Portfolio Update

BLACKROCK WORLD MINING TRUST plc
All information is at 31 May 2012 and unaudited.

Performance at month end with net income reinvested
                                 One    Three      One    Three     Five
                               Month   Months     Year    Years    Years
Net asset value* (undiluted)  -14.0%   -21.1%   -28.3%    42.0%     4.0%
Net asset value* (diluted)    -14.0%   -21.1%   -28.3%    42.0%     8.8%
Share price*                  -14.1%   -21.4%   -24.9%    42.9%     6.3%
HSBC Global Mining Index      -11.7%   -21.4%   -30.6%    18.7%    13.1%

Sources: BlackRock, HSBC Global Mining Index, Datastream

*Net asset value and share price performance includes the warrant reinvestment,
assuming the 2004 and 2006 bonus warrant entitlement per share was sold and the
proceeds reinvested on the first day of trading.

At month end
Net asset value           Including Income            Capital Only
Undiluted/diluted:                 649.09p*                638.07p
*Includes net revenue of 11.02p

Share price:                       574.00p
Discount to NAV**:                   11.6%
Total assets:                   £1,252.75m
Net yield***:                         2.4%
Gearing:                              8.9%

Ordinary shares in issue:          177,287,242
Ordinary shares held in Treasury:   15,724,600

** Discount to NAV including Income.
*** Based on final ordinary dividend of 14.00p per share in respect of the year
ended 31 December 2011.

Sector                   % Total    Country Analysis          % Total
                          Assets                               Assets
Diversified                 39.8    Global                       43.0
Base Metals                 20.4    Latin America                19.3
Industrial Minerals         12.4    Other Africa                 10.9
Gold                         9.8    Australasia                  10.7
Silver & Diamonds            8.2    South Africa                  6.0
Platinum                     2.6    Republic of Congo             1.0
Energy Minerals              1.1    Emerging Europe               1.0
Net current assets           5.7    Democratic Republic of Congo  1.0
                           -----    Canada                        0.6
                                    USA                           0.4
                           100.0    Indonesia                     0.3
                           =====    Mongolia                      0.1
                                    Net current assets            5.7
                                                                -----
                                                                100.0
                                                                =====

Ten Largest Investments                      % Total
                                              Assets
Company
Rio Tinto                                        8.2
BHP Billiton                                     7.9
Vale                                             7.0
Glencore Finance (Europe) 5% 31/12/14            6.1
Minas Buenaventura                               4.9
First Quantum Minerals                           4.1
Iluka Resources                                  3.7
Teck Resources                                   3.6
Industias Peñoles                                3.4
Fresnillo                                        3.4
 

Commenting on the markets, Evy Hambro, representing the Investment Manager 
noted:

Performance
Both commodities and equities sold off during the month as the outlook for the
global economy deteriorated.  Weakness was most evident in industrial
commodities such as platinum and copper, which fell by 10.5% and 12.9%
respectively (Datastream in USD terms). 

Markets were dominated by uncertainty around the stability of Spanish banks,
the upcoming Greek election and the potential ripple effects of a Greek exit
from the Euro.  It is not just Eurozone woes that hit market confidence during
the month.  There were also certain data points from China, including
disappointing electricity generation numbers, that caused concern about
economic activity in the economy which is the largest consumer of many
commodities.  However, signs of monetary easing in China (interest rates were
reduced by 0.25%) and recent commodity import data, may be more indicative of a
'soft landing' scenario.

It has been mooted that demand weakness from China may be offset by an
improving outlook in the US, which has exhibited positive signs of recovery and
has benefited from low energy prices.  However, it is worth remembering that
China remains the largest consumer of most commodities and a stronger than
expected recovery in the US is unlikely to be as influential on global demand
dynamics. 

While the iron ore price has declined over the past month, trending down by
about 7% to $138/t (China CFR spot price, CLSA), producers of this steel making
commodity continue to benefit from a robust price that is significantly above
their cost of production.  The portfolio has iron ore exposure via diversified
mining companies (eg Rio Tinto) and single commodity producers (eg Fortescue);
both types of exposure have strong cash margins and growth options to increase
production volumes.

Strategy/Outlook
The global macro-economic outlook and fragile investor sentiment continue to
drive the near-term performance of the mining sector.

While markets have suffered over the past month, recent policy changes in
China, such as cutting interest rates by 0.25%, are supportive of stimulating
economic growth which should be supportive of demand for commodities.  The
supply side continues to be challenged by both short term factors, such as
weather events, and longer term factors such as labour shortages and grade
declines. 

Mining company valuations look attractive across a variety of metrics. Balance
sheets have been bolstered by a more conservative approach to gearing
management and record operational cashflow generation. Mining managements have
also shown themselves more willing to share that balance sheet strength with
investors through dividends and buybacks, a trend they would do well to
continue.

14 June 2012

ENDS

Latest information is available by typing www.brwmplc.co.uk on the internet,
"BLRKINDEX" on Reuters, "BLRK" on Bloomberg or "8800" on Topic 3 (ICV
terminal).  Neither the contents of the Manager's website nor the contents of
any website accessible from hyperlinks on the Manager's website (or any other
website) is incorporated into, or forms part of, this announcement.