score:0
So, to answer this question from my own experience (September 2018):
The largest locker was slightly too small for our 80 x 50 x 30 cm suitcase (along the 50 cm dimension), so we had to wheel it around with us anyway. However that didn't stop us from going on the LKAB mine tour, as the tour bus driver was happy to stow the case in the bus's luggage compartment.
Upvote:1
According to the tourist information, there are luggage lockers at the train station:
The station building is handicap-friendly and there are lockers where you can store your luggage. It is unmanned and no vending machine or supermarket nearby.
I can't find any opening hours for the station itself, but I would be very surprised if the waiting room is not open during normal traffic hours.