RE: RE: RE: Question for the board I read it and I prefer someone with more geology knowledge to shed more light on it. The June 28,2012 Barkervile Gold Mine new realease provides more information as per BGM.
GEOLOGY AND MINERALIZATION
The Project is underlain by the Barkerville Terrane which is part of the regional Omineca Belt of the Canadian Cordillera. The Barkerville Terrane is comprised of a late Proterozoic and/or early Paleozoic sequence of metamorphosed rocks that were deposited as continental shelf to slope marine clastic rocks along with lesser amounts of marine carbonate rocks and volcanic rocks adjacent to the craton of ancestral North America. The Barkerville Terrane is structurally the lowest exposed sequence and is more deformed and metamorphosed (lower greenschist facies) than adjacent terranes.
During the Cretaceous the rocks of the Barkerville Terrane were deep below the surface and subjected to an early period of ductile deformation that resulted in asymmetrical, overturned, isoclinal (both limbs and the axial planes dipping to the east) fold structures with the fold axes plunging shallow to the northwest. Major regional thrust faults, initiated in the post metamorphic period occur in the area, striking in a northerly direction and dipping to the east with over thrusting from east to west
Post-metamorphic upright, open folds with axial planes approximately east-west deformed the earlier period of folding such that the early fold axes now plunge to both the northwest and the southeast along the length of the Barkerville Terrane.
During the late Cretaceous to early Tertiary a major period of northwest trending dextral strike-slip faulting occurred with conjugate faults trending northwest and north, both with a significant normal component of movement. The north trending fault structures appear to be an important control for gold vein mineralization in the Wells area most of the gold mineralization was deposited at that time although it is possible that there was already earlier stage gold mineralization formed before and during the onset of metamorphism that was remobilized during the post metamorphic period.
Gold mineralization on the Property occurs as:
- Quartz veins located in shear-type and tension-type fractures in lithologies that are more brittle than the surrounding lithologies, and
- Disseminated sulphide zones (pyrite-pyrrhotite) localized in the nose of secondary, local fold structures that have the same north westerly plunge as the regional, orogeny related, asymmetrical, overturned, isoclinal (both limbs and the axial planes dipping to the east) fold structures.
Historic production is all in the vicinity of the three adjoining mountains; Island Mountain, Cow Mountain and Barkerville Mountain. Historic production is as follows:
Historic Lode Gold Production, Cariboo Gold District (Hall 1991)
| Mine | Tons Milled | Oz Au Produced |
| Island Mtn/Aurum (1934-67) | 1,245,295 | 569,526 |
| Mosquito (1980-83) | 103,146 | 34,281 |
| Cariboo Gold Qtz (1933-59) | 1,681,651 | 626,755 |
**Based upon 93% mill recovery; 95% mine recovery of resource; and 25% dilution
The mineralization is hosted primarily in the Rainbow Unit and may extend into the younger BC Unit or the older Baker Unit. Note that in the mine areas the stratigraphy is overturned due to folding and the Baker Unit is overlying the Rainbow Unit. At the time of the Cretaceous deformation, the Rainbow Unit had lower ductility than the adjoining units and intense brittle fracturing occurred that contains many quartz veins and disseminated sulphide zones (dominantly in the hinges of small amplitude folds). During the operating years of the historic mines many of the mineralized zones were too narrow to be mined economically.
In the immediate vicinity of the historic mines, the Rainbow Unit can be mapped along a strike length of approximately 8 km (5 miles) and has been traced at least another 16 km (10 miles) to the south into the Cunningham Creek area.
The regional stratigraphy within which the Rainbow Unit occurs has been mapped to the Cariboo Lake area, 32 km (20 miles) to the south of Barkerville Mountain.