4-Regular Vertex-Transitive Tilings of E^3 by Friedrichs O.D., Huson D.H.

By Friedrichs O.D., Huson D.H.

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Sampler (Fig. 15b) is small (150 to 300 g). It can be used for fine fraction till geochemistry but is not large enough for heavy mineral geochemical or Au grain studies. Laboratory methods TILL GEOCHEMISTRY AND SAMPLING METHODS IN SHIELD AREAS 37 Table 3. Association of elements in major types of mineral deposits Type of deposit Hydro thermal deposits Porphyry copper and/or molybdenum Ni-Cu-Fe sulphides VMS Native copper Precious metal Native silver and Ni-Co arsenides Polymetallic veins Iron formations Mercury Mississipi Valley Pb-Zn Skarn-iron (magnetite) deposits Skarn Cu-Zn-Pb deposits Skarn W-Mo-Sn deposits Magmatic deposits Pt-Ni-Cu rich intrusions Chromite ores Carbonatites Pegmatites Kimberlites (diamonds) Sedimentary types Copper shales Uranium vein Sandstone-type U Major components Cu, Mo, S Ni, Cu, S, Fe Fe, S, Cu, Zn Cu Au, Ag Co, Ni, Ag, S Pb, Zn, Cu, S Au, As, S Hg, S Zn, Pb, S Fe Fe, Cu, Pb, Zn W, Mo, Sn Pt, Ni, Cu Cr K, Na, Fe, P, F, Cl, Zr, Nb Be, Li, Cs, Rb Sr, Nb, Ba, Cr, Ni, Mg, Ca Cu, S U U Associated elements Fe, Ag, Au, REE Pt, Co, As, Au Cd, Hg, Au, Pb, As, Sb, Ba, Bi Ag, As, S Sb, As, Hg, Te, Se, S, U As, Sb, Bi, U Ag, Au, As, Sb, Mn Sb, Fe Sb, As Ba, F, Cd, Cu, Ni, Co, Hg Ti, Cu, Co, S Cd, S, Au, Ag, Cu, Co F, S, Cu, Be, Bi Cr, Co, S Ni, Fe, Mg Sr, Ti, Ta, U, REE B, U, Th, RE, Nb, Sc Al, K, Ta, Th, REE Ag, Zn, Pb, Co Mo, Pb, F Se, Mo, V, Cu, Pb Modified from Rose et al.

The management, analysis and display of exploration geochemical data. In: Exploration Geochemistry Workshop. Geological Survey of Canada, Open File 2390, 9-1-9-41. GEDDES, R. S. 1982. The Vixen Lake indicator train, northeastern Saskatchewan. In: DAVENPORT, P. H. ) Prospecting in Areas of Glaciated Terrain. Canadian Institute of Mining and Metallurgy, St. Johns, 264-283. GLEESON, C. F. & CORMIER, R. 1971. Evaluation by geochemistry of geophysical anomalies and geological targets using overburden sampling at depth.

For all drilling methods, till samples should be collected continuously over depth TILL GEOCHEMISTRY AND SAMPLING METHODS IN SHIELD AREAS 31 Fig. 9. Schematic cross-section of a reverse circulation rotary drill (modified from Averill 1990). intervals of 1 to 2m through entire till units because: (1) dispersal trains can be thin, forming discrete horizons, and till units can vary from one to tens of metres in thickness; (2) dispersal trains are not always in contact with the bedrock surface; and (3) corroboration by vertically adjacent samples is a key to confirming a geochemical anomaly (Geddes 1982; Averill 1990; McClenaghan 1994).

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