The Boroo gold deposit is a low silica Au+As sulphide system associated with a zone of quartz-sericite-pyrite (QSP) alteration in the sub horizontal Boroo fault. Boroo is a intrusion-related gold deposit and hosted by a Cambrian-Ordovician sequence of highly deformed shales, siltstones and fine sandstones of the Haraa turbidite sediments, and the Paleozoic granitoids of the Boroo Complex.

The bulk mineable gold mineralization at Boroo is hosted in a strongly quartz sericite altered and sulfidized nearly flat lying zone controlled by the Boroo fault. The fault has been traced for a distance of 2.4 km and is thought to be a thrust fault that dips at an angle of 10° to the north west and trending north east. It cuts across the intrusive contact between sediments and granitic rocks in the north, but is entirely contained within the sediments in the south.

In the cross section, the Boroo fault shows a slightly undulated shape with the structure becoming thicker to the northwest, where the alteration and mineralization decrease. The Boroo fault is variously altered and mineralized, and where these features are strongest, individual deposits are formed. These are termed, from north to south, Pit 2, 3, 5 and 6. All of the deposits are elongated in a northeasterly direction, with a length to width ratio of about two to one. In Pit 2, 5 and 6, mineralisation is controlled by Boroo fault and is in the foot wall. But in Pit 3, there is low grade mineralisation in b ........

Boroo Gold Mine is a conventional open pit mine started in 2003 and located in north central Mongolia, Selenge Province in Bayangol and Mandal counties (known as soum in Mongolia) approximately 140 kilometers (km) northeast of the capital Ulaanbaatar.

The BGM operation uses ores from existing and extended open pit hard rock deposits, including the satellite Ulaanbulag pit, as well as placer deposits located within the BGM concession area.

- subscription is required.