On February 1, 2024, Canadian Copper Inc. announced that it satisfied all conditions required to acquire 100% of the Murray Brook deposit and its surrounding prospective exploration property.
- subscription is required.
Summary:
Deposit Type
The Murray Brook sulphide mineralization is classified as a volcanogenic massive sulphide (“VMS”) deposit hosted in sedimentary rocks. VMS deposits are well studied and documented, and a major global source of Zn, Pb, Cu, Ag and Au and other metals (Galley, 2007; Franklin, 2007; Shanks et al., 2009). Although VMS deposits tend to be hosted volcanic rocks, some of those in the BMC are hosted in sedimentary rocks proximal to felsic volcanic-sedimentary interfaces (Franklin et al., 1981). However, at Murray Brook and elsewhere in the BMC, the original depositional and stratigraphic relationships are obscured by the overprinting effects of post-depositional metamorphism and polyphase deformation.
Mineralization
The Murray Brook Deposit is hosted by sedimentary rocks of the Charlotte Brook Member in the lower part of the Mount Brittain Formation. The upper felsic volcanic member of the Mount Brittain Formation hosts the Restigouche Deposit, 10 km to the west of Murray Brook. The Mount Brittain Formation is considered to be equivalent of the Spruce Lake Formation, which hosts the Caribou Mine, 10 km to the east.
The Murray Brook Deposit is elliptical in plan with a strike length of approximately 350 m and a maximum thickness of up to 100 m. The Deposit dips approximately 40° to the northwest with a dip extent of >350 m. It plunges moderately to the north and appears to pinch-out at depth and to the east. The geometry of the Deposit was probably lens-shaped, but the up-dip portion of the body has been eroded and pre-Pleistocene weathering produced the gossan that was historically mined for silver and gold.
Structurally, the massive sulphides occupy the core of an F1/F2 synform (sheath fold) that is deformed by F3 folds, such that the hanging wall footwall are part of the same unit. Although the Murray Brook Deposit is a single body of massive sulphide with good continuity, in-fill drilling indicates that it consists of two connected lenses or lobes. The western, deeper lobe is richer in zinc and lead and the eastern, shallower lobe richer in copper. Given that zoned VMS deposits tend consist of Cu-rich lower zones and Zn-Pb rich upper zones, it appears possible that the Murray Brook Deposit may be overturned.
The Murray Brook Deposit is enclosed in a 1 to 3 m wide halo of chloritized sedimentary rocks containing disseminated pyrite. The hanging wall is moderately chloritic and locally intensely deformed. The footwall consists of fine grained-felsic tuff, and tuffaceous sedimentary rocks with moderate to strong chlorite and sericite alteration.
The Murray Brook Deposit sulphides are massive to semi-massive, locally banded, and pyrite rich. The sulphides are mainly fine grained, massive, weakly laminated pyrite with disseminated and banded sphalerite, chalcopyrite and galena, and minor tetrahedrite, covellite, marcasite and arsenopyrite.