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 17 April 2009 was:

395.87p Capital only (undiluted)

398.19p Including current year income (undiluted)- XD

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. 166,000 ordinary shares were purchased on 3 February 2009, bringing the
total amount of ordinary shares held in Treasury to 15,249,600.

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. Today's NAV includes an adjustment of £2.2m representing VAT recovered as a
result of the JPMorgan Claverhouse VAT case. This VAT recovery has been
allocated wholly to the revenue account in accordance with the original
allocation of the management fees. The impact on the NAV is estimated to be an
increase of approximately 30 basis points.