coal (lignite), hot springs gold-silver, gold-silver mixed metal veins, distal disseminated gold-silver, antimony veins, tungsten veins, low-sulfide gold-quartz veins, polymetallic layers and veins, copper-silver polymetallic veins, manganese layers and veins, barite layers and veins, porphyry copper-molybdenum, copper skarn, iron skarn, disseminated copper-silver, kuroko zinc-copper massive sulfide, hot spring mercury, gypsum and anhydrite, tungsten skarn, gold-bearing skarn, disseminated antimony, zinc-lead skarn, and copper-gold mixed-metal veinsSee USGS Open File Report 98-219A for full descriptions of deposit types. Some deposit types have boundaries for both favorable and permissive areas for the occurrence of that type, although most have only one.
pnfcoal, pnfcummv, pnfskncu, pnfdiscu, pnfsknfe, pnfgyp, pnfhsau, pnfhshg, pnflosau, pnfmmvs, pnfmnlv, pnfplylv, pnfplyvd, and pnfporcu.An item in each of these coverages called "CODE" relates to another coverage that contains locations (points) of mineral properties (pnfmines). That coverage contains a lookup table - pnfmines.dm - that describes the meaning of the data in the "CODE" items.
The polygons are to be used for estimating where a certain deposit type might be found. The polygons are based on the state of knowledge in the mid 1990's and should not be used for any purposes other than indicating where one type of mineralization might occur.
Are there legal restrictions on access or use of the data?
Use_Constraints:The base was 1:100,000. All lines are approximations at that scale. The data is estimated to be accurate to + - 0.5 cm map distance at the base scale. Acknowledgement of U.S. Geological Survey would be appreciated in products derived form these data.