mt hay gemstone tourist park

thundereggs & spherulitic rhyolite (rainforest jasper)

Established in 1974 to allow visitors to dig their own thundereggs and spherulitic rhyolite, the Mount Hay Gemstone Tourist Park remains a popular destination for fossickers seeking these curious volcanic formations. Mt. Hay is the remains of an extinct ancient volcano, which was last active about 120 million years ago. When it was a rumbling volcano millions of gas bubbles were present in the molten rhyolite lava .. it is these gas 'pockets' that became thundereggs. Thundereggs or volcanic birthstones are the result of these “pockets” filling with siliceous liquids containing impurities and trace elements, which crystallize as they cool, and when cut in half, reveal many different colours and patterns.


Visitors can fossick through piles of thunderegg – bearing material which is excavated from the nearby mine site, and transported to a safe area suitable for all ages. Visitors are given a bag for their stones, a tool to fossick, and shown what to look for. Any stones collected can be kept, and upon completion of their search, each person can have a couple of stones cut for free. Extra cutting is available at extra cost. Fees apply for fossicking, and enclosed footwear is required. No fixed starting times.
Pets allowed if kept under control.

Caravan Park

The Park is 30 minutes west of Rockhampton on the Capricorn Highway ( A4 ) at Wycarbah, and is open 7 days a week. There is a camping ground and a caravan park with powered sites, shelter sheds and barbecue areas. Pets are allowed if kept under control.

Gift Shop

Also on site is a gift shop with an extensive range of gemstone and pewter products, including souvenirs, gifts, gemstone jewellery, carvings etc. and “Aradon Fine Pewter” products, which are manufactured on site.
The kiosk sells tea, coffee, soft drinks and ice creams. Open 7 days a week, 8.30am to 4.30pm.


If visitors wish to see the pewter casting factory, processing of gemstone, as well as fossick for thundereggs, then a guided tour is available.
This requires 1 – 2 hours.



Fossick for thundereggs, bag, tools and safety glasses provided. Our staff show you where and what to look for and explain the geological formations in the area.
Have 1 or 2 thundereggs cut free (depending on size).

Price: Adult $25, Child (5-17) $15, Under 5s $5
Family Rate (2+2 or more) - 10% off total price.


1. Fossicking as above. 
2. View the gemstone cutting and polishing operations.
3. Tour the pewter crafting workshop and follow the process from raw material to the finished products.
Time required:  1 - 2 hours

Price Adult $35, Child (5-17) $20.00, Under 5s $5
Family Rate (2+2 or more) - 10% off total price.


Tour Gemstone and Pewter Workshops and you choose either a “lucky dip” thunderegg to the value of $8.00 or select an item of pewter and get it for 25% discount.

Price: Adult $25. Child (5-17) $15, Under 5s $5
Family Rate (2+2 or more) – 10% off total price.

Group Prices - POA



Powered Site: 2 adults/1night $25 - $5 each additional person
Unpowered Site: 2 adults/1night $20 - $5 each additional person


Hot showers
Washing Machine

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