After reading the helpful response you've obtained from Responder 4867175, I also tried to see if I could find an obituary in the Toronto Star that would tell where Eugene Coste is buried, as contacting them to see if his wife is also there you could likely obtain either a death or burial date. I did not have luck just by searching, but looked at the section where all the death notices are given. There is a notice for him on Jan. 24th & 25th. All the type is very broken,so likely why Search did not pick those up. I could not read the name of the cemetery in Jan 24th notice. But in Jan 25th notice, it says his interment was to be at Mount Hope cemetery. From the following website it appears to be one of a number of Catholic cemeteries in Toronto: http://www.catholic-cemeteries.com/contact_us.html
There is on that website page a link to find the e-mail address of the Main office for all the Catholic cemeteries in Toronto, which looks to be:firstname.lastname@example.org
It says on any inquiry to mention the name of the cemetery of concern. They also give the address and phone number for the main office; also a Toll-free number: 1-800-974-4619.
If you want to contact the Mount Hope Cemetery direct, the following is given for it:
Mount Hope Cemetery
305 Erskine Avenue