Professional Papers
Professional Papers
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In our eReader you can find the full English version of the book. Read Professional Papers Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Professional Papers
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Between 541 and 573 feet the rock was quartzite. Then porphyrite con- tinued to the bottom of the hole, at 706 feet. The evidence afforded by these borings will be referred to after other mat- ters have been passed in review.
III. THE ORE-OCCURRENCE.
In the investigation of the relation between the ore-occur- rence and the rock-structure it is found that there are two dis- tinct systems of vein-fissuring. One series of veins has a N. E. -S. W. Strike and a nearly vertical dip ; and this series ...is crossed and faulted by a second system, having an approxi- mately IN", and S. Trend and a flat dip. The former are ore- bearing and are called " verticals " or " pay-veins ; " the latter are barren of valuable ore and are termed " cross-veins. " Both series fail to reach the present surface, save where deep erosion has occurred ; because in coming up through the Carboniferous THE ENTERPRISE MINE, RICO, COLORADO. 13 formation they are abruptly terminated in their near approach to a certain horizon marked by the occurrence of black shale and beds of crushed lime.
What to read after Professional Papers?
You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Between 541 and 573 feet the rock was quartzite. Then porphyrite con- tinued to the bottom of the hole, at 706 feet. The evidence afforded by these borings will be referred to after other mat- ters have been passed in review.
III. THE ORE-OCCURRENCE.
In the investigation of the relation between the ore-occur- rence and the rock-structure it is found that there are two dis- tinct systems of vein-fissuring. One series of veins has a N. E. -S. W. Strike and a nearly vertical dip ; and this series ...is crossed and faulted by a second system, having an approxi- mately IN", and S. Trend and a flat dip. The former are ore- bearing and are called " verticals " or " pay-veins ; " the latter are barren of valuable ore and are termed " cross-veins. " Both series fail to reach the present surface, save where deep erosion has occurred ; because in coming up through the Carboniferous THE ENTERPRISE MINE, RICO, COLORADO. 13 formation they are abruptly terminated in their near approach to a certain horizon marked by the occurrence of black shale and beds of crushed lime.
What to read after Professional Papers?
You can find similar books in the "Read Also" column, or choose other free books by T a Thomas Arthur Rickard to read onlineMoreLess
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