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Gold/Mining/Energy : Houston Lake Mining [HLM-ASE] -- Ignore unavailable to you. Want to Upgrade?

To: Paul Thomas who wrote (151)	3/30/1999 2:03:00 PM
From: DRT	Respond to of 364

Compare and contrast is a better term. Both are pegmatites of the same petalite sub-type as Tanco/rare metal mineralization. The Big Whopper does not appear to be zoned, its predominantly petalite and K-feldspar with low grade tantalum and cesium - a rare world-class deposit, no question. Field work, mapping, bulk samples, channel samples, etc. to date indicates that Pakeagama Lake has "strong internal zonation marked by an impressive spodumene+quartz core zone that represents replacement of original petalite", and most noteably higher grade Ta and Ce (the plot of K/Rb vs. Ce ppm is a measure of cesium exploration potential - indicates it compares more favourably with the Tanco pegmatite than the Big Whopper). DRT

To: Paul Thomas who wrote (151)	3/30/1999 8:42:00 PM
From: DRT	Read Replies (1) \| Respond to of 364

No question they differ: As noted from the 1999 OGS Open File Report, #169: "Rare-Metal Mineralization Associated with the Berens River-Sachigo Subprovincial Boundary, Northwestern Ontario: Discovery of a New Zone of Complex-Type, Petalite Subtype Pegmatite and Implications for Future Exploration" by F.W. Breaks, A.G Tindle, and S.R. Smith. Mineral Chemistry - "Potassium-feldspar chemistry has been well established as a useful tool in the economic valuation of pegmatites. In particular, the Rubidium (Rb) and cesium (Ce) contents and the K/Rb ratio in blocky potassium-feldspar are important in discriminating between rare-metal-enriched pegmatites and those that are barren of such metals." - 'Concentrations of rubidium (mean 1.11%) and cesium (mean 0.83%) are highly anomalous and indicative of a complex type pegmatite system. This assessment is supported by the K/Rb vs. Ce content, a plot useful in assessing economic potential, where most analyses (samples) from the Pakeagama Lake area plot witin the Bernic Lake pegmatite group ... which includes the Tanco Pegmatite'. From Table 24.5 Pegmatite Comparisons of Ce, Rb and K/Rb: # Ce (ppm) Rb (ppm) K/Rb Pakeagama Lake (HLM) 19 827 11100 9.5 Bernic Lake (TANCO) 57 1262 14800 9.5 Big Whopper (AVL) 5 249 12592 8.5 _____________ DRT