By Agence France-Presse
Five injured workers at the Rudna mine in the southwestern town of Polkowice were taken to hospital but their lives were not in danger, a KGHM spokesperson, Anna Osadczuk told AFP.
"Two bodies have been recovered and the searches continue," she said.
The magnitude 4.4 quake struck deep underground on Tuesday evening near the town of Glogow, the US Geological Survey said.
One of the largest copper mines in the world, the Rudna mine has 11 operating shafts at a depth of around one kilometre (half a mile).
It employs 4,400 people and extracts around 12 million tonnes of minerals a year.