Thought I'd start a string on all things ARRASTRA
(or arastra and other various spellings).
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An article which includes excellent information on various older (including colonial Spanish) methods of sinking mine shafts, the use of arrastras, and other gold and silver mining and processing (amalgamation/patio) techniques;
'A Spanish "Arrastra" In The Wichita Mountains' by W. Eugene Hollon
http://digital.library.okstate.edu/Chronicles/v034/v034p443.pdf
(or arastra and other various spellings).
----------
An article which includes excellent information on various older (including colonial Spanish) methods of sinking mine shafts, the use of arrastras, and other gold and silver mining and processing (amalgamation/patio) techniques;
'A Spanish "Arrastra" In The Wichita Mountains' by W. Eugene Hollon
http://digital.library.okstate.edu/Chronicles/v034/v034p443.pdf