Worth Holding?

I will try to give you a "rough" idea for each of our Canadian coins (Canadians are friendly, eh?):

One cent => 1858 to 1942 (95% Cu)
One cent => 1943 to 1996 (98% Cu)
One cent => 1997 to date (copper covered zinc, and/or copper covered steel => magnetic)

Five cents => 1870 to 1921 (93% Ag and 7% Cu)
Five cents => 1922 to 1952 (100% Ni)
Five cents => 1953 & 1954 (Nickel plated steel)
Five cents => 1955 to 1981 (100% Ni)
Five cents => 1982 to 1999 (75% Cu and 25% Ni)
Five cents => 2000 to 2011 (Cu/Ni plated steel)

Ten cents => 1870 to 1936 (93% Ag and 7% Cu)
Ten cents => 1937 to 1967 (80% Ag and 20% Cu)
Ten cents => 1968 (50% Ag and 50% Cu)
Ten cents => 1969 to 2000 (100% Ni)
Ten cents => 2001 to 2011 (Cu/Ni plated steel)

Twenty Five cents => 1870 to 1919 (93% Ag and 7% Cu)
Twenty Five cents => 1920 to 1967 (80% Ag and 20% Cu)
Twenty Five cents => 1968 (50% Ag and 50% Cu ... or 100% Ni)
Twenty Five cents => 1969 to 2000 (100% Ni)
Twenty Five cents => 2001 to 2011 (Cu/Ni plated steel)

Fifty cents => is pretty-much identical to the 25 cents' in composition

Silver Dollars => 1935 to 1967 (80% Ag and 20% Cu)
Silver Dollars => 1968 to 1986 (100% Ni)

..... and then the "Loonie" arrived in 1987 and the rest is history (Toonie came in 1996)
That's all I got

Nicely done Stevex6! That is quite the summary. I agree with your statement about pre 2000 as well.