Parent Layer:
CGS_IS62_1981_Colorado_NonMetallic_Mining_Locations
Sub Layers:
Name: Pre1981_mines
Display Field:
Type: Group Layer
Geometry Type: null
Description: CGS IS-62 1981 Colorado Non-Metallic Mining Locations, Pre-1981 mines (All_pre_1981mines.shp) and other shapefiles (subsets of the shapefile referenced here) – This is an inventory conducted in 1981 of historic nonfuel nonmetallic mining operations (e.g. industrial minerals, sand, gravel, aggregates, etc.) within Colorado. The “All_pre_1981mines.shp” contains all the data points including areas not related to sand, gravel, and aggregate resources. Therefore, the additional layers were included as subsets of this dataset and include sand, gravel, borrow, sandstone, silica sand, volcanics, clay and shale, crushed rock, decomposed granite, dolomite, limestone, and perlite. The original publication is: Schwochow, S.D., Inventory of Nonmetallic Mining and Processing Operations in Colorado, Colorado Geological Survey Map Series 17, 39 pp, 17 Plates, http://coloradogeologicalsurvey.org/. The shapefiles included here were published in the digital version of the original publication published as: Keller, J.W., Phillips, R.C., and Morgan, K., 2002, Digital Inventory of Industrial Mineral Mines and Mine Permit Locations in Colorado, Colorado Geological Survey Information Series 62. Some of the field aliases were updated with more descriptive names.
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