Due to the world-wide interest in the mining activities on the Thames Goldfields, looking at the old newspapers around the world provides information and photographs.
Trove is a great place to start to explore Australian resources. Below is an example that shows two sketches around Thames. Source: Monday 9 November 1868, Illustrated Australian News for Home Readers.
The top picture is: MOUNT EDEN CLAIM, AND KURUNUI TRAMWAY, THAMES RIVER GOLD-FIELD, NEW ZEALAND.
The lower picture is: HUNT'S CLAIM, AND KURUNUI TRAMWAY, THAMES RIVER GOLD-FIELD, NEW ZEALAND