QuickLinks -- Click here to rapidly navigate through this document



SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE TO

Tender Offer Statement under Section 14(d)(1) or 13(e)(1)
of the Securities Exchange Act of 1934

INCO LIMITED
(Name of Subject Company (Issuer))

COMPANHIA VALE DO RIO DOCE
and
CVRD CANADA INC.
(Names of Filing Persons (Offerors))

Common Shares
(Title of Class of Securities)

CUSIP NO. 453258402


(CUSIP Number of Class of Securities)

Clovis Torres Junior
Companhia Vale do Rio Doce
Av. Graça Aranha 26
Rio de Janeiro, Brazil
(55) 21 3814-4477

Copies to:

William J. Braithwaite
Kenneth G. Pogrin
Stikeman Elliott LLP
5300 Commerce Court West
199 Bay Street
Toronto, Ontario M5L 1B9
(416) 869-5500
Jeffrey S. Lewis
David I. Gottlieb
Cleary Gottlieb Steen & Hamilton LLP
One Liberty Plaza
New York, NY 10006
(212) 225-2000

(Name, Address and Telephone Numbers of Person
Authorized to Receive Notices and Communications on Behalf of Filing Persons)

CALCULATION OF FILING FEE



Transaction Valuation*
  Amount of Filing Fee**

N/A   N/A


o
Check the box if any part of the fee is offset as provided by Rule 0-11 (a) (2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

Amount Previously Paid:   None   Filing Party:   Not applicable
Form or Registration No.:   Not applicable   Date Filed:   Not applicable
ý
Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.
ý
third-party tender offer subject to Rule 14d-1.

o
issuer tender offer subject to Rule 13e-4.

o
going-private transaction subject to Rule 13e-3.

o
amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results of the tender offer: o




Items 1-11.

N/A

Item 12. Exhibits.

EX-99.1:    Transcript of conference call held by Companhia Vale do Rio Doce ("CVRD") on August 11, 2006.

EX-99.2:    Transcript of conference call held by CVRD on August 11, 2006.

EX-99.3:    Transcript of conference call held by CVRD on August 11, 2006.

EX-99.4:    Slide presentation of CVRD dated August 11, 2006.

Item 13.    Information Required by Schedule 13E-3.

N/A


EXHIBIT INDEX

EX-99.1:    Transcript of conference call held by CVRD on August 11, 2006.

EX-99.2:    Transcript of conference call held by CVRD on August 11, 2006.

EX-99.3:    Transcript of conference call held by CVRD on August 11, 2006.

EX-99.4:    Slide presentation of CVRD dated August 11, 2006.




QuickLinks

EXHIBIT INDEX