EXHIBIT 23.4
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 Tayoltita, Santa Rita, San Antonio, and San Martin Mines as of August 31, 2004 for Chap Mercantile Inc.” dated November 9, 2004.
Dated: August 22, 2005
/s/ Velasquez Spring, P.Eng.
Velasquez Spring, P.Eng.
Senior Geologist
/s/ G. Ross MacFarlane, P.Eng.
G. Ross MacFarlane, P.Eng.
Senior Associate Operations Engineer
/s/ Gordon Watts, P.Eng.
Gordon Watts, P.Eng.
Senior Associate Mineral Economist