Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Gold/Mining/Energy : Montello Resources -- Ignore unavailable to you. Want to Upgrade?

To: JP who wrote (1830)	3/9/1998 11:04:00 PM
From: Jesse	Read Replies (1) \| Respond to of 4256

Hi JP -- another good question! On p.16 of AGS Bulletin No.63, "The Diamond Potential of Alberta" (1996, M.B.Dufresne et al.), the following is written about the bedrock & drift maps* -- (*note that "Figure 6" is the bedrock topography map, and "Figure 7" is the drift thickness map): ------------------ ------------------ "Bedrock surface contours range from about 1,200 m asl in the foothills to slightly more than 200 m asl near the margin of the Precambrian Shield (Figure 6). There are three basic topographic elements: (1) the broad generally northeastward and eastward trending valleys; (2) uplands underlain by erosional bedrock remnants; and (3) broad, relatively level interfluve areas. The valleys were primarily formed during preglacial time, as demonstrated by the presence of preglacial sediment at the base of the valley fill sequences. "Figure 7 shows the thickness of unconsolidated sediment overlying the bedrock in Alberta and includes sediment of both Late Tertiary and Quaternary age... "Figure 7 shows only the regional trends in drift thickness in Alberta, therefore, local variations in drift thickness render this map unsuitable for obtaining site specific information. The most prominent feature on Figure 7 is a broad northwest trending belt of thick sediment (>150m) across northern Alberta. In contrast, those areas where the sediment is thin or absent include the Swan Hills, Clear Hills, Milligan Hills, north-central and northeastern Alberta north of 58degreesN and most of the southern half of the province (Figures 5 and 7). In many areas, the preglacial channels have been substantially infilled with Late Tertiary to Quaternary sediments, levelling the local relief of the present day land surface. "Factors influencing sediment accumulations are: (1) preglacial valleys; (2) bedrock highlands, (3) areas of ice marginal still stands; and (4) bedrock contacts or scarps. The preglacial valleys also influenced later sedimentary deposition by: (1) acting as sediment traps; (2) influencing glacial dynamics; (3) forming lows favourable to the deposition of stratified sediment; and (4) preserving the existing sediment from erosion during subsequent glacial advances. Examples of these factors which have affected sediment accumulations, are presented in Dufresne et al. (1994b)." ------------------ ------------------ - - - - Doesn't exactly answer your question, but adds food for thought! Cheers, -j :>