Why a giant sinkhole appeared at a mining site in Arctic Sweden

A large sinkhole appeared on Wednesday about half a kilometer from the edge of a nearby town but company officials says its not a danger to residents.
Malmberget in the far north is the site of a centuries old iron ore mine and officials at the mining company LKAB say the sinkhole was likely to appear at some point in time. Though they added it arrived earlier than expected.
Hear LKAB’s spokesman Anders Lindberg explain what caused the opening and how the company is handling it.
Related stories from around the North:
Canada: Moody’s downgrades rating on $550M bond owed by Northern Canada mines owner, CBC News
Finland: Mining companies to pay higher deposits for environmental damage in Finland, Yle News
Greenland: Greenland issues new exploration, prospecting licences to Anglo American, Eye on the Arctic
Norway: Minister downplays environmental impact of planned mine in Arctic Norway, The Independent Barents Observer
Russia: Moscow supports Vostok Coal’s expansion into protected Arctic tundra, The Independent Barents Observer
Sweden: Mining company LKAB won’t pay for earthquake damage to homes in Arctic Sweden, Radio Sweden
United States: Fight over contested Alaska mine project aired at US House hearing, Alaska Public Media