A comparative study of stream water and stream sediment as geochemical exploration media in the Rio Tanama porphyry copper district, Puerto Rico

Targeting Cu–Au and Mo resources using multi-media exploration geochemistry: An example from Tyonek Quadrangle, Alaska Range, Alaska

“…The suite is similar to that measured in groundwater around other porphyry Cu deposits (e.g. Learned et al, 1985;Leybourne and Cameron, 2010), where elevated Cu, Zn, and SO 4 concentrations can be attributed to weathering of chalcopyrite, sphalerite, and iron-sulfides. Molybdenum and Re (a common trace element primarily hosted within molybdenite in porphyry Cu systems; McCandless et al, 1993), are likely derived from molybdenite, although chalcopyrite and pyrite (e.g.…”

Natural Background Determination and Impact Quantification in Trace Metal-Contaminated River Sediments

“…Estim ation o f the p re -m in in g dispersion tra in and q u a n tific a tio n o f the exaggerated a nom aly are im p o rta n t pieces o f in fo rm a tio n re la tiv e to the und erstanding, h tig a tio n , and re m e d ia tio n o f contam inated riv e rs aro u n d the (Leggo, 1977;Coolbaugh, 1979;Fleming and Neale, 1979;R ibeiro et al, 1979;F riedrich et al, 1984;Learned et al, 1985). (Mosser and Zeegers, 1988).…”

Future Global Mineral Resources

“…The 2+ orders of magnitude reductions in detection limits that have been achieved using Inductively-Coupled Plasma Mass Spectrometry (ICP-MS), and analysis of sediment fractions <75 μm in size, offer scope for previously explored areas to be re-evaluated, since sub-cropping or shallowly buried deposits may produce low-level geochemical anomalism that was not detected by older surveys. Analysis of water collected from flowing streams also has been employed as a drainage geochemical technique (e.g., Learned et al, 1985), in effect reproducing an old prospecting technique reported by Agricola, along with other details of Late Medieval stream sediment geochemistry, as well as increasing groundwater sampling.…”