Top Energy has turned down what chief executive Russell Shaw described as "big sums" offered by Chinese interests to extract swamp kauri in the geothermal fields around Ngawha.
He said Top Energy's response was that the kauri was "too precious to sell".
Top Energy and Far North District Council are seeking a permanent protection order for the kauri lying buried within the geothermal zone. He said the Ngawha geothermal field had huge potential for tourism.
Meanwhile, the Northland Environmental Protection Society's (NEPS) challenge to laws allowing the exportation of ancient swamp kauri is being played out in the Auckland High Court this week.
The environmental group is seeking a judicial review before Justice Kit Toogood, challenging the Ministry for Primary Industries' interpretation of the act governing the export of native wood.