<prompt> Bhala okuqhubekayo kwalesi sigaba - Ngesikhathi umkakhe nezingane zakhe behlala eNgilandi naseFrance, uBurnham wabuyela eNyakatho Melika ngo-1907 futhi eminyakeni embalwa eyalandela wahlanganiswa nephrojekthi yokunisela uMfula iYaqui eMexico nomfowabo uFred. Ngo-1908, yena noW. A. Wadham waseLondon, eNgilandi, bathatha uhambo lwezinyanga ezimbili lokuyocwaninga nge-geology nokumbiwa kwezimayini eSonora egameni lamabhizinisi aseMelika nawaseNgilandi. Kwenziwa izingxoxo zokuthenga izindawo ezine: iBatue, iMequite, iLa Fiera, nenye indawo. Wayecabanga ukuthi iLa Fiera iyona engcono kunazo zonke futhi ibutho elincane lamadoda ngaphansi kokuqondiswa kukaJohn Anderson lamiswa ukusebenza lapho. Ngo-1909, wahamba noHector Walker waseNgilandi ohambweni olungaba amakhilomitha angu-500 besuka ePhoenix, e-Arizona, beya eMexico, bese beya empumalanga bedlula eChihuahua beya eSierra Madres beyofuna amadlelo amahle namaminerali. Umfowabo wathenga amalungelo amanzi nezinye izindawo kule ndawo futhi waxhumana nomngane omdala wakwaBurnhams wase-Afrika, uJohn Hays Hammond, owenza izifundo zakhe wabe esethenga enye ingxenye yaleli zwe - indawo elingana neRhode Island. Lapho nje amaphrojekthi okunisela nokumbiwa kwezimayini esondela ekupheleni ngo - 1912, uchungechunge olude lwezinguquko zaseMexico  <response>: kwaqala. Isishayo sokugcina ezinhlelweni zikaBurnham-Hammond safika ngo-1917 lapho iMexico imisa imithetho evimbela ukuthengiswa komhlaba kubantu bakwamanye amazwe. Imikhaya yakwaBurnham neyakwaHammond yayigcina izakhiwo zayo kwaze kwaba ngo-1930 yabe isizithengisela uhulumeni waseMexico. 