They used to dig up $200 million worth of timber a year, mostly exported to China, until the government cracked down on exports. It's illegal to export unfinished native timber, so exporters exploited a loophole by cutting the trunks into "tabletops", or adding basic carvings and labelling them as "totem poles", and then shipping the logs to China for further processing.
[1] https://www.nzherald.co.nz/nz/giant-ngawha-swamp-kauri-log-d...