The surface mines were digitized from 7.5' quadrangle maps. Areal and positional accuracy are estimated to be 48 meters. These mines are known as point locations only. The points were plotted on 7.5' quadrangle maps which were the source for digitizing. Areal accuracy cannot be estimated.
Positional accuracy is estimated based on the precision of the location.
The positional accuracies of the points are estimated to be 800 and 1600 meters, respectively. It is used for the purpose of queries and plotting. It resides in the Natural Resources Geographic Information System library. Although efforts have been made to make it useful to the Department, the Department assumes no responsibility for errors in the information. Similarly the Department assumes no responsibility for the consequences of inappropriate uses or interpretations of the data made by anyone to whom this data has been made available.