This is by license only, so can't say for sure this is where they are. But it's a start.
WQWD699 - Purity Spring Resort
WPUK580 - Purity Spring Resort
King Pine Purity Spring Resort
Also they may utilize National Ski Patrol frequencies including 155.160, 155.205, 155.220, etc.
Hopefully, those will pan out.
Those could be other users on the frequencies too. Plus terrain doesn't always help. But hopefully, you'll be able to catch some stuff eventually.