From the Canadian mint
http://www.mint.ca/store/mint/learn/5-cents-53000061922 to 1942
Composition: 99% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1942 to 1943
Composition: 88% copper, 12% zinc n
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1944 to 1945
Composition: chrome plated steel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1946 to 1951
Composition: 99.9% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1951 to 1954
Composition: chrome plated steel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1955 to 1981
Composition: 99.9% nickel
Weight (g): 4.54
Diameter (mm): 21.21
Thickness (mm): 1.7
1982 to 1999
Composition: 75% copper, 25% nickel
Weight (g): 4.6
Diameter (mm): 21.2
Thickness (mm): 1.76
2000 to date
Composition: 94.5% steel, 3.5% copper, 2% nickel plating
Weight (g): 3.95
Diameter (mm): 21.2
Thickness (mm): 1.76
So no silver for Canada for the war just (tombac)