The property was sold in 1996 to Westmin Resources which closed the mine in 1998.

In July 1999, Taseko Mines purchased Gibraltar and re-opened it in October 2004, taking over operations in 2006.

The concentrator capacity was increased from 36,750 to 46,000 tonnes per day (tpd) at a cost of $76 million.

The phase II expansion – which began in May 2007 – saw the concentrator capacity increased from 46,000 to 55,000 tpd in a semi-autogenous grinding mill at a cost of $40 million.

The mine went through addition upgrades during a third development phase which cost $325 million, increasing the design capacity of Gibraltar to 85,000 tpd.