Ref. Post #2369, the second photograph (PK-HBO during a refuelling stop) is rather faded, the helicopter is definitely in the red/white/blue Bristow colours, although at the time this scheme was still relatively new. Also, notice that the photograph is printed in reverse - look at the locations of the refuelling point and tail rotor.
The third photograph (PK-HBO again - details anyone?) shows the vessel 'Craestar', registered in Port Vila, Vanuatu. Formerly a Taiwanese trawler converted for seismic work, it was later transferred to the Indonesian register and renamed 'Ratna Sumatera' ('Pearl of Sumatra').
Both photographs are from the Rio Tinto Operation and show typical working environments, the Padang main base was only used for scheduled maintenance and crew-changes, they were probably taken circa 1973. The 'Craestar' was only used for a brief period which was just as well as only a few members of the heli crew could adapt to the onboard conditions - small and constantly moving. Chas Newport (ex RN) loved it while Mike McCormack (ex RAF) was permanently sea-sick!
The Rio Tinto Operation was a geological survey that entailed flying geologists into pre-determined points, usually small rivers or streams, to gather samples for analysis. The prime purpose was to identify commercially viable copper deposits. This analysis was done at Padang.
The full name of the client was Rio Tinto Bethlehem Indonesia (RBI) and this resulted is at least one bizarre event - one day a geologist received a letter from his sister addressed;
Mr. xxxx
Rio Tinto
Bethlehem
Indonesia
Everyone was amazed that it actually got to him!