Geology: Exam 3: Bedrock of Wisco Groundwater Flashcards ...
Lead mining Started gaining popularity in 1820s1830s By 1829, more than 4,000 miners worked in southwestern Wisconsin, producing 13 million pounds of lead a year Peaked in the 1840s By 1844, a third of the miners had left to go to copper and iron mines In 1849, the California gold rush caused many more miners to leave the area