Yukon

The lignite deposits of North Dakota and Montana extend into Canada as far as Saskatchewan. Canadian deposits are also located in Alberta, Yukon, the Northwest Territories, Ontario, and Manitoba. Production by open-cast mining, ca3.5 x 10 t in 1975, was 10.8 x 10 t in 1989. 

The mink Mustela vision) is a piscivorous mammal that also has been exposed to relatively high dietary levels of methyl mercury in North America in recent times. In a Canadian study, mink trapped in Yukon territory, Ontario, and Nova Scotia were analyzed for levels of mercury and abundance of muscarinic, cholinergic and dopaminergic receptors in the brain (Basu et al. 2005). A correlation was found between total Hg levels and abundance of muscarinic receptors, but a negative correlation was found between total Hg and abundance of dopaminergic receptors. Thus, it was suggested that environmentally relevant concentrations of Hg (much of it in methyl form) may alter neurochemical function. The highest levels of mercury contamination were found in mink from Nova Scotia that had a mean concentration of total Hg of 5.7 pg/g in brain, 90% of which was methyl mercury. 

Gamberg, M. and A.M. Scheuhammer. 1994. Cadmium in caribou and muskoxen from the Canadian Yukon and Northwest Territories. Science of the Total Environment 143 221-234. 

Kidd, K.A., J.E. Earner, and D.C.G. Muir. 1993. Spatial variability of chlorinated bomanes (toxaphene) in fishes from Yukon lakes. Chemosphere 27 1975-1986. 

Day, S.J., Hope, G., Kuit, W. 1997. Waste rock management planning for the Kudz Ze Kayah project, Yukon Territory 1. Predictive Static and Kinetic Test Work. Proceedings of the 4th International Conference on Acid Rock Drainage. Vancouver, I, 81-98. 

Diavik Diamond Mine (Northwest Territories, Canada). Data from these active mines are compared to similar data from two closed chrysotile mines at Clinton Creek (Yukon, Canada) and Cassiar (British Columbia, Canada) as reported by Wilson et al. (2006, 2009). 

The regional-based survey pattern of the GSC-determined Hg concentrations (ppb) in stream sediments across Canada is shown in Fig.1. Of particular interest are (i) the high Hg concentration cluster near the central north-eastern border of the Yukon Territory (Survey Zone 3), (ii) the somewhat elevated background levels in the southern portions of the Canadian Shield along the Great Lakes, (iii) the scattered pattern of similar values throughout British Columbia, Labrador and... 

There are no effective boundaries when it comes to pollutants. Studies have shown that toxic insecticides that have been banned in many countries are riding the wind from countries where they remain legal. Compounds such as DDT and toxaphene have been found in remote places like the Yukon and other Arctic regions. 

Figure 14.19 Typical automotive applications made from glass-filled recycled PET compounds (a) heating and air conditioning door duct vents for Ford s Taurus, Mercury Sable and Lincoln Continental models (b) engine covers for Ford vehicles (c) fixed window surround for the Ford Excursion model (d) headlamp retainer for GM s Montana, Yukon and Sierra trucks...

Figure 11.28 shows the rhenium and osmium isotopic compositions of black shales and sulfide ores from the Yukon Territory (Horan et al., 1994). The black shale and sulfide layers are approximately isochronous. The superimposed reference isochrons bracket the depositional age of the enclosing shales. One reference line represents the minimum age (367 Ma) with an initial ( Os/ Os)q ratio of one, consistent with the mantle isotopic composition at that age (see later). The other reference isochron is drawn for a maximum age of 380 Ma, with ( 870s/ 860s)o = 12 (the maximum value measured in terrigenous sediments). Further examples of application of Re-Os dating of sediments can be found in Ravizza and Turekian (1989). 

Figure 11.28 Re-Os isochron for black shales and sulfide deposits of Yukon Territory (Canada). Reprinted from M. F. Horan et ah, Geochimica et Cosmochimica Acta, 58, 257-265, copyright 1994, with kind permission from Elsevier Science Ltd., The Boulevard, Langford Lane, Kidlington 0X5 1GB, UK.

Horan M. E, Morgan J. W, Grauch R. I., Coveney R. M. Jr., Murowchick J. B., and Hulbert L. J. (1994). Rhenium and osmium isotopes in black shales and Ni-Mo-PGE-rich sulfide layers, Yukon Territory, Canada, and Hunan and Guizhou provinces, China. Geochim. Cosmochim. Acta, 58 257-265. 

Spatio-temporal geochemical dynamics of an acid rock drainage stream in the Yukon Territory implications for mineral exploration... 

Keywords SEDEX deposit, Yukon Territory, acid rock drainage, mineral exploration vectors, groundwater. 

Pass (XY) Zn-Pb deposit and Nor Zn-Pb-Ba occurrence, Selwyn basin, Yukon and Northwest Territories, Geological Survey of Canada, Open File 845, p. 12. 

Goodfellow, W.D., Jonasson, I.R. Morganti, J.M. 1983. Zonation of chalcophile elements about the Howard s Pass (XY) Zn-Pb deposit, Selwyn Basin, Yukon. Journai of Geochemicai Expioration, 19 503-542. 

Morganti, J.M. 1979. The geology and ore deposits of the Howards Pass area, Yukon and Northwest Territories the origin of basinai sedimentary stratiform sulphide deposits. Ph D. thesis, University of British Columbia. 

Soil mineralogy and geochemistry of surficial materials around the XY base-metal massive sulfide deposit, Selwyn Basin, Yukon... 

KEYWORDS soil sampling mineral exploration, partial, leach, base metals, Yukon... 

The Selwyn Basin in the Yukon Territory of Canada hosts major SEDEX Zn-Pb sulphide deposits, the biggest being the relatively large ( 90.4 Mt) deposits at Howard s Pass Y), owned by Selwyn Resources (Morganti 1979 Goodfellow 2004). This research focuses on the surficial geochemical expression of the XY deposit, one of the 13 known orebodies within the Howards Pass district. 

This research investigated the soil geochemistry over the XY deposit, Howard s Pass, Yukon Territory, using a hydroxylamine partial leach protocol. In this case study ... 

Morganti, J.M. (1983). Zonation of chalcofile elements about the Howard s Pass (XY) Zn-Pb deposit, Selwyn Basin. Journal of Geochemical Exploration, 19, 503-542. Mann, A.W., Birrell, R.D., Mann, A.T., Humphreys, D. B., Perdrix, J.L (1998). Application of the mobile metal ion technique to routine geochemical exploration. Journal of Geochemical Exploration, 61 87-102. Morganti, J. M. (1979). The geology and ore deposits of the Howards Pass Area, Yukon and Northwest Territories the origin of basinal sedimentary stratiform sulphide deposits. Unpublished PhD thesis, University of British Columbia. 

Shanks, W.C., III, Woodruff, L.G., Jilson, G.A., Jennings, D.S., Modene, J.S., Ryan, B.D. 1987. Sulfur and lead isotope studies of stratiform Zn-Pb-Ag deposits. Anvil Range, Yukon Basinal brine exhalation and anoxic bottom-water mixing. Economic Geology, 82, 600-634. 

Petrogenesis of dykes related to Cu-Au base-metal Au-Ag occurrences, Mt. Freegold area, Dawson Range, Yukon Territory,... 

Fig.l. Location and geology of the Dawson Range, Yukon, and NFR claim boundaries (after Pautler 2006). 

---