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Lead in small deposits was mined by the French along the upper Mississippi as early as the 17th c. The lead mine at Austinville, Va was important by the time of the revolution. How pure the lead used in the 18th c. was dependent on several factors - the purity of the deposit mined, the knowledge & technology available at the time & place and the question (still debated today) of how pure was pure enough for the intended use. A letter written by Moses Austin on 1 Aug. 1791 refers to the addition of arsenic to the lead used in making shot at the shot tower (which still stands) in Wythe County, Va. so we know that by that time and at that place, an "improved" (for a specific purpose) alloy was in use.