By Steve Herschbach
A REVIEW OF GOLD MINERALIZATION IN EASTERN AUSTRALIA
A. R. WILDE
The purpose of this report is to review the different styles of mineralization encountered in Eastern Australia, their distribution and genesis, particularly in the light of discoveries which have resulted from intensive exploration in recent years, and has been compiled almost entirely on the basis of literature research. Only occurrences in the states of Victoria, Queensland and New South Wales were considered. The report is arranged by state, not because this is geologically justified but because the various state geological surveys, mines departments and mining journals are prime sources of data.
As I read the amazing "Reg Wilson" threads about the numerous large nuggets found in Australia I began thinking about the amazing depositional situation that created them. I have "Googled" a bit to try and find any literature on the subject, but have not found anything to satisfy my curiosity.
. Can anyone recommend any papers or books that describes the creation of the Australian deposits. I understand how gold is deposited, but what is unique about the Australian situation that resulted in so much large gold?
Finally; i get to my first post, and to the one and only Reg Wilson , probably the luckiest son of a gun this side of the black stump. I`m from south oz and i use an SD2200d primarily for it`s depth on large slugs, i don`t get out that often, not anywhere near as much as i would like, that`s my lot at the moment so i`ve got to cop it. Now; to some question`s, did you guys use that 36in monster coil over most known big slug old timer diggings in vic, if you did, i think it`s pretty pointless for the rest of us to go over that same ground, as we don`t have coils anywhere near that large ,don`t you think?
Do you think in the public detecting grounds in vic ,that any slugs larger than 20oz still remain in the 3-4 foot range, i don`t believe that they do, would be interested in your opinion on this.I recently tested my SD on it`s deepest setting, i cut the top of a coke can jumped in an old timers hole, measured 1 metre with tape measure, and with just a 11in dd coil picked it up easily, the sd`s were used for many years, so i would think that those big slugs at 3-4ft would of been picked up at that depth with these machines, and i believe after testing that a slug of 100oz or more could be got at upto 5ft going by the test i did, i would be keen to hear your take on all this. Was at Wedderburn recently, specifically at Queens Gully for the first time, what an impressive gully never seen one quite like it, and the old timers scored some big slugs from that gully,and i can see why, I had the 24in dd monster on, and got this clear signal, after digging a foot had to put on the 8in coil to pinpoint, then digging down another foot out came that little thingy you find on the top of a coke can to open it up. This coil picked that little piece of alumn at 20-24 in measured, which really shocked me, i don`t think the zed could do better than that on such a small piece, have you dug much small gold at this sort of depth coz that really impressed me?
I probably have a 1000 questions to ask you, but i wont overwhelm you, i`m sure you have better things to do with your time( like digging up more big lumps, please Reg, leave me at least one!! ha ha ha)
Post was to Reg, but if anyone else would like to chime in, go for your life!!
It seems they are still finding a few little nuggets out there Paul. I doubt they will let you detect there but maybe you can go near?
What say the Prospectors already over there?
By Jonathan Porter
Just returned from my annual trip away (that's another story for another day), I've been out 3 times detecting since getting home and two of those were training sessions. Yesterday morning it was my turn to do my own thing for a few hours before the heat beat me to a pulp. A few minutes later and I had a plucky 1 gram nugget on a continuation of a spot I detected with my son Timothy back in July (got AU$800 worth off there for the session, much to the delight of his pocket book).
There is a fair amount of trash and the obligatory shot gun and 22 bullets along with the added hassle of a high voltage power line, so I had to concentrate on the wide broad deeper sounding targets mixed in with the Sferic and 50 Hz noise, 3 hours of this and you find yourself needing a little lay down. This location is also problematic because it is on a slope above a straight flowing gully so the coil is opened up to even more interference dependent on where you are working on the slope.
Long story short I plucked some nice gold for the effort which made the little lay down later on justifiable. Interestingly I pinged a solid 5 gram chunk in my old scrape from the 5000 days, a boomer signal for the GPZ and not that deep so can only assume the quieter running GPZ 7000 was clearly an advantage in a high EMI area. Just below it I got a nice deep warble that made my skin goose bump and sure enough 16 inches down a 13 gram slugster came to light pushing the mornings total to 23 grams of 97%-98% Clermont golden goodness. Considering I spent 2 weeks in WA this year without a piece of gold this was pure heaven especially since I have more signals to investigate over the next few days.
The GPZ still continues to amaze me, if only it was lighter and more manageable so that other people could tap into its potential more fully. The weight really does detract from good detecting practices with this technology. The Super D coils really do need to be kept above saturation effect for maximum depth on the deeper pieces, the coil sweep also needs to be evenly controlled, all vital methods that are are adversely impacted upon due to too much outright weight for the average user.
In my idle time I often read posts that I may have passed on when they were fresh. I don't recall seeing this mentioned on this forum.
It is quite a long trip to shop but hey....just to visit with Jonathan and family would be worth the cost.
Congratulations JP and Frieda; may your cash-drawer always be full!