Don't know whether this Gent has got the wrong end of the stick, but
1) de Havilland designed, built and named two Comets -
A) The DH twin engined monoplane which won the MacRobertson Air Race from England to Australia in 1934 and was also the forerunner to the Mosquito'
B) the DH106 (first ever jet airliner, despite what Boeing may say) of the 1950s on.
I cannot find any other reference to the name of Comet painted on an aeroplane.
2) There is a "Comet" Gold mine located in close proximity to Marble Bar, in the Pilbara.
Gold was discovered in the area in the 1880s and the Mine opened in 1936 & closed in 1955.
This mine was served by Airlines (WA) Ltd, for some of those years.
As an aside, & as related in my Book "I FLEW FOR MMA'', MMA used to serve the Big Bell Gold Mine, out from Mt Magnet. The first couple of times after I joined in 1955 we landed there in the DC-3 & took on board the usual load of pure gold for the Perth Mint. We were then handed a Smith & Wesson revolver with which 'to protect the Bullion' .
The Captains (all wartime operational pilots), soon put a stop to that!