Option I is concerned only with material from a "white nahcolite bed" in the Piceance Creek Basin, Colorado, containing a high concentration of sodium bicarbonate at a nominal depth of 1,900 feet. A nahcolite mine and processing plant is designed to mine 8,000 tons of nahcolite ore per calendar day yielding 4,071 tons per calendar day of soda ash product. This will require a total capital investment of $80,213,200 based on 1971 conditions. The soda ash will yield an annual income of $52,749,400. Annual operating expenses including labor, materials, maintenance, taxes, insurance, payroll overhead, and depreciation will be $18,821,900 in 1971 dollars. The discounted cash flow rate of return is equal to 30.74 percent based on a weighted average depreciation life of 12.88 Years.