I and L uranium and thorium vein system, Bokan Mountain, southeastern Alaska

Geophysical interpretation of U, Th, and rare earth element mineralization of the Bokan Mountain peralkaline granite complex, Prince of Wales Island, southeast Alaska

“…Chiefly, the BMC includes two main lithologies: an arfvedsonite granite core that is surrounded by an outer ring of mostly aegerine granite (Dostal et al, 2013). The granite has a 2-to 3-km-wide aureole of albitized country rocks (MacKevett, 1963;Staatz, 1978;Philpotts et al, 1996). The albitized aureole around the pluton is the location of many U-Th-REE prospects and has been interpreted to be related to either hydrothermal activity or magmatic activity associated with the peralkaline granite (Mackevett, 1963).…”

“…A significant amount of research has been conducted on the uranium and REE mineralization at Bokan Mountain since the late 1950s (MacKevett, 1959(MacKevett, , 1963Staatz, 1978;Thompson et al, 1982;Thompson, 1988;Warner and Barker, 1989;Philpotts et al, 1996;UCore Rare Metals Inc., 2011;Dostal et al, 2011Dostal et al, , 2013Dostal et al, , 2014Barker and Van Gosen, 2012). Uranium mineralization was recognized in the mid-1950s at the Ross-Adams deposit, which brought more interest and scrutiny to the geology at Bokan Mountain, eventually leading to the recognition of rare earth mineralization.…”

“…Rare earth mineralization is hosted in four types of deposits at Bokan Mountain: (1) shear zones and faults that cross the BMC; (2) pegmatites within and along the margins of the BMC; (3) within structurally controlled, northwest-trending sets of thin dikes (vein-dikes) that extend outward from the granite; and (4) in subeconomic placer deposits in postglacial sediments (Staatz, 1978;Warner and Barker, 1989).…”

Thorium resources of selected regions in the United States

“…The larger and better explored veins lie along the mountain's southeast flank. The best known group, which consists of a number of parallel and subparallel veins that can be traced for 1.6 miles, belong to the I and L system (Staatz, 1978). Exposures are generally poor, and heavy soil cover and thick vr~getation make tracing individual veins difficult.…”

Adsorption of Low-Concentrated U(VI) on a Preferable Crystalline Boehmite (γ-AlOOH) in Alkaline Conditions

“…Uranium(U), as a radioactive element, possesses high toxicity and radioactivity that is hazardous for human health and the environment, even at low concentrations. 1−4 Generally, U(VI) ions in solution primarily exist as U(VI)O 2 2+ , U(VI)O 2 OH + , [U(VI)(O 2 ) 3 (OH) 7 − ], and [U(VI)(O 2 ) 3 (OH) 5 + ] (pH < 6.5). At 6.5 < pH < 14, U(VI) was hydrolyzed to form the hydroxylated uranyl hydrate.…”