Inherited A Collection

The melt value of the $100 Year of Peace gold is about $788 CAD, so if a dealer is selling it for $825 CAD it tells you that its value is mostly based on its bullion value. A dealer would likely offer you less than $700 for the coin (potentially much less). The same would hold true for the 1982 Constitution $100 gold coins.

Regarding the silver dollars.Were they collected from circulation? If they were, the value is likely tied to their bullion value - currently about $12 CAD each. Coins in uncirculated grades, however, would be worth more; it's likely there is no one answer that covers all your silver dollar coins.

If the coins were collected from sets (and never circulated) they have a premium beyond their melt value. More details about the individual coins (and pictures) would be necessary before fully-accurate answers can be given.

It might make sense to take them to a local coin dealer and get their assessment - or to a local coin club meeting. I wouldn't sell anything to a dealer on the first trip, however. Use the first visit to learn more about the coins and then come back here and tell us what you've learned. It's likely we then will be able to give you better guidance.

and this is the most important part: