Hi guys, I think you will find the "rubies" were garnets, a not gem cutting quality at that. NZ doesnt have cutting quality precious gemstones but has an asortment of semi-precoius gem stones.
Welcome to the site Rockchip. I have an interest in rocks & semi-precoius gemstones. Having lived in the Coromandel, I always come home from my gold fossicking expeditions with buckets of rocks. Jasper, opalised jasper, opalite, agate, quartz crystals, amethyst, carnelian chalcedony, kauri gum, petrified wood & obsidian.
Where abouts did you find petrified wood down here in Queenstown?
Yes the old miners needed water to work the ground for gold. If they new there was gold above where they were working they would go to great lengths to bring water to it. Often the gold bearing gravels were covered my meters of overburden that would have to be stripped away by the water to get at the gold. There wouldnt be many places where you could detect for gold that hasnt had the overburden stripped away by the old miners.
Happy hunting
JW :)