Twin Creeks is an open-pit mine, owned and operated by Nevada Gold Mines LLC, a joint venture between Barrick
Gold Corporation (Barrick) (61.5%) and Newmont Corporation (Newmont) (38.5%). Twin Creeks is located in Humboldt
County, Nevada, approximately 125 kilometers northwest of Elko. Under the joint venture, Barrick’s Turquoise
Ridge Mine and Newmont’s Twin Creeks Complex were combined as a single operation, now known as Turquoise Ridge.
Turquoise Ridge Surface (Newmont’s former Twin Creeks property) was created in 1993 by the consolidation of the
Rabbit Creek Mine and the Chimney Creek Mine. The former Rabbit Creek Mine is located in the south-end of the
property, including what is now known as Mega Pit. The former Chimney Creek Mine included the northern portion
of the Mega Pit, the Vista Pit, and Vista Underground, which is located in the north-end of the property near
the Sage autoclave and Juniper oxide mill.
Turquoise Ridge Surface operates the Vista and Mega pits, as well as providing ore rehandle and surface project
work at Turquoise Ridge Underground. Turquoise Ridge Surface uses conventional open-pit mining methods including
drilling, blasting, loading, and hauling. The current planned mining rate for Turquoise Ridge Surface is 71,000
tonnes of ore per day.
Run-of-mine (ROM) higher grade oxide ore from the Turquoise Ridge Surface sources are blended for gold grade,
hardness, and carbonate content and fed to the Juniper Mill. ROM lower grade oxide ore from the Turquoise Ridge
Surface sources are delivered to the Juniper heap leach pads.