Portfolio Update

BLACKROCK WORLD MINING TRUST plc
All information is at 30 April 2010 and unaudited.

Performance at month end with net income reinvested
                                    One     Three       One     Three      Five
                                  Month    Months      Year     Years     Years
Net asset value* (undiluted)      -3.0%     16.9%     71.4%     23.0%    218.1%          
Net asset value* (diluted)        -3.0%     16.9%     71.4%     27.0%    217.5%          
Share price*                      -1.7%     20.2%     64.2%     18.6%    208.9%          
HSBC Global Mining Index          -1.7%     19.7%     69.4%     54.9%    253.3%          

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:                               714.38p#           712.86p
# Includes net revenue of 1.52p                                                
                                                                               
Share price:                                     610.50p                       
Discount to NAV**:                                 14.4%                       
Total assets:                                  £1,303.8m                       
Net yield:                                          0.8%                       
Gearing:                                            2.6%                       

Ordinary shares in issue:          177,762,242                                          
Ordinary shares held in Treasury:   15,249,600                                   

** Discount to NAV based on capital only.                                      

Sector                  % Total   Country Analysis         % Total
                         Assets                             Assets
                                                                               
Diversified                46.2   Latin America               27.0 
Base Metals                19.8   Global                      23.6 
Gold                       11.9   South Africa                10.9 
Platinum                    7.8   Other Africa                10.6 
Silver and Diamonds         6.5   Australasia                  8.9 
Industrial Minerals         6.2   Canada                       5.8 
Other                       0.4   India                        3.4 
Net current assets          1.2   USA                          3.3 
                                  Indonesia                    3.0 
                                  Emerging Asia                1.3 
                                  Europe                       1.0 
                                  Net current assets           1.2 
                          -----                              ----- 
                          100.0                              100.0 
                          =====                              ===== 

Ten Largest Equity Investments (in alphabetical order)                          
                                                                               
Company                                                                        
BHP Billiton                                                                   
First Quantum Minerals                                                         
Freeport McMoRan                                                               
Fresnillo                                                                      
Glencore Finance (Europe) 5% 31/12/14                                          
Impala Platinum                                                                
Minas Buenaventura                                                             
Rio Tinto                                                                      
Teck Resources                                                                 
Vale                                                                           


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

Performance
Equity markets continued to waiver over the month as the International Monetary
Fund and the European Union negotiated the terms of the rescue package for
Greece. Towards the end of the month ratings agencies downgraded the credit
ratings for Greece (BB+), Portugal (A-) and Spain (AA). As a result of this
investors moved out of risk assets, and equity markets fell. Concerns that
these downgrades would spread to other weak countries added to nervousness in
the market and investors continued their 'flight to safe haven assets' such as
gold. The Euro weakened over the month on the back of these issues and gold
bullion strengthened.

Investors have continued to fret over the potential impact on commodity prices
of monetary tightening in China. In Q1 China's economy grew at 11.9%, a level
that is largely perceived to be unsustainable. The Chinese government have so
far this year taken strong steps to try and manage their economy through
increasing bank reserve requirements and it is expected that they may continue
to do this by raising interest rates later this year. We believe that these
measures should not negatively impact commodity prices as while demand growth
from China is slowing, there appears to be increased demand emerging from the
developed world.

Following the Henry Tax Review, the Australian government has proposed a
Resources Super Profits Tax (RSPT). This tax, at 40%, applies to earnings from
resource deposits in Australia from July 2012. The current proposal by the
Australian government is deemed to be negative for those operating in Australia
and it is likely that the proposed legislation will evolve before it is
finalised. Before this proposal is passed there will be stakeholder
consultations and a government election which may be instrumental in the final
proposal. Mining share prices fell following this news. We believe further
weakness in the market may present a significant buying opportunity for the
Company.

Recent reports on the automotive industry have indicated that global car
production has risen by more than 50% in the first quarter of the year. This
news is positive for the mining sector as it suggests that global demand may be
starting to stabilise; however concerns remain around how much of this demand
has been driven by government scrapping incentive schemes.

In company news, Newcrest Mining followed up their previous bid for Lihir Gold
with a higher offer of A$9.5bn (+6.4%). This offer was positively received with
Lihir directors agreeing to the cash and shares offer and recommending this is
approved by shareholders, though interestingly they have remained open to other
bids. This merger will increase Newcrest's gold reserves by approximately 45%
creating the fourth largest listed gold company in the world with assets in
Australia, Papua New Guinea, Indonesia, Fiji and Africa.

There was further M&A activity in the sector over the month as the Norwegian
metal producer Norsk Hydro acquired Vale's aluminium assets for $4.9bn. The
assets in Brazil will give Norsk Hydro access to one of the largest bauxite
mines in the world, as they look to secure long term supply of raw materials
for their aluminium smelters. We believe M&A activity is likely to continue on
a selective basis over the forthcoming year.

Over the month, a number of companies in the mining sector announced their
reporting for Q1 2010. This was positive for a number of the Company's holdings
who announced dividend increases and showed strong balance sheets.

Strategy/Outlook
Over the past month there has been continued turbulence in the markets as
investors fretted over the credit worthiness of Greek, Portuguese and Spanish
sovereign debt. Although data for recovery in commodity consumption in the
developed world appears to be continuing on a positive trend, the sovereign
debt concerns are likely to drive near-term market volatility.

We remain positive on the medium to long term outlook as robust growth in
emerging market countries continues and the ability of the supply side to react
to increasing demand is constrained in selected commodities. While we believe
short term volatility in the sector is likely, stock selection and commodity
selection will be key in order to take advantage of opportunities in these
markets. At current commodity prices, the cashflow generation of existing
production is significant and not fully reflected in current valuations in our
view.

Latest information is available by typing www.blackrock.co.uk/its on the
internet, "BLRKINDEX" on Reuters, "BLRK" on Bloomberg or "8800" on Topic 3 (ICV
terminal).

13 May 2010