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Gold/Mining/Energy : Gold Price Monitor -- Ignore unavailable to you. Want to Upgrade?

To: d:oug who wrote (89860)	9/21/2002 8:06:28 AM
From: E. Charters	Respond to of 116836

The mineral I like is Cummingtonite. If you get too much into the sedentary schizo wackes it is a danger to be sure. Trying to micromap a phreatohebephrenic mylonite with an anastomosing shear pantiline could ruin one's day without the utilization of diazepam. A number of geologists who tried to map crystal tuffs on the lee side of Mount St. Helens got far too absorbed in their work.

To: d:oug who wrote (89860)	9/21/2002 8:44:28 AM
From: E. Charters	Read Replies (1) \| Respond to of 116836

There are very few gold deposits in greywacke. Pronounced "gray-wackey". Wackes are rocks formed from erosion of other mixed rocks into mixed-up poorly sorted clasts or sharply broken bits that settle underwater. Wackes can form slaty beds. Most gold deposits in Canada are either in granite, syenite, oxide iron formation or more commonly volcanic sedimentary tuff contacting underwater pillowed lava flows and quartz feldspar porphyry. A tuff (pronounced "toof") is made up of fine dusty rock fragements from sub millimetre to several millimetres in size that are blown out of volcano in a violent eruption. They may fall anywhere from 1 to 150 miles or more from the volcano. Tuffs are the most common volcanic rock and some tuff beds cover 100's of square miles. They form very fertile soils before they become consolidated rocks, and for this reason, areas of Italy, Mexico, Kansas, and Iceland have very rich farming within the sight of or paleoproximity to volcanoes. Although gold is associated with volcanic action, it is almost always found at the contact or in the sedimentary bands of rock of the area. The volcanic rocks seem to separate, probably by gravity into quartzose and light coloured rocks, including quartz itself and heavier rocks that are dark coloured and contain larger amounts of iron. A sure sign of gold deposition is the presence of quartz veining in mafic iron rich sedimentary rocks or volcanic rocks in an area that has seen intense shearing, faulting and fracturing. Hot water fluids containing dissolved quartz and gold, report to these fractures in these rocks because the rocks tend to be brittle and respond to regional deformation by breaking and allowing dilation zones for the fluids to enter. The patterns of these dilation zones are quite specific and predictable according to observed laws of plastic and semi plastic deformation and fabric breakage. The study of the formation of these structures is called structural geology. When one says a deposit has favourable structure, one means that the regional forms of folding of the rock beds have created sufficient dilation zones to host plenty of precipitative gold bearing fluids. EC<:-}