Colorado Mines Day 5 Part 2 The Mayflower Mill The 22/11/2012· It was built in 1929 to process gold silver zinc lead and copper ores Another large mill nearby was the Silver Lake Mill on the Animas River Map of aerial trams in Arrastra Gulch near Silverton Colorado Built of pre framed Oregon fir and completed in six months for $373 000 the Mayflower Mill began processing ore in Feb 1930 and continued in operation for 49 of the next 61