What's New. The Public Land spatial data sets (shapefile) contains Public Land Survey section polygons that had mining claims recorded in the Bureau of Land Management's LR2000 database as of December 31, 2010 (from a March 1, 2011 data extraction) for the period from 1976 to 2010 in Arizona, Arkansas, California, Colorado, Florida, Idaho, Montana, Nebraska, New Mexico, Nevada, North ...