Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

(1). Identity of the issuer or the underlying issuer of existing shares to
which voting rights are attached (ii):

BlackRock World Mining Trust plc

(2). Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights: ( )

An acquisition or disposal of qualifying financial instruments which may result
in the acquisition of shares already issued to which voting rights are
attached: ( )

An acquisition or disposal of instruments with similar economic effect to
qualifying financial instruments: ( )

An event changing the breakdown of voting rights: ( )

Other (please specify) : Application of trading book exemption (DTR 5.1.3{4})
(X)

(3). Full name of person(s) subject to the notification obligation (iii):

Credit Suisse Group AG

(4). Full name of shareholder(s) (if different from 3.) (iv):

Credit Suisse Securities (Europe) Ltd
Credit Suisse International

(5). Date of the transaction and date on which the threshold is crossed or
reached (v):

N/A

(6). Date on which issuer notified:

18 February 2010

(7). Threshold(s) that is/are crossed or reached (vi, vii):

3%

(8). Notified details:

A: Voting rights attached to shares (viii, ix):

Class/type of shares (if possible using the ISIN code): Ordinary / GB0005774855

Situation previous to the triggering transaction:
Number of Shares: 7,010,833
Number of Voting rights: 7,010,833

Resulting situation after the triggering transaction:
Number of shares (Direct): N/A

Number of voting rights:
Direct (xi): N/A
Indirect (xii): Not reportable

% of voting rights (x):
Direct: N/A
Indirect: Not reportable


B. Qualifying Financial Instruments

Resulting situation after the triggering transaction:

Type of financial instrument: N/A

Expiration date (xiii):

Exercise/Conversion Period (xiv):

Number of voting rights that may be acquired if the instrument is exercised/
converted:

% of voting rights:


C. Financial Instruments with similar economic effect to Qualifying Financial
Instruments (xv, xvi)

Resulting situation after the triggering transaction

Type of financial instrument: N/A

Exercise price:

Expiration date (xvii):

Exercise/Conversion period (xviii):

Number of voting rights instrument refers to:

% of voting rights (xix, xx):

Total (A + B + C):

Number of voting rights: Not reportable

Percentage of voting rights: Not reportable

(9). Chain of controlled undertakings through which the voting rights and/or
the financial instruments are effectively held, if applicable (xxi):

1. Credit Suisse Group AG
2. Credit Suisse AG
2.1. Credit Suisse Securities (Europe) Ltd
2.2. Credit Suisse International

Proxy Voting:

(10). Name of the proxy holder:

(11). Number of voting rights proxy holder will cease to hold:

(12). Date on which proxy holder will cease to hold voting rights:

(13). Additional information:

(14). Contact name:

Ms C Driscoll
For BlackRock Investment Management (UK) Limited
Secretary

(15). Contact telephone number:

020 7743 2427


19 February 2010