EXHIBIT 23.3
CONSENT OF ENGINEERS
[Letterhead of Watts, Griffis and McOuat]
We hereby consent to the use of our names in connection with the following report which is incorporated by reference into the registration statement on Form S-8 of Silver Wheaton Corp. (formerly Chap Mercantile Inc.) being filed with United States Securities and Exchange Commission:
“A Technical Review of the Zinkgruvan Mine in South-Central Sweden for Silver Wheaton Corp.” dated December 13, 2004.
Dated: August 22, 2005
/s/ John R. Sullivan, P.Geo.
John R. Sullivan, P.Geo.
Senior Geologist
/s/ G. Ross MacFarlane, P.Eng.
G. Ross MacFarlane, P.Eng.
Senior Associate Metallurgical Engineer