An aggregate total of 1,250 sqm had been surveyed by the end of December 1872, 1,800 by 8 June 1873, 2,300 sqm by 22 January 1874, and 3,000 by 23 April 1874. Tyrwhitt-Drake died from fever (thought to be malaria) on 23 June 1874,[13] and on 19 Nov 1874, 24 year-old Lieutenant Herbert Kitchener joined to replace him.[14]