The Mines of ColoradoSamuel Bowles & Company, 1867 - 450 Seiten |
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Seite 13
... surface , every shade of cover and color , up and on until we reach the broad , snow - covered Range that marks the highest summits , and tells where Atlantic and Pacific meet and divide for their long journey to their far distant ...
... surface , every shade of cover and color , up and on until we reach the broad , snow - covered Range that marks the highest summits , and tells where Atlantic and Pacific meet and divide for their long journey to their far distant ...
Seite 45
... surface deposits derived from them . The fact is , it occurs where no igneous rocks come to the surface - in sedimentary rocks but slightly if at all metamorphosed . The largest surface deposit or placer of gold - bearing gravel in ...
... surface deposits derived from them . The fact is , it occurs where no igneous rocks come to the surface - in sedimentary rocks but slightly if at all metamorphosed . The largest surface deposit or placer of gold - bearing gravel in ...
Seite 46
... surface detritus is carried away by the gold- digger's hydraulic , the solid bed - rock , a micaceous or schistose slate , is dug up , assayed , or brayed in a mortar and panned , and found to contain coarse gold to the tune of three or ...
... surface detritus is carried away by the gold- digger's hydraulic , the solid bed - rock , a micaceous or schistose slate , is dug up , assayed , or brayed in a mortar and panned , and found to contain coarse gold to the tune of three or ...
Seite 48
... surface is decomposed into a hy- drated oxide , and contain gold disseminated through these substances , and sometimes in the adjoining rock in fine particles , or , occasionally , large lumps . These belts run with the strata and dip ...
... surface is decomposed into a hy- drated oxide , and contain gold disseminated through these substances , and sometimes in the adjoining rock in fine particles , or , occasionally , large lumps . These belts run with the strata and dip ...
Seite 51
... surface , which is not much untangled as they are worked . They exhibit phenomena which can only be explained by referring their ori- gin to different geological epochs , show displace- ment , cross and intersect each other at all conceiv-
... surface , which is not much untangled as they are worked . They exhibit phenomena which can only be explained by referring their ori- gin to different geological epochs , show displace- ment , cross and intersect each other at all conceiv-
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