L. Warner makes about two millions yearly, employing 30 men. The proportion of sand used is from one-fourth to one-seventh. (The Geological and Natural History Survey of Minnesota, The Eighth Annual Report for the Year 1879, Submitted to the President of the University, Feb. 18, 1880, The Pioneer Press Company, St. Paul, MN, 1880, Page 118)
Warner Lucien…Chaska (Minnesota State Gazetteer and Business Directory including Dakota Territory 1880-81, Volume II, R. L. Polk & Co. and A. C. Danser, St. Paul and Detroit, Page 978)
L. Warner’s excavation, opened some ten years ago, from which he made about two millions of bricks yearly, employing thirty men through six months, is six rods south of the foregoing, and shows nearly the same section of clay overlain by till. This pit is twelve rods in diameter, nearly circular, and 25 to 30 feet deep, so that its bottom is but little above the river. The yellow clay, about 10 feet thick, is mixed with sand for tempering in the respective proportions of three and one; while the underlying dark blue clay, because it includes sandy layers, needs only an addition of one-sixth as much sand as clay. The junction of the yellow and blue clays is very irregular, with some interstratification, and both are much contorted. Pockets of yellow sand, 4 to 5 feet in diameter, concentrically laminated, occur in the upper clay, from which they are indistinguishable in color. The blue clay, into which this excavation goes 10 to 12 feet, and whose base was not reached by a boring 15 feet deeper, is preferred for brick-making. (A Report on the Geological and Natural History Survey of Minnesota, 1882-1885, Volume II, N. H. Winchell and Warren Upham, Pioneer Press Company, St. Paul, Minnesota, 1888, Page 142)