Spanish Mountain, Likely, Cariboo Mining Division, British Columbia, Canada
|Latitude & Longitude (WGS84):||52° 35' 17'' North , 121° 27' 16'' West|
|Latitude & Longitude (decimal):||52.58833,-121.45472|
|Köppen climate type:||Dfc : Subarctic climate|
The region is underlain by Upper Triassic metasedimentary rocks with some intercalated volcanics of the basal part of the Nicola Group. This
sequence is overlain to the west by alkali basalt and alkali olivine basalt. The metasedimentary rocks consist of slaty to phyllitic, dark grey to black shale and siltstone and dark brown to black-weathering grey limestone and, increasing in amount up section, banded tuff, volcanic breccia and local pillow lavas.
These rocks have been folded initially about northwest trending axes and then refolded about axes subparallel to those of F1 folds at the mesoscopic scale. Whereas F1 folds have an accompanying penetrative fabric, deformation associated with F2 folding was essentially nonpenetrative, manifested as crenulation and fracture cleavages. A third phase of deformation unaccompanied by folding is recognized as easterly striking, steeply dipping fractures. Northeast directed thrust faults occur at the base of the metasedimentary assemblage and possibly within the assemblage. These faults probably formed at the same time as F1 folds and are deformed during F2 folding. Northeast striking, steeply dipping normal faults cut the volcanic terrane to the west and appear to have cut the eastern metasedimentary rocks in some areas.
The geology of the CPW deposit is typical of the metasedimentary assemblage. Dark grey siltstone and shale has been folded along northwest striking axes, in places isoclinally. Intercalated lenses of highly siliceous (probably rhyolitic) tuff occur within the sequence. Felsic porphyry dikes and sills also occur.
Gold mineralization with associated base metals occurs within quartz veins. The veins formed during and after deformation along the limbs and
localized within hinge regions of mesoscopic folds. There is a suggestion that these quartz veins are also fault or shear-controlled. Mineralization
consists of coarse gold, galena, sphalerite, chalcopyrite, tetrahedrite and pyrite with quartz, mariposite and ankerite gangue. Gold also occurs in limonitic pseudomorphs after pyrite within siltstone. Coarse gold visible in some quartz veins may be the product of supergene enrichment. Drilling results indicate that gold mineralization in the quartz veins is discontinuous or in podiform shoots. The veins are generally narrow but can be up to 4 metres wide. The quartz veins also cut felsic porphyry. Several zones of oxidized material, containing a small amount of reserves, have been identified and tested.
Lode gold on Spanish Mountain was discovered by two prospectors in 1933. Exploration and mining on the prop¬erty have been sporadic since then. Names associated with the property include Spanish Mountain, Mariner II, CPW, Max, El Toro, Mount Calvery, Madre, Main, El, and Joe; some of these refer to zones on the property. Mineralization consists of gold, galena, sphalerite, chalcopyrite, tetrahedrite, and pyrite, with quartz, “mariposite,” and ankerite gangue in veins hosted by phyllite metasedimentary rocks. Gold also occurs in limonitic pseudomorphs after pyrite within siltstone. The quartz veins also cut felsic porphyry. Several zones of oxidized material containing a small amount of reserves have been identified. Microcrystals of octahedral gold, some with a rounded modification on the edges, have been found in vugs in the quartz.
It is interesting to note that the only confirmed gold crystals from lode deposits on Spanish Mountain are microcrystals, whereas one of the largest single crystals recovered in British Columbia came from the McKeown placer workings
Mineral ListMineral list contains entries from the region specified including sub-localities
9 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Late Triassic - Middle Triassic|
201.3 - 247.2 Ma
Age: Triassic (201.3 - 247.2 Ma)
Stratigraphic Name: Nicola Group
Comments: Logan J.M., Schiaizza P., Struik L.C., Barnett C., Nelson J.L., Kowalczyk P., Ferri F., Miihalynuk M.G., Thosmas M.D., Gammon P., Lett R., Jackaman W. and Ferbey T., 2010, 2010: Bedrock Geology of the QUEST map area, central British Columbia, GM 2010-1,
Reference: B.C. Geological Survey. British Columbia Digital Geology. 
Localities in this Region
- British Columbia
- Cariboo Mining Division
- Spanish Mountain
- Cariboo Mining Division