(a) Who is the supplier of coal for the Tshilidzini Hospital boiler, (b) when was the supplier appointed, (c) what is the total monetary value of the contract and (d) (i) what amount did Tshilidzini Hospital spend on coal for the boiler in the (aa) 2012-13, (bb) 2013-14, (cc) 2014-15, (dd) 2015-16 and (ee) 2016-17 financial years and (ii) who were the suppliers in each respective financial year?