Sunshine Silver Mining & Refining Co. filed for a US initial public offering, and is seeking funds to restart a mine in Idaho that previously produced silver, antimony and other minerals.

The owner and developer of the Sunshine mine and other facilities had a net loss of $13.3 million on no revenue in the three months ended March 31, 2025, compared with a net loss of $2.9 million in the same period a year earlier, according to its filing Monday with the US Securities and Exchange Commission.