DUBUQUE AND LAKE SUPERIOR MINING COMPANY
An estimated $100,000 was spent on development work and machinery. (3) Disagreements, however, about the management of the company prevented further progress. (4) The site was again the interest of mining operators in 1915.
1. "Superior Capitalists Here," Telegraph Herald, Sept. 17, 1906, p. 9. Online: http://news.google.com/newspapers?id=wfhCAAAAIBAJ&sjid=-KsMAAAAIBAJ&pg=3246,3118866&dq=dubuque+and+superior+mining+company&hl=en
2. "To Resume Mining Operations Here,: Telegraph Herald, Aug. 18, 1915, p. 19. Online: http://news.google.com/newspapers?id=cKFdAAAAIBAJ&sjid=81wNAAAAIBAJ&pg=3691,7445488&dq=dubuque+and+superior+mining+company&hl=en