19 research outputs found
Temporal Trends of Dissolved Trace Metals in Jamaica Bay, NY: Importance of Wastewater Input and Submarine Groundwater Discharge in an Urban Estuary
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OCEAN THERMAL ENERGY CONVERSION (OTEC) PARTICULATE PROGRAM 1980, ST, CROIX (VOTEC)
Mercury deposition in a tidal marsh downstream of the historic New Almaden mining district, California
A record of mercury deposition was provided by sediment recovered from piston cores of a
San Francisco Bay tidal marsh that is 30-km downstream of the New Almaden Quicksilver mining
district, formerly the largest mercury mining district in North America. Pre-mining sediment
concentrations were ng g, which are similar to pre-mining concentrations in cores taken from
other parts of San Francisco Bay. Concentrations in the core increase to about 1200 ng g, after a peak of
mining activity in the early to mid 20 century. The extent of contamination from upstream mining
activity appears to reflect the amount of processed ore disposed of at the surface and also from periods
when mercury was recovered from reworking these surface ore dumps and open cuts. Although San
Francisco estuary is contaminated with mercury from numerous historic mining sources, including late
19 century hydraulic gold mining in the Sierra Nevadas, the contamination in the southern reach of the
estuary is predominantly from mining at New Almaden
Role of oceanic circulation on contaminant lead distribution in the South Atlantic
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