Any hardcopies utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.
Shapefiles were converted to individual ArcInfo coverage files using the ArcToolBox 'shapefile to coverage wizard' and defined the common projection as UTM Zone 12, NAD 83, units meters.
CAD files were converted to individual ArcInfo coverage files using the ArcToolBox 'dxf to coverage wizard' and projected to common projection (UTM Zone 12, NAD 83, units meters).
These new coverages were spatially adjusted to digital raster graphic images and then plotted. These plots were compared to the previous PHOSMINE coverage and corresponding digital orthophoto quarter quadrangle (DOQQ) TIFF images. Phillip R. Moyle provided information for mine feature classification based on his prior knowledge of the mines and their workings.
Inconsistent or missing data were corrected or added by means of on-screen digitizing off DOQQ TIFF images.
Databases were then converted to a standard database structure. Two items were added to the active mine database: one for 'ACTIVITY' and one for 'OF_DATE'. The 'FEATURE' mining terms were further standardized to match a new set of mining term definitions specific to this report. This work was done in the .aat and .pat files. The arc attributes for linecode and source were defined in the coverage. The polygon attribute for 'ORIG_FEAT', 'OF_DATE', 'FEATURE', 'SOURCE', and 'ACTIVITY' were added or revised in the coverage. The attributes 'ACRES' and 'HECTARES' were calculated in the .pat file. Look-up tables were built to hold brief, descriptive information about arcs (mining feature limit, road, railroad, power line, pipeline or building footprints), and map source references.
Line and polygon topologies were merged (using Workstation ArcInfo) for all spatial databases that contained active mines. Paper plots were made and visually compared with original source documents.
The resultant line and polygon information was spatially revised in areas where linework did not properly match up. Again, paper plots where made and visually compared with original source documents and first plots.
The active mine spatial database and the inactive mine spatial database were merged into one spatial database: PHOSMINE01.
Revisions were made to the PHOSMINE01 database and metadata based on technical reviews and subsequent internal review prior to publication.
In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
This spatial database is not to be used at any scale greater than 1:24,000 (for example, 1:12,500).