Interesting article on stuff about old ghost towns, including those due to gold - http://www.stuff.co.nz/travel/destinations/nz/83051120/west-coast--the-ghost-town-capital-of-new-zealand
Another ghost town, bit of prospecting, might be okay for a detect:
you can read all about nenthorn in a book called “nenthorn gold and the gullible” by terry hearn
The lanscape looks amazing from google earth.
Especially Redan Crater off the the west.
try reading "ghost towns of new Zealand " by david mcgill
Think I caught some of that on Radio Live Sunday nights.