Handwritten description of the Gates' Ore Breaker - Ref. Sec'y Mines Report 1891 page 43, Engineering, 19th June 1891. Notes give a detailed description of the Gates' Ore Breaker made by the Gates Iron Company of Chicago.document, gold, mining reports, gates' ore breaker, sec'y mines reports page 43 & 44 from 'engineering' 19th june, 1891, the gates iron company of chicago