in Treasury on Friday 9
September 2011 the Company's issued share capital is 193,011,842 Ordinary
Shares including 15,724,600 shares held in Treasury.