Those rituals were finally carried out last year but since then a new threat to the goldminers' rest has emerged.
The wreck's location in 40 metres of water about 15km offshore had until recently protected it from interference but improved technology has made it easier to reach.
Reports of divers removing parts of the wreck put the Chinese community, led by Rawene woman Wong Liu Shueng, in a race against time to protect the miners' remains.
She enlisted the support of the goldminers' descendants, iwi and Maritime NZ, and persuaded Heritage NZ (formerly the Historic Places Trust) to fast-track protection for the site. Dunedin GP Peter Sew Hoy, whose great-great-grandfather Choie Sew Hoy's remains went down with the ship, said he was deeply concerned when he heard about divers interfering with the wreck. He contacted Heritage NZ to express his concerns and lend his full support to Ms Wong's push to have the Ventnor declared an archaeological site.
"My great-great-grandfather's remains are on that ship. We're relieved and very happy that the site is protected," Dr Sew Hoy said.
The wreck was officially placed on the NZ Archaeological Association's site recording scheme on May 8.
Heritage NZ's Northland manager Bill Edwards said recreational diving was still permitted but the wreck was now covered by the archaeological provisions of the Historic Places Act 1993. That meant it was illegal to damage or modify the site, which included removing any objects. The protected area is a circle of 500m radius from the centre of the wreck.
Mr Edwards said the shipwreck was a cultural heritage site of international significance.
"It's also a tangible reminder of the important role the Chinese community played in the economic and social development of New Zealand," he said.
Pre-1900 archaeological sites are automatically protected by law. The Ventnor sank in 1902 so had no protection before May 8.
Dr Sew Hoy represents about 500 descendants of businessman Choie Sew Hoy, who came to New Zealand in 1868.