OF-99-19 Evaluation of Mineral and Mineral Fuel Potential of Yuma County State Mineral Lands Administered by the Colorado State Land Board


Includes a general summary of the geology, mineral, and mineral fuel potential of Yuma County along with topographic and geologic maps of tract locations. The main body of the report is an evaluation of the resource potential for oil and gas, coal, metallic minerals, and industrial minerals for individual tracts. Digital PDF/ZIP download. OF-99-19D

Four general categories of resources are included in this inventory:

  • oil and gas
  • coal
  • metallic minerals
  • industrial minerals and construction materials

Each individual tract evaluation includes:

  • A bar graph which ranks each tract’s resource potential for each of the four mineral categories. An explanation of the categories may be found at the end of this introduction
  • Tract identifier number, county name, and county location map
  • Tract location on a 7-1/2-minute United States Geologic Survey topographic map
  • Tract location on a United States Geologic Survey surface outcrop map
  • Location as to section, township, and range and approximate acreage
  • Overview of tract geology
  • Specific assessment of the resource potential for the four resource categories
  • References used in assessing tract potential

From the Introduction:

Yuma County, situated in the northeastern part of the state, has common borders with Kansas and Nebraska and to the east and Colorado’s Phillips, Washington, and Kit Carson counties to the north, west and south respectively. The county which covers 2,383 square miles has surface elevations that vary from 4,440 ft in the southwestern corner (T. 5 S., R. 48 W.), southwest of Joes, Colorado to the North Fork of the Republican River at 3,340 ft on the Colorado-Kansas line (T. 1 N., R. 42 W.). Surface topography is relatively gentle throughout the county. Surface drainage in the southern 60 percent of the county is controlled by three northeast flowing tributaries of the Republican River. From north to south these perennial streams are North Fork of the Republican River, Arikaree River, and South Fork of the Republican River. The popular Bonny Reservoir State Recreation Area is located in the latter drainage some 7 or 8 miles west of the Kansas line. Much of the northern 40 percent of the county exhibits only internal drainage because of the high permeability of unconsolidated wind-blown sand that covers this area of the county – locally called the Yuma County Sand Hills.