doing fifo financially smart
HomeMinesQLDMount Hay
P: 07 4934 7183 F: 07 4934 7346


  • Information
  • Jobs
  • Owner
  • Map
  • Major Contractor
  • What is mined

Mount Hay is what is left of an ancient and extinct volcano which was last active around 120 million years ago. At that time the rumbling volcano contained millions of gas bubbles that existed in molten lava, known as rhyolite. These gas bubbles have now cooled and are known as 'thundereggs.'

Mount Hay Thundereggs are Also Known as Volcanic Birthstones

Mount Hay thundereggs, sometimes referred to as volcanic birthstones, are small 'pockets' of molten lava that were filled with siliceous liquids that contained trace elements and impurities that crystalised as they cooled. Today they appear as an oversized pebbles or small rocks but when cut in half contain many brilliant colours and patterns. As the lava cooled the trapped steam and various gasses formed bubbles. These bubbles attracted silica and feldspar minerals that crystalised on the surface. Over the following years the bubbles went through a complicated process of filling, drying out, shrinking and cracking. At times the resulting cavities filled with banded agate, chalcedony, amethyst, or clear quartz crystals.

Fossickers are Encouraged to Seek out Their own Gemstone at Mount Hay

Today, people are encouraged to fossick through piles of thunderegg bearing material that has been excavated from the mine site nearby. The Mount Hay Gemstone Tourist Park was established near the thunderegg mine in 1974 to allow visitors to the site to dig for their own spherulitic rhyolite and thundereggs. It has become a popular place for fossickers to visit as it is located at Wycarbah, 36 kilometres west of Rockhampton, along the Capricorn Highway.

Fossickers are given a bag each to place their 'find' in as well as a fossicking tool. They are also told what to look for. They are also allowed to keep the stones they find. When finished two of their stones are cut for them at no cost.

Commercial Mining Began at Mount Hay in 1963

Commercial mining of rhyolite and thunderegg deposits began at Mount Hay in 1963 by Bert and Gwen Kayes. The same year they commenced mining of the Marlborough Chrysoprase deposit. They formed the company Aradon in 1986. Today, Aradon Pty Ltd, owns mines in the Northern Territory and Western Australia as well as Queensland.

Spherulitic rhyolite found at Mount Hay is also known as Rainforest Jasper, or Green Rhyolite. It is a fine grained glassy type of igneous rock with areas dominated by brown, opaque bearing glass. Thundereggs are spherical, or ovoid in shape and fossickers become intrigued whether the rock they have chosen from the pile brought down the mountain is indeed just a plain rock with its shape weathered by the elements, or in fact a thunderegg, with hidden beauty.

Aradon Pty Ltd specialises in the mining of thundereggs, rainforest jasper, or green rhyolite, variscite, black tourmaline, crazy lace agate, printstone, marra mamba tiger eye and jasper. The company exports rough stone and polished pieces throughout the world. Aradon Pty Ltd is a leading Australian gemstone mining company and supplier of quality gemstones.

Aradon Pty Ltd


Aradon Pty Ltd
7 Ferguson Street
Rockhampton, QLD 4700



View Aradon Pty Ltd Page

We Currently have No Jobs Specified for


Visit Jobs Section

No Information listed at this time ......

Following are the resources mined at Mount Hay

Y Fronts teaser banneriComplii MiningLink prefered resume writers Civil Link Banner
Boilermakers required for various roles for fixed plant and mobile equipment shutdowns

Riggers Dido

Operator Maintainer
Bis Industries requires an Operator Maintainer to join our operations at Karara, this is offered FIFO on 2:1 roster from Perth, come join the team!

Mc Truck Drivers Gunnedah
Bis Industries is seeking MC Drivers commencing at Gunnedah on a Monday to Friday roster and every other Saturday as required.

Mc Drivers Goldfields
Seeking expressions of interest from experienced MC Drivers, in consideration for multiple opportunities across our operations in the Goldfields.

Prelude Arrives In Australia
Shell Australia's Prelude floating liquefied natural gas (FLNG) facility has arrived in Australian waters this week after its 5,800km journey from the Samsung Heavy Industries shipyard in Geoje, ....

Australia's Largest Testing Rig Unveiled In Rocky
Siemens has invested $5 million into the Rockhampton Service Centre, which unveiled this week, Australia’s largest and most advanced gearbox load test rig for mining, wind power and other core ....

Dinosaur Find At Qld Mine Site
Palaeontologists and volunteers will work over the next month excavating and studying 30,000-year-old dinosaur bones at the South Walker Creek mine in Central Queensland. The team of eight people, ....

Black Thoated Finch Puts New Coal Mine At Risk
The controversial black throated finch is back to cause problems for Adani with a fresh legal challenge over the planned Carmichael coalmine. New advice has found the federal environment ....

Monadelphous Awarded $55M In Contracts
Monadelphous Group Limited announced on Wednesday it has been awarded a number of new work packages with a combined value of approximately $55 million. The engineering company will carry out ....