Bulletin, Tema 60U.S. Government Printing Office, 1895 |
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Página 6
... of the marls , syenitic rocks were introduced , causing the sandstones and schists . to be converted into porphyries . This eruption was accompanied by and probably connected with the formation of auriferous veins 6 PERU .
... of the marls , syenitic rocks were introduced , causing the sandstones and schists . to be converted into porphyries . This eruption was accompanied by and probably connected with the formation of auriferous veins 6 PERU .
Página 7
... veins , the elevation of the strata , and the faulting of the veins . The next period represented by strata is characterized by saliferous and gypseous marls , which rest unconformably on the rocks beneath . On the west side of the ...
... veins , the elevation of the strata , and the faulting of the veins . The next period represented by strata is characterized by saliferous and gypseous marls , which rest unconformably on the rocks beneath . On the west side of the ...
Página 63
... Peru . In the maritime Andes , where the rocks are of a crystalline character , gold is found in veins of quartz , which are intruded into the granite and syenite . 63 In This auriferous quartz is accompanied by oxide of iron.
... Peru . In the maritime Andes , where the rocks are of a crystalline character , gold is found in veins of quartz , which are intruded into the granite and syenite . 63 In This auriferous quartz is accompanied by oxide of iron.
Página 64
... veins of gold are found not only in crystalline earths , but also in metamorphic rocks , such as quartzite and slaty schist , intruding themselves into the sedi- mentary and eruptive formations . In these veins the gold is in a pure ...
... veins of gold are found not only in crystalline earths , but also in metamorphic rocks , such as quartzite and slaty schist , intruding themselves into the sedi- mentary and eruptive formations . In these veins the gold is in a pure ...
Página 65
... vein of the " Chuyurco " hill is called the Reo , from its traversing the gorge of that name , and is 2,500 feet long , varying from 1 to 6 inches in thickness . Another vein , called the Hovaluena , is from 12 to 20 inches thick . The ...
... vein of the " Chuyurco " hill is called the Reo , from its traversing the gorge of that name , and is 2,500 feet long , varying from 1 to 6 inches in thickness . Another vein , called the Hovaluena , is from 12 to 20 inches thick . The ...
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