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 4 May 2012 were:

710.65p Capital only (undiluted)
720.36p 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.

6. As explained in the Company's Annual Results Announcement, released on 23
February 2012, the Board has reviewed its current policy of allocating 100% of
management fees and finance costs to the revenue account. In order to ensure
the Company's expense allocation policy is more aligned to with industry norms,
these expenses will be allocated in the ratio 25% to revenue and 75% to capital
for the financial year ending 31 December 2012. This change in allocation is
reflected in the Company's NAV at close on 23 February 2012 for the first time.
There is no impact on the Company's cum-income NAV. The impact on the Company's
capital only NAV at 23 February 2012 is not material.