SLW bought about 10-11% of the float in 2007. They could have bought or sold more shares since. Maybe they are starting to accumulate a bigger stake? They have plenty of $$$ to do it with nowadays! See old press release below:
Mines Management Announces Completion of US $10 Million Private Placement with Silver Wheaton November 05 , 2007 Press Release 07-11 Spokane, Washington – November 5, 2007 – Mines Management, Inc. (AMEX: MGN, TSX: MGT) (the "Company") is pleased to announce it has completed a US$10 million private placement of its common stock to Silver Wheaton Corp. (TSX, NYSE: SLW). The transaction provided for the issuance of 2.5 million shares at a price of US$4.00 per share (the "Shares").
The Company intends to use the proceeds of the transaction for working capital and general corporate purposes, including the further advancement of the Montanore Project and for potential acquisitions.
In connection with the private placement, the Company has granted to Silver Wheaton a twenty-year right of first refusal to purchase any silver stream that the Company elects to sell from its Montana properties.