Powertech's Centennial Uranium Project
PROGRAM
Our program last week was brought to us by Powertech Uranium Corporation. The company was represented by Terry Walsh, Bill Downey, Adria Hutchison, and Mike Beshore.
Walsh told us that the company is led by a management team that has over 100 years of combined management experience in in-situ mining. The local project is called the Centennial Project. The ore body lies at 400 to 600 feet below the surface east of Wellington. It is known as a roll front deposit which is a well-known geologic condition whereby the uranium that was originally deposited as part of volcanic ash (in this case from the eruption of Yellowstone about 35 million years ago) is leached by downward percolating groundwater. This uranium rich water is carried down gradient until it reaches a point where the oxygen, which helped dissolve the uranium and put it into solution, is depleted. The uranium then deposits onto the sandstone grains in the aquifer.
The in-situ leaching process is done by drilling a series of wells. One or more of the wells will act as extraction wells, and they will be surrounded by injection wells where oxygen rich waters are re-injected into the formation to put the uranium back into solution where it is then pumped out by the extraction well. This is done through a well known hydro-geologic principal called the cone of depression. ( a pumped well will create this cone of depression around itself in the water table. The pregnant solution is then brought to the surface where the uranium can be extracted.
In-situ mining has many advantages over other types of mining. There is minimal surface disturbance, no mill tailings to dispose of, surface users can continue to use the surface during mining with some limitations, and there is little surface clean up when the project is completed.
Permits are required at four levels of government:
- The EPA under the rules of the Safe Drinking Water Act
- The Colorado Department of Public Health and Environment
- The Colorado Department of Natural Resources
- The Weld County Planning and Zoning Commission
QUIZ
Hillary and Tenzing spent a total of 15 minutes at the summit of Mt. Everest.
Next question: Four months have no National Holiday. Can you name them?
Labels: in -situ, mining, Powertech, uranium, Weld County, Wellington


