Filters: partyWithName: U.S. Geological Survey (X) > Types: OGC WMS Layer (X) > partyWithName: Charles N Alpers (X)

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Geochemical, mineralogical, and grain-size data for in-situ solid materials and suspended sediment at Malakoff Diggins State Historic Park, Nevada County, California This dataset includes data for in-situ solid materials and suspended sediments from surface-water samples, as well as surface-water chemistry from samples collected during storm events at Malakoff Diggins State Historic Park, Nevada County, California. In-situ solid samples were collected during 2015 along six vertical transects along the cliff walls of the mine pit. Surface-water samples were collected during 2014 and 2016 from Hiller Tunnel and from drainage networks below the in-situ sampling sites during runoff conditions. In-situ and suspended-sediment samples were analyzed for grain-size distribution, X-ray diffraction (XRD) for quantitative mineralogy, inductively coupled plasma - mass spectrometry (ICP-MS)... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Ancestral Yuba River, California, Humbug Creek drainage, Malakoff Diggins State Historic Park, Nevada County, All tags... Sierra Nevada Mountains, USGS Science Data Catalog (SDC), Yuba River watershed, clay minerals, erosion, geochemistry, gold mining, grain-size distribution, hydraulic mining, legacy mining effects, mineralogy, sediment transport, suspended material (water), Fewer tags Update of the Mineral Resources Data System for California including Mineral Deposit Types There are more than 42,000 entries in the USGS Mineral Resources Data System (MRDS) for the State of California. Previously, the field for deposit type was sparsely populated, which made it difficult to evaluate mine sites needing environmental remediation. This has been rectified by populating the deposit type field using 100 deposit types cited in previous USGS publications, and 137 provisional deposit types described here. Other categories listed in the deposit type field include 29 types of mineral processing facilities, 6 miscellaneous categories used previously in MRDS, and 56 unclassified categories tied to primary commodity. References are provided for each deposit type, as available, including descriptive... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, Mineral Resources, USGS Science Data Catalog (SDC), economic geology, geospatial datasets, All tags... mineral resources, Fewer tags