Quartz arenites Dolomitic sandstones(?)
Virtual Museum ID: 19-BCGS-Crowsnest-1
Quartz arenites or quartzarenite is a sandstone comprised of >90-95% detrital quartz. Monocrystalline sand-sized quartz grains held together by cement precipitated into pore space.
Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate. The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite. An alternative name sometimes used for the dolomitic rock type is dolostone.
The information listed below relates to the current holding location or collection that the sample is from, and whether the item is viewable at that location or is part of a private collection. Coordinates are given as guides, and we remind you that collecting specimens from these locations is not allowed. Caution is advised visiting such sites and Below BC assumes no responsibility for any injuries or trespassing charges that may occur as a result of the viewer entering these sites.
Original Collection:British Columbia Geological Survey (BCGS)
Virtual Museum ID:19-BCGS-Crowsnest-1
Date Added to VM:2019-05-07
Sample Origin:54km SE of Fernie, B.C.
Specific Site:Crowsnest Property
Datum:11 (NAD 83)
Primary Features:Quartz arenites Dolomitic sandstones(?)
Primary Mineral Formula:SiO2 · CaMg(CO3)2
Primary Category:oxide carbonate
Advanced Geological Information
The following section provides geological data relating to the specimen or the site it was collected from, when available. Information has been obtained from various sources including private and government datasets but may not be up to date. Any geological time periods or ages listed often relate to the primary geology of the area, and may not be the actual date of an event such as mineral formation.
Geological Formation:Rundle Group(Mount Head and Livingstone formations)
Stratigraphic Age:358.9 - 323.2 Ma
Geological Terrane:Overlap Assemblage
The Crowsnest property is located on a ridge seperating Howell Creek and the Flathead River, approximately 54 kilometres south east of Fernie.
The area is underlain by a thick series of limestones, dolomites and black shales of the Upper Devonian Palliser Formation, Mississippian Rundle Group (Livingstone, Mount Head and Etherington formations), Lower Mississippian Banff Formation and Upper Devonian-Lower Mississippian Exshaw Formation. Quartz arenites and dolomitic sandstones of the Permo-Pennsylvanian Rocky Mountain Group also occur. Numerous small Cretaceous stocks of trachyte and syenite composition have intruded and locally altered the enclosing sedimentary strata.
The mineralization (pyrite) occurs within a syenite stock which is enclosed by coarse crystalline, skeletal calcarenites of the Mount Head and Livingstone formations. Within these rocks, an aureole of coarse equigranular marble has been developed for a distance of about 100 metres around the stock. Small bodies of calc-silicate skarn were also found along the contact with the stock.
In 1969, mineral claims were staked in the Howell Creek watershed but no assessment work was filed. In 1984, Dome Exploration Canada Ltd conducted geological mapping and sampling which resulted in staking of 12 claims. In 1985, the “A”, “B”, “C” geochemical grids were located in close proximity to Fortress Peak. This led to the discovery of a calc-silicate vein on the “A” grid which yielded a geochemical analysis of 1.5 grams per tonne gold and 2.3 per cent zinc. In 1986, the “D”, “E”, “F” grids, were located 0.5-3.5 km north and northwest of Fortress Peak, which led to the discovery of elevated copper values on the “E” grid.
In 1987-88, Dome Exploration focused on the “A” grid (on the Crow 6), which included geological mapping, trenching, and diamond drilling. The best intersection was 7.58 grams per tonne gold over 1.5 metres; trenching resulted in a rock chip grab sample returning an assay value of 36.6 grams per tonne gold (Assessment Report 27041).
In 1989, six diamond drill holes totaling 886 metres were completed by Dome along the southern border of the “B” grid. Drilling encountered a sequence of carbonate and shale with several intervals of syenite, but failed to identify elevated gold
In 1998-99, Eastfield Resources Ltd/Intemational Currator optioned the Flat claims and commenced staking the 86 unit Crow l-9 claims. Eastfield completed a detailed follow-up on the area of the “B” and “K” grids. The fieldwork included IP geophysics, geochemical soil sampling, trenching and diamond drilling on the Flat 1 claim. The IP survey showed a north-south trending chargeability increase located 200-400 metres north of Fortress Peak. In 1999, trench TK99-1 on the Crowsnest property exposed a mineralized zone associated with a syenite dyke that cuts limestone. The zone assayed 8.57 grams per tonne gold over 16 metres (Exploration and Mining in BC 2003, page 43). Located 100-200 m north of Fortress Peak, this positive chargeability IP feature appears to trend east-west. A total of 10 diamond drill holes were carried out. No economic concentrations of gold were outlined in any of the drill holes.
In 2002, Goldrea Resources Ltd. entered into an agreement to earn a 55% interest in one or both of the Crowsnest and Howell (082GSE037) gold properties from Eastfield Resources Ltd. In 2002 Goldrea drilled 660 metres in 11 holes in the area around and south of TK99-1. The third hole of the program (DDH-02-03), which is 200 metres south of TK99-1, intersected 42.5 metres of 0.40 grams per tonne gold including a 12 metre interval with 1.05 grams per tonne gold and a 3 metre interval grading 2.62 grams per tonne gold (Exploration and Mining in BC 2003, page 43). Mineralization is hosted in strongly altered monzonite/syenite and limestone.
In 2003, Goldrea carried out a prospecting and sampling program on the property during the summer, then returned in the fall to conduct a 5 hole 477 metre drill program. Four of the holes were completed in the area south of trench TK99-1 and one further to the east to test a geochemical anomaly. The gold values were significantly lower than the previous year but silver up to 240 grams per tonne across 3.35 metres was reported ((Exploration and Mining in BC 2003, page 43).
In 2004, Eastfield optioned the Crowsnest to La Quinta Resources Corporation who carried out exploration programs in 2005 and 2006.
In 2009, Eastfield optioned the Crowsnest property to Max Resource Corp who carried out a trenching, sampling, and reverse-circulation drill program. New trenches extended the mineralized zone 200 metres to the west of the discovery trench and one sample returned a grade of 104 grams per tonne gold. The drill program consisted of 26 holes totalling 799 metres. Hole RC 09-7 returned a grade of 19.03 grams per tonne gold over 6.1 metres (http://www.maxresource.com).