Portfolio Update

BLACKROCK WORLD MINING TRUST plc
All information is at 31 July 2011 and unaudited.

Performance at month end with net income reinvested
                                One     Three       One     Three      Five
                              Month    Months      Year     Years     Years
Net asset value* (undiluted)   0.2%     -0.6%     36.6%     27.6%    104.5%          
Net asset value* (diluted)     0.2%     -0.6%     36.6%     29.1%    106.9%          
Share price*                   0.5%     -4.7%     35.4%     28.2%    101.7%          
HSBC Global Mining Index      -1.5%     -5.1%     25.0%     34.2%    114.5%          

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:                          918.64p#           913.97p
# Includes net revenue of 4.67p                                                
                                                                               
Share price:                                760.00p                       
Discount to NAV**:                            16.8%                       
Total assets:                            £1,690.63m                       
Net yield:                                     0.8%                       
Gearing:                                       3.5%                       

Ordinary shares in issue:               177,537,242                                          
Ordinary shares held in Treasury:        15,474,600                                   

** Discount to NAV based on capital only.                                      
                                                                               
Sector                % Total  Country Analysis              % Total
                       Assets                                 Assets
                                                                               
Diversified              38.5   Global                          41.6 
Base Metals              23.0   Latin America                   19.3 
Industrial Minerals      15.1   Australasia                     14.2 
Gold                      9.6   Other Africa                     8.9 
Silver & Diamonds         8.3   South Africa                     6.2 
Platinum                  3.8   Canada                           1.8 
Other                     0.4   USA                              1.7 
Net current assets        1.3   Emerging Europe                  1.7 
                        -----   Republic of Congo                1.3 
                        100.0   Democratic Republic of Congo     0.9 
                        =====   Mongolia                         0.7 
                                Indonesia                        0.4 
                                Net current assets               1.3 
                                                               ----- 
                                                               100.0 
                                                               ===== 

Ten Largest Investments                                                        
                                                                               
Company                                 % Total Assets  
Rio Tinto                                          9.0  
Vale                                               6.7  
BHP Billiton                                       6.5  
Glencore Finance (Europe) 5% 31/12/14              5.2  
Minas Buenaventura                                 4.7  
First Quantum Minerals                             4.6  
Fresnillo                                          4.3  
Teck Resources                                     4.1  
Iluka Resources                                    3.9  
Freeport McMoRan                                   3.8  

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

Performance
A number of factors in the macro environment weighed heavily on markets and
created volatility. Most notable was the nervous wait for a decision on whether
the US administration would raise the debt ceiling. Despite this and the
uncertainty in the US economy as well as wider sovereign debt issues,
industrial metals were relatively stable and precious metals rallied.

Silver, gold and palladium were the stand-out-performers, returning 13.2%, 7.5%
and 8.3% respectively as investors took flight to `safe haven assets.' Strength
returned to the silver price as it continued to be used by investors as a high
beta proxy for the rising gold price. The precious metal also benefited from
increased demand from the solar industry, which has added to industrial demand.

The acceptance of gold as an alternative currency has been highlighted by a
number of Central Bank purchases in the first half of 2011. In July, South
Korea and Thailand both announced they had increased their gold holdings. While
traditional reserve currencies continue to weaken as a result of fears over
levels of sovereign debt, an asset with no liabilities such as gold holds
attractive qualities for Central Bank balance sheets.

Base metals also delivered positive returns with both zinc and nickel rising
more than 5%. The copper price remained above $4.40/lb over the month, an
increase of around 20% to the average price in 2010. This is symptomatic of
strong supply/demand fundamentals in the market and suggests that the relative
outlook for copper remains positive.

M&A activity continued with BHP Billiton announcing a further move into the
shale gas arena through the acquisition of Petrohawk, following on from their
earlier purchase of assets from Chesapeake this year. This provides BHP
Billiton with access to people with key skills in the shale gas business, a
large asset base where they can accelerate production growth, as well as a
strong base of technical expertise. Although this is a relatively large
acquisition it could prove to be a shrewd move if this is a cyclical low in the
US gas business.

Strategy/Outlook
2011 has so far been a volatile period for mining equities. The sector has at
times been at the mercy of macroeconomic uncertainty and has broadly been at
the forefront of any risk on/risk off trade. The fundamentals for our favoured
commodities continue to look supportive.

The strength of those fundamentals are not being fully reflected in equity
valuations which look attractive not only on a historical basis but also when
considered in light of the exceptional levels of free cashflow mining companies
are able to generate at current commodity prices. The trends of more mergers
and acquisition activity as well as returns to shareholders in the form of
dividends and share buybacks are likely to get further traction in the second
half of the year.

16 August 2011

ENDS

Latest information is available by typing www.blackrock.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.