Many of the victims are believed to have stayed temporarily in the main dwelling - the owner's residence - at the lodge over the past two and a half years. The business offers backpacking facilities, hotel units and, on occasion, longer term accommodation in the owner's residence.
Detective Senior Sergeant Rhys Johnston said police were at the very early stages of the inquiry:
"It is very important for us to speak to anybody who has stayed in the owner's residence over the last two and a half years," Mr Johnston said.
"These victims are unlikely to know that something has happened to them, although they may have suspicions. We will deal sensitively with them and offer all appropriate support required.
An 0800 number and an email address has been set up for people to contact police -- 0800 SNAP01 or 0800 762 701