Bulletin - United States Geological Survey Volume 578-580 pdf
Bulletin - United States Geological Survey Volume 578-580 pdf
Bulletin - United States Geological Survey Volume 578-580 by Geological Survey
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Author: Geological Survey
Page Count: 222 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781236115140
Download Link: Bulletin - United States Geological Survey Volume 578-580
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...crystals of dolomite also project from the faces of the drusy quartz. Intersecting veins enter from both footwall and hanging wall, but a band of gouge everywhere separates the intersecting vein from the main vein, indicating later movement parallel to the strike. The ore occurred in small rich shoots, as in the Tightner mine. So much gophering has been done by lessees that it is impossible to deduce any rule covering the occurrence. It is certain, however, that around the edges of the large mass of quartz found near the intersection of the two veins very rich masses of arsenopyrite and free gold have been taken out. The trace of the northerly vein upon the main vein would be a line rising to the east, and it appears from the old workings as if the stopes tend to follow such a line. PLUMBAGO MINE (10). The Plumbago mine is situated on the south side of the divide between Kanaka Creek and the Middle Fork of Yuba River. It has been worked at intervals since some time before 1860, and the production is said to have amounted to several millions. Besides the old workings along the outcrop the vein is developed by five tunnels at intervals of 100 feet on the dip of the vein. There is a 20-stamp mill in operation on the property. The vein lies in a belt of amphibolite between two bands of serpentine. The amphibolite is less altered than usual, and specimens collected near the serpentine contact at the mine clearly show their derivation from gabbro. The amphibolite belt which contains the vein is about 300 feet wide at its widest part. It narrows to the northwest, where it passes under the gravels that cap the ridge, and it wedges out a short distance to the southwest. The vein strikes northwest and dips 3015o NE. The greatest thickness observed was about 6 feet. A...
Read online Bulletin - United States Geological Survey Volume 578-580 Buy and read online Bulletin - United States Geological Survey Volume 578-580 Download Bulletin - United States Geological Survey Volume 578-580 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Bulletin - United States Geological Survey Volume 578-580
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Bulletin - United States Geological Survey Volume 578-580 by Geological Survey
Author: Geological Survey
Page Count: 222 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781236115140
Download Link: Bulletin - United States Geological Survey Volume 578-580
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 Excerpt: ...crystals of dolomite also project from the faces of the drusy quartz. Intersecting veins enter from both footwall and hanging wall, but a band of gouge everywhere separates the intersecting vein from the main vein, indicating later movement parallel to the strike. The ore occurred in small rich shoots, as in the Tightner mine. So much gophering has been done by lessees that it is impossible to deduce any rule covering the occurrence. It is certain, however, that around the edges of the large mass of quartz found near the intersection of the two veins very rich masses of arsenopyrite and free gold have been taken out. The trace of the northerly vein upon the main vein would be a line rising to the east, and it appears from the old workings as if the stopes tend to follow such a line. PLUMBAGO MINE (10). The Plumbago mine is situated on the south side of the divide between Kanaka Creek and the Middle Fork of Yuba River. It has been worked at intervals since some time before 1860, and the production is said to have amounted to several millions. Besides the old workings along the outcrop the vein is developed by five tunnels at intervals of 100 feet on the dip of the vein. There is a 20-stamp mill in operation on the property. The vein lies in a belt of amphibolite between two bands of serpentine. The amphibolite is less altered than usual, and specimens collected near the serpentine contact at the mine clearly show their derivation from gabbro. The amphibolite belt which contains the vein is about 300 feet wide at its widest part. It narrows to the northwest, where it passes under the gravels that cap the ridge, and it wedges out a short distance to the southwest. The vein strikes northwest and dips 3015o NE. The greatest thickness observed was about 6 feet. A...
Read online Bulletin - United States Geological Survey Volume 578-580 Buy and read online Bulletin - United States Geological Survey Volume 578-580 Download Bulletin - United States Geological Survey Volume 578-580 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Bulletin - United States Geological Survey Volume 578-580
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