Old Mine Cart, Mining Cart made in Denver. Here is a nice Mine Cart or mining car for hard rock mining. It was made in Denver as indied by the Get Price; The Motherload Estate Sale – Antique Railroad, Mining, Auto and . Aug 9, 2011 Antique Railroad, Mining, Auto and Farm, Fri., Sat., Sun. – Sept. 16, 17 18, 2011, 9am to 3pm.