These are taken from five sample source categories, each with a letter designation included in the computer filename. H2O-P minus dry wt. On elements with no analytical method designated, information on the method used is no longer available. The precision of the quantitative analytical techniques used permits the use of two significant figures. Due to the formatting used by the computer programs in compiling this data, some of the data reported contain one or more insignificant digits beyond the two significant figures and should be ignored.
Amount detected is greater than the maximum limit of determination.
For information concerning recent analytical methods, instrumentation, laboratory procedures, and quality control, see Arbogast, ed. The Mineral Resource Data System data originates not only from USGS studies but also from other federal and state agencies and primarily pertains to mineral commodities. The Nevada dataset on this diskette includes information on 7012 sites. The data included here comprise 48 out of a total of 59 fields and contain mine name, location, deposit type, mineral age, commodities, products, and tectonics information. The Nevada MILS data set contains over 8000 sites with 64 fields of data.