By Mike Dawson
Editors Note - this thread was split off from a previously existing topic.
I already knew your comments were for your own personal use but if you did not want people to comment on them why post them in the first place? That Aussie guy on youtube also had a sdc 2300 so he was no dunce with Minelabs but it just did not work for him or just had too high expectations.I also respect his right to express his feelings publically as we live in a free society- in Australia anyway. I would quickly have criticised the Impact on any forum if it did not meet my expectations,but there is nothing to criticise except the headphone jack which protrudes too far out from the main housing and can be easily stepped on and the cord is too long.Maybe Minelab could have made the GM 1000 easier to use on goldfields just like my Impact.In my experience there is no smoke without fire.There has not been one post on how the Impact performs on goldfields except mine on any forum and I feel that is a real shame as that is where it excels. I am sure the Impact not only works for me but for plenty of other people too.I found it a little heavy to start with but after a few days with my new arm muscles it seemed light and very well balanced for me anyway and I am getting on, so it would also suit other novices and retirees.There is certainly a lot of resistance towards the Impact in Australia. eg. no Impact tests in the world or Australia in 2 months on goldfields since it came out, but when the GM 1000 came out there were posts about it in goldfields that week.
By Mike Dawson
Got delivery of a Nokta Impact detector early June after it was unpacked by Nokta at the shipping point and the latest software version installed and then repacked.Two week delay but worth it.First impression of the unit on the first day of use was one of amazement on how stable it was on our very heavily mineralised ground on our goldfields.I had reservations before that it would be tough going for the Impact but happily these did come to reality.The auto GB was very easy to do and the unit only needed to re balanced every 15 minutes just to make sure.I would recommend this procedure in very heavily mineralised soil. On the second day I was mostly using the GEN mode and on the fourth day I got sick of digging up all the hot rocks and turned up discrimination in GEN mode to its minimum setting of 01.That way I got normal tones when sweeping at normal speed on hot rocks but when checking out the signal and sweeping slowly I got the iron low tone.As a novice user I did not have to change the settings except to increase the frequency to 20 Khz more suited for gold,as the settings are optimized for each mode.Isat setting was left at default of 06 and gain at 70.In the discrimination modes the extreme patches of mineralisation which were 2 feet in diameter gave a target response,but in GEN mode these came up as a broad patch and not a spiked signal so were clearly not genuine targets.It may be possible to eliminate this target response in the disc. modes by altering the settings so I would appreciate getting any feedback from other prospectors on this subject.This VLF detector is clearly marketed by Nokta as a coin and relic hunting detector for use in parks and on beaches but can also be used on goldfields for hunting nuggets.Fitting the larger 16 inch Im40 coil will give more faster coverage of terrain but in heavily mineralised ground it would not necessarily give greater depth although from previous experience adding a 16 inch coil on an old Whites detector turned it into a mean nugget hunter in the days when larger nuggets were still plentiful..Further I would like to point out that higher frequency machines are better for finding sub gram nuggets but in heavily mineralised ground are more unstable.Fitting large coils on these machines may incur penalties such as higher instability in these conditions.I did encounter a huge patch of extreme ground on top of a hill only once in 30 odd hours of detecting but switched the unit to COG mode.Unfortunately I could not continue in COG mode as we spent 2 hours on top of this hill and my wife got cold and wanted to leave.I had found a 1/4 and 1/2 oz. nuggets on top of this small hill previously with an old Whites detector so must investigate this patch further with the COG mode.This hill produced lots of surface nuggets during the goldrush and the west side has been surfaced down to bedrock on the top and to pipeclay on the side of the hill,so basalt lying on top of pipeclay.Further south towards a small town called Dunolly there are numerous shallow gullies which produced lots of large nuggets and also dozens of gold reefs.Even further south just north of a large town called Maryborough there are diggings at Simons where diggers had to penetrate a layer of basalt to get to the numerous nuggets which were lying on top of pipeclay.A large nugget was found near Dunolly 2 months ago by a prospector which was about 4 kilograms in weight.At Maryborough there is a main street full of shops built over the main lead which is estimated to still contain lots of gold.At Wedderburn a town at the northern tip of the Golden Triangle residents ripped up the main street in the 1950,s looking for gold.Such is gold fever.
I included release date in title so maybe to help avoid confusion for folks later on
By Ricardo P.
I'm still considering acquiring my first metal detector. My main target would be gold nuggets in an area where gold has been mined before for millennia and there are plenty quartzite veins in granite rocks and a good number of small winter creeks. However I would like to also use my detector on nearby beaches and finding coins and relics is also a possibility around here, because of a rich historical background. So I guess I would need a solid all-rounder with could operate on a frequency high enough to make it hot for gold nuggets. It should be priced around the 1000-1250 mark and I cannot justify a second, specialized metal detector.
I recently looked at the Nokta Impact and got interested. Do you think it would fit the bill? What configuration would be more effective? Or are there other alternatives that you might recommend - like the minelab X-terra 705 (my previous favorite choice)?
By Steve Herschbach
On his forum at http://www.dankowskidetectors.com/discussions/read.php?2,121626
This gives a very rare, in fact as far as I know, never before seen inside look at the prototyping process and field test reporting. Thomas Dankowski is a true "engineer nerd" (I say that as a compliment) and so goes to extreme lengths and detail beyond what would normally be seen. His extremely lengthy and copious notes also provide many insights about what to possibly expect from the new Nokta Impact. Keep in mind things changed from the early reports to the final product so things Tom talks about early on change at later dates. Quoting from his thread out of context could cause a lot of misperceptions to arise.
The thread well illustrates something I have observed for some time. When it comes to max depth, standard single frequency induction balance detecting technology is tapped out. Look at the struggle to obtain not another inch but even just another 0.1 inch of depth. The main advantages have come as of late in recovery speed and the ability to separate closely spaced targets. Max depth however is at a standstill. Tom's testing just confirms what I have been seeing for years. It is near impossible to discern more than hair splitting differences for max depth between most top of the line VLF detectors these days.
And now a Report on the Nokta Impact from Keith Southern
And a Report From Ziggy
Report from Lawrenzo - Low-Boy/LCPM
Report from tnsharpshooter
Report from goodmore
Report from Sven1
By Steve Herschbach
The Makro and Nokta 9.5" x 5" DD closed elliptical design has been discontinued in favor of a open style design for the Impact, the IM24. The new design is not bouyant like the old design and so will be popular with water hunters in particular. Part numbers for the new coil are available for other Makro and Nokta models There is also a new 5" round coil for the Nokta Impact.
RC24 Black 14 kHz - Racer 1 (Red Racer) and Racer 2
FC24 Black 15 kHz - FORS CoRe
FR24 Black 19 kHz - FORS Relic
FGP24 White 19 kHz - FORS Gold+