RE:Season end Drill season goes year round. It's a common misconception that they only drill during the spring, summer and fall. Drilling in some areas can only be done in the later winter as some areas (such as swamps) cannot be accessed for drilling if the ground is not frozen.
Here is a list of all permits in file with the registry for laurion.
https://ero.ontario.ca/search?search=Laurion+mineral+exploration+
You have to be quite specific with permits on exactly where you drill so it's possible some of these were filed and not executed on because other areas were shown to have more favourable results in terms of potential drill areas. Steve could prpwpbly elaborate more on this.