On a mountain, that's easy, they load it up with supplies that need to be transported to the top, or cargo that needs to come back down.
There's probably a hut, or shack, or first aid, or who knows what - maybe a food vendor near the top of that lift. Something that uses some type of consumable good. Where it needs to be replenished more often than once a year. They probably stop the line to merge it in. From the picture, I would bet they stop the line to pull it out and leave a gap on the line that get's filled in at the bottom. Then, send up a gap, stop the line and insert the basket for the trip back down.
I can picture anything from first aid supplies going up and the garbage packaging going back down to a coffee and hot chocolate stand with food and propane going up and garbage and empty propane tanks going back down.
Way easier than loading supplies on a snow cat every week or day.
If the thing at the top only needed to be supplied once a year, they might haul stuff up before the snow falls instead.