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Ahh, yes, not for Kalgoorlie or Dunnsville though. 😞

As an avid prospector about to fly and then drive 10 hours return to head out to these parts, and after spending 5 days in the GT finding nothing but leadshot and junk, your generosity in sharing your local knowledge is very, very much appreciated. I’ll takeaway what you’ve said here and go off...

Are there any sources of WA 1:100 000 geological maps (Kal-Coolgardie) which are shapefiles (.shp) format? In other words, they are vectors, so I can load it into QGIS and filter shapes to display only particular rock types? I find it hard to believe only jpg type files are available as...

Thanks. It’s great to hear I’m at least somewhat on the right track. Just in regards to the AS or AF, could you just clarify which type you mean in the context of this legend for Kalgoorlie 100k geological map… I see Af, were you referring to the Asf when you say As? Also, are you saying just...

I understand. Trying to understand why the website above says… “Then you can understand the geological structures and rock types underneath and this is crucial to know when you are prospecting for gold at the surface.”

Thanks this is helpful. Although I’m still a bit confused… I just read on another website… “Factual geological maps in WA show what rocks and sediments are outcropping at the surface. Like the 1:250000 Map shown above The sediments at the surface hide the bedrock structures and rocks below...

Heading to Coolgardie region in a couple of weeks. I’m looking at the 100k geological maps and from what I have learnt from these forums and understand is that the Czl areas are the place to go. Faults, shear zones are also good. Wondering about contact zones. Which types of contact zones are...

..."4. You can fairly easily prospect uplifted gravels shown on geological maps - not a lot to learn. The gravels containing the gold will usually be identified as Tertiary (particularly Older Tertiary) or Palaeogene. And they will usually be called fluvial or river gravels (many other gravel...

goldierocks I made a map of veins for a larger region of Victoria. Its incredible to see the parallel mineralized reef zones you were talking about in your post above delineated like this. Like you say, zoom in to separate linear zones and focus your search downhill and along the structural...

Goldierocks, I would (and I imagine everyone else would) be very interested if you were to post a geological map of a goldfield in Victoria in which you markup the map and talk about the particular areas on the map you would and would not (just as important) focus on detecting for alluvial and...

I somehow missed this reply until now. Absolutely fascinating. As always goldierocks, your replies are a lucid exposition of concepts I have read in the literature but have had trouble grasping. …The tighter folding of such a zone can be recognized, and actual fractures without quartz can also...

...No, there is definitely no distinction being made. I know those reefs on the spreadsheet and those that say only "Quartz worked" were all worked for gold. Some are well known gold mines... Wow, there sure were a lot of auriferous quartz reefs. ...Not sure why you are using the "Geological...

Let me try that again...^ you should be able to click on the image and zoom in. Sure I understand what you are saying, but I am not talking about mines, i am talking about veins. Surely there were loads of quartz veins which didnt host gold, which is why the distinction exists? Side question...

Not standardized. That makes sense. Here is the screenshot. In the example, the full reference is two different map makers. I suppose Marlow doesn't use the term 'auriferous quartz worked' just 'quartz worked' whereas Edwards does.

Geology>Interpretations>State Wide Data (1990-2006)>Geology 100k>Geological Lines and Faults 100k

Ok that makes sense but the way geovic labels some veins as 'QUARTZ_WORKED' and others as 'AURIFEROUS QUARTZ WORKED' seems to delineate that veins with an of attribute 'QUARTZ_WORKED' was worked for gold, but didn't have gold? Could that be the case? I just cant understand why they would have...

"However, reefs have to be exposed at surface to shed eluvial gold" 1) Is there anyway to delineate exposed auriferous reefs on maps vs buried auriferous reefs? 2) In Geovic the layer "Geological lines and faults" does show "AURIFEROUS QUARTZ WORKED" as the "type" for such reefs however how to...

I was about to research dip, thanks for that. These illustrations are really helpful. But my question related to your use of the term “in the main”? What does this term mean? 😃 Edit: never mind. I see it means “in general”. Haven’t heard it before 😅.

Thanks for clearing that up for me regarding reefs at depths. That’s great info. I see you use this term a lot, ‘in the main’. What do you mean by that?

What do you mean by "(2) In structural zones, commonly narrow and linear within those rock types"? Could you provide an example on a geological map of what you are referring to in this point? Could you explain what you mean by the following italics? Is it possible to show an example of what...