NEW YORK, Dec. 22, 2025 (GLOBE NEWSWIRE) -- Sprott Asset Management USA, Inc., a wholly-owned subsidiary of Sprott Inc., today announced methodology changes to the index that Sprott Junior Gold Miners ETF (NYSE Arca: SGDJ) tracks. Junior gold miners, as measured by the Solactive Junior Gold Miners Custom Factors Index, returned more than 171% as of December 19, 2025. This extraordinary market appreciation of junior gold miners has led to an increase in market capitalization of the index constituents. To pre ...