Molybdenite investigations in southeastern Alaska
Molybdenite investigations in southeastern Alaska
_;__________--__,-_-_--_-----____-_-.r_--_-___-_-...---"7 Molybdenite deposits of the Nunatak area, Muir Inlet, Glacier Bay, by W.'S. Twenhofel.----"--_____.._-_..____________..___ 9 Introduction._________________________________________________ 9 Climate..--_-----___-__--__--_.-.____._-_.______ 10 Geology.___-_--__---. .--_-__-----__--_____--_______ ... 11 Regional geology__________________________________________ 11 .Geology of the Nunatak area.-----------------__------__--_ 11 Bedded rocks.--_------_--__--..--_-___---____---___-_12 Intrusive rocks____-_--__-_----_-----__---~____---______ 12 Structure----------------------------------.---------. 13 Molybdenite deposits-----------------..----..-------._-_--___._ 13 Mineralpgy and paragenesis_.__________-_________ _._______ 13 Stockwork. ________________________________________________ 14 Fault deposits__.____-____.-_---_____-________._._____.___ 15 Origin of the deposits._---_-----_---_-----_____--_____-______-_ 16 Reserves.-----_----_--_---_-_---__---_-_-------__-____--_-__17 Grade,.-.-..--------------.------:.:------_-.I---.-...17 ' Tonnage___________-_-____----__._-_-.___--_-__--_-_____ 17 Economic considerations______________________________________ 18 Molybdenite deposit at Shakan, Kosciusko Island, by G. D. Robinson.._ 19 Introduction.-_-_--__._-__-___--_-----_--------_--_-_---______ 19 Regional geology.___-____-_-____--_-_-_---____-_-__.__________ 21 Molybdenite deposit._____--_____________----__i-_-______-___-_ 21 General description._______________________________________ 21 Ore minerals._-_-____--_------------_--_------_-_---____-22 Gangue.-.___________.________--.--__-.-_____ 22 Country rock.____________________________________________ 23 Time relations._.____-____--_____._-__--____-.___-_____.__ 23 Origin. ___________________________________________________ 24 Structure. _ ___-___--__----__---_-_------__----_------_-_-_ 25 Factors influencing molybdenite distribution____--__..__-____. 26 Reserves _______________________-_-_-_-----_---^----------__-_ 27 Grades and dimensions of ore shoots.________________________ 27 Tonnage.___.__..__...____________._-.-__...30 Molybdenite deposits on Baker Island, by G. D. Robinson____________ 3
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