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Gold/Mining/Energy : Winspear Resources

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To: Dave M who wrote (15527)	3/8/1999 11:16:00 PM
From: Walt	Read Replies (3) of 26850

Ok folks strike and dip 101. Get yourself a book, preferrably a big coffee table book. Set in on a table and then put something under one side of it, something like an ashtray or small rock sample. Do this along the spine side of book so the spine side is the up side. so the book now has a fifteen degree slant. Now go get a big bucket of sand and cover everthing but the little bit of spine stiking up. The sand represents the earths surface. If you were a tiny ant you could walk along the exposed strip of book spine and that is the strike. Dip is the angle it dips into the sand pile and down dip is in that direction so in this case it is at right angles to the dyke. Now if you take a staw and stick it into the sand that is like a drill hole. So drilling a hole along strike means you are moving in the direction of the books spine. If you go along strike witha series of holes they will all be the same depth of sand before you hit the book. Drilling down dip means you are going at right angles to the spine. So the farther down dip you go the deeper your holes will get. If you do a big step out along strike and then want to find out where the book (dyke) surfaces then you would start drilling holes up dip and the holes would get shallower before you hit the dyke. If you were the ant on surface at the exposed bit of book spine you would pull out your compass and sight along the spine. That is the strike. Then you would measure the angle the book goes into the sand that is the dip. So your stike could be NW-SE and your dip 15 degrees to the NE. hope that helps I know it can get a little confusing. If you have a peaked roof on your house the strike is the angle of the peak the dip is the slope of the roof. In that case it might have a strike of N-S and since it dips both ways you would have a W dip of say 35 degrees and an E dip of 35 degrees. If you were going along strike you are walking parrallel to the peak. Down dip would be walking toward the eaves and up dip toward the roofs peak. Hope that helps regards Walt

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