Your reserves - Mineral Valuation
required. A 1 million tpy quarry, escalating at 2 percent annually, will sell 32 million tons in 25 years, and consume about 100 acres of a 100-ft. thick limestone deposit (32 million tons/320,000 tpa). A 500,000 tons per year sand and gravel pit, growing 1 percent annually, will sell about 14 mil-lion tons in 25 years, and consume about