Bulletin, 325-329. sayılarU.S. Government Printing Office, 1949 |
Kitabın içinden
100 sonuçtan 1-5 arası sonuçlar
Sayfa 64
... bed rock of the Sunrise mining district , extends across Turnagain Arm , and may be seen in the valley of Knik River still farther north . The search for placer gold in rocks of this type is warranted , and discoveries of commercial ...
... bed rock of the Sunrise mining district , extends across Turnagain Arm , and may be seen in the valley of Knik River still farther north . The search for placer gold in rocks of this type is warranted , and discoveries of commercial ...
Sayfa 65
engaged in concentrating a metamorphic bed rock locally bearing gold , usually in the form of small mineralized quartz stringers . Though placers have not been found within the areas of older vol- canic rocks , mineralization has ...
engaged in concentrating a metamorphic bed rock locally bearing gold , usually in the form of small mineralized quartz stringers . Though placers have not been found within the areas of older vol- canic rocks , mineralization has ...
Sayfa 4
... bed rock . Introduction_ Grouping of deposits_ Disseminated deposits .. Concentrated deposits-- Cassiterite and galena bearing lodes . Distribution of mineralization__ Age of mineralization___ Separation of gold from bed rock ...
... bed rock . Introduction_ Grouping of deposits_ Disseminated deposits .. Concentrated deposits-- Cassiterite and galena bearing lodes . Distribution of mineralization__ Age of mineralization___ Separation of gold from bed rock ...
Sayfa 90
... bed rock exist within it as far as known , but sand and gravel prominences , rising in some instances 30 or 40 feet above the general level , are abundant over it , and are interpreted as remnants of a slightly higher level generally ...
... bed rock exist within it as far as known , but sand and gravel prominences , rising in some instances 30 or 40 feet above the general level , are abundant over it , and are interpreted as remnants of a slightly higher level generally ...
Sayfa 92
... bed rock by rivers and creeks and rest upon surfaces formed by such erosion . In general the gravels show less attrition than those of the gravel plains and become progressively coarser toward the heads of the streams . Although in an ...
... bed rock by rivers and creeks and rest upon surfaces formed by such erosion . In general the gravels show less attrition than those of the gravel plains and become progressively coarser toward the heads of the streams . Although in an ...
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Sık kullanılan terimler ve kelime öbekleri
Alaska Arkansas auriferous average basin beach beam bed rock bench Bendeleben Mountains boiler efficiency bowlders Cape Nome carbon cent Chickaloon chloritic clay clinker coal bed coal field coastal plain Collier combustion-chamber temperature creek bed curve deposits district ditch Drill hole dry coal east efficiency 72 fault feet thick formation Fort Smith fossils furnace Geological Survey geology granite gravel greenstone Gulch Hartshorne hydrogen inches Kigluaik Kigluaik Mountains Kougarok limestone lower Matanuska Matanuska River material miles mineral mining Mountains mouth Neuropteris Niukluk River Nome group Norton Bay Norton Bay regions Number of tests Ophir Creek outcrop pay streak placer gold Port Clarence pound of combustible pounds of dry probably quartz ratio reconnaissance reported River sample sand sandstone schist Seward Peninsula shaft Shale Shale roof shows slope Spadra stream surface tion tributary U. S. Geol upper valley veins
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