The Historical use of Vegetative mapping to define areas containing gold bearing deposits is steeped in tradition, folklore and quite some mystique. The early Victorian Gold miners in the 1850s used the exact same method to help find and sink on the shallow Gold leads
- ordovician-victoria.jpg (111.17 KiB) Viewed 1443 times
Image source: Google Maps. Web: https://maps.google.com.au/
The Victorian example was originally looking at because in Tasmania. we get the exact same association. With the same species of tree! I then noticed the vegetation in the Central Victorian Gold Fields (Golden Triangle) is a different colour to the rest of the vegetation in the state. And knew it was related to soil condition. And, It is. its because of the Ordovician sediments laid down 490 million years - 430 million years ago. And, neatly Dividing the Cambrian and later Silurian systems. The area above in Victoria produced the most big gold on the planet.
Ever want to know why? well so did i.
i used the same imaging to find all major Australian Ordovician sedimentary gold deposits in a few minutes. fragments of 490 million year old Ordovician occur in Tasmania. Moina, Back Creek, Lisle, Mathinna, Beaconsfield, Calder/ Wynyard, bald hill, Gladstone and upper Scamander, etc. And, as far away, as the Northern Territory. The vegetation changes are being mapped in each.
The Cratons in WA and SA are much older than the east coast. so ive not worried about it till this one is done. Its more than enough country for one person to do.
This is not an exhaustive explanation to why gold occurs in some places and not others. And i'm not going to go into how to use it to pinpoint areas. But, by using the vegetation you can predict the soil below, without even being there. And, the likelihood of gold being found. Its as passive as i can get.
All Ordovician areas in Australia are well known gold fields, Hill end, in NSW etc and it correlates perfectly to what we have in Tasmania. The vegetation helps delineate the area on the ground.
Gold occurs in many other areas, but non so rich in the East as the Ordovician.
- Ausgeolbasic.jpg (127.19 KiB) Viewed 1443 times
Image source: Geoscience Australia. Web: http://www.ga.gov.au/