MS-55 Cenozoic Stratigraphy of Colorado 05/21/2025 MS-55 Cenozoic Stratigraphy of Colorado As a successor to previous Colorado stratigraphy charts (MS-53 Colorado Stratigraphic Chart and MS-54 Cretaceous Stratigraphy of Colorado), this publication resulted from a collaboration between the CGS, USGS, and the Denver Museum of Nature and Science (DMNS). The chart… Read More
OF-24-13 Baseline Radiological Study Year 3: San Luis Valley 05/21/2025 OF-24-13 Baseline Radiological Study Year 3: San Luis Valley The Colorado Geological Survey (CGS), a department of the Colorado School of Mines, has been funded through a grant from the Colorado Department of Public Health & Environment (CDPHE) to conduct a 5‐year study of baseline naturally occurring radionuclides and metals in groundwater obtained from privately owned residential water wells… Read More
OF-24-08 Baseline Radiological Study Year 3: Uravan Belt 05/20/2025 OF-24-08 Baseline Radiological Study Year 3: Uravan Belt The Colorado Geological Survey (CGS), a department of the Colorado School of Mines, has been funded through a grant from the Colorado Department of Public Health & Environment (CDPHE) to conduct a 5-year study of baseline naturally occurring radionuclides and metals in groundwater obtained from privately owned residential water wells… Read More
Cover page for OF-24-11 Reconnaissance investigation of critical minerals in historic mine-related effluent, Colorado 04/29/2025 OF-24-11 Reconnaissance Investigation of Critical Minerals in Historic Mine-Related Effluent, Colorado The work presented in this report is supported by the U.S. Geological Survey under the Earth Mapping Resources Initiative (EarthMRI). This report covers the potential critical mineral endowment of mine waste in Colorado, specifically from select acid mine drainage (AMD) sites, through field sampling and laboratory analysis. Please see our… Read More
Cover page for OF-24-10 Reconnaissance investigation of critical minerals in mine-related waste, Colorado 04/29/2025 OF-24-10 Reconnaissance Investigation of Critical Minerals in Mine-Related Waste, Colorado The work presented in this report is supported by the U.S. Geological Survey under the Earth Mapping Resources Initiative (EarthMRI). This report covers the potential critical mineral endowment of mine waste in Colorado, specifically from select mine waste pile sites, through field sampling and laboratory analysis. Please see our related… Read More
OF-23-04 Geologic Map of the Milton Reservoir Quadrangle 04/24/2025 OF-23-04 Geologic Map of the Milton Reservoir Quadrangle, Weld County, Colorado The purpose of this publication is to describe the geology, geologic resources, and geologic hazards of this 7.5-minute quadrangle. It is a continuation of field mapping work on the northern Front Range of Colorado where the CGS has cumulatively mapped over a dozen other quadrangles in the past several years. Read More
OF-21-03 Geologic Map of the Dry Creek Quadrangle 04/24/2025 OF-21-03 Geologic Map of the Dry Creek Quadrangle, Delta County, Colorado The purpose of this publication is to describe the geology, geologic resources, and geologic hazards of this 7.5-minute quadrangle. It is a continuation of field mapping work in the Grand Valley and Grand Mesa areas of the Western Slope of Colorado where the CGS has cumulatively mapped 22 other quadrangles… Read More
OF-22-08 Geologic Map of the Windsor Quadrangle 04/24/2025 OF-22-08 Geologic Map of the Windsor Quadrangle, Larimer and Weld Counties, Colorado The purpose of this publication is to describe the geology, mineral and groundwater resources, and geologic hazards of the Windsor 7.5-minute quadrangle. It is a continuation of field mapping work on the northern Front Range of Colorado where the CGS has mapped multiple quadrangles, this one covering the area around… Read More
Cover page for Colorado Mineral and Energy Industry Activities 2023-2024 04/17/2025 IS-87 Colorado Mineral and Energy Industry Activities 2023-2024 The next edition of our annual Colorado Mineral and Energy Industry Activities report is ready for download. This edition is based primarily on 2023 production data, with some additional information from 2022, and provides a comprehensive overview of Colorado’s energy and mineral resource production. 29 pages. Digital PDF download. IS-87D… Read More
OF-20-02 Geologic Map of the Agate Mountain Quadrangle, Park County, Colorado 04/17/2025 OF-20-02 Geologic Map of the Agate Mountain Quadrangle, Park County, Colorado The purpose of this publication is to describe the geology, geologic resources, and geologic hazards of this 7.5-minute quadrangle. It is located in the South Park region near the south- and easternmost extent of the Front Range. This quadrangle was mapped by CGS geologists Karen Houck, Jay Temple, Kassandra Lindsey,… Read More