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ACE 250 and meteors

A

azdigger

New member
I have discovered that no matter what I set my 250 at I can't get it to pick up a meteor.
I had a different machine and it would read the meteor with no problem.
The meteor has some nickle content and I thought it shout sound off.
even is attracted to a magnet.
Any thoughts on this or how to solve it ?
 
Yep, it fails to pick up the meteor in any mode....the meteor will jump right up onto a magnet and my pinpointer will pick it up but not the ACE 250
 
Does seem a bit weird... I'd think it would ring
up if it's really got metal in it.. Wonder if the
pinpoint mode picks it up? The only thing I could
think of is if the metal falls outside of the calibrated
range for the certain metals, but even that doesn't
really make sense. I would think it should be hitting
at least in the low range of the scale "iron, gold", etc
if it's got iron or nickle. Seems to me the ID scale
of the 250 should cover most all common metals. I'd be
pretty surprised if the pinpoint mode doesn't pick it up,
and it's known to have metal. IE: the magnet and pinpointer
are pretty good indicators it's got metal in it. It oughta
be hitting at least in the iron end of the scale I would
think. The pinpoint mode is true all metal, non motion. It
should pick it up if it's got metal.
MK
 
How long does it take to hear back from Mary, I sent her an Email on Sunday evening about this.........
 
I know it is a meteorite, it was a gift from a meteor hunter who has a vast collection and had many classified by the university. My minelab picked it up no problem, bad thing is I sold my minelab thinking the 250 was gonna be my favorite and other than not picking up meteors it is.
I might just have to save up and get an Xterra 70 and give the 250 to my wife
 
I guess I might be a little in a hurry to get an answer but I have yet to hear from Mary about my 250 not picking up meteors.
I hope I get some responce soon, I am supposed to go out meteor hunting but not with this machine.
 
Email her again or call her direct. What are you entering in the subject line in your email? She gets a ton of email everyday from all over the world.

Bill
 
Who did you try to contact? I emailed Mary and got an answer right back. According to her she never received an email from you.

Bill
 
Can you give me her email address to make sure I am sending it to the right place....I ain't perfect so it could have been sent wrong.

I was going to go meteor hunting this weekend but no need to go if I can't find them.
 
Mail Sent again, I think I got it right this time.
Thanks for the address.
 
Also, since you are in Arizona, you may be searching for a Stony chondrite (???). They are low iron (LL). The chondrules are the small, but prominent rounded sperical darker colored "condrites" that are usually of pyroxene and olivine minerals.

The "metal" content is nickel-iron. If you cut a flat surface across your sample you will see small satiny/silvery paricles of nickel while viewed in good light with a good 10x loupe.

Being low iron they are weakly magnetic. They will react as do the terrestrial "hot rocks" commonly found in the all metal mode of a metal detector. Back years ago the gold detectorists were throwing
"hot rocks" into the brush. But some of the "hot rocks" were actually
low iron Stony chondrites. For the 250 to find a LL Stony chondrite it needs to be set to find "hot rocks." No discrimination, and possibly just a low signal.
 
Hi azdigger,
I think something is not quite right.
I have a small meteorite and I tested it with an Ace 250.
I set the unit in all metal and swung the coil over it.
Got a good signal with a reading on the lowest cursor.
Swung the coil very fast over the target and still picked it up.
Now there could be several things that may be happenning.
You must make sure that it is in the All Metal Mode, otherwise you will not detect it.
It may not be a meteorite but a piece of ironstone. We have iron stone over here that look like meteorites, but aren't.
They can be picked up with a magnet easily and with many detectors, they can still give an indication as a target. This is why they are commonly known as "Hot Rocks".
So a magnet is no test for it being a meteorite.
Garretts units are generally set up so they can try and eliminate these types of stones.
The way to test it, is to check it with one of the old Garrett ADS Deepseeker, Groundhogs or the current Scorpion Gold Stinger.
Have the threshold just audible and have the unit in the TR mode with zero discrimination.
In this setup, Garrett have calibrated the units in this mode, to identify mineralisation such as hot rocks, etc.
Just pass the target past the coil. if the threshold stays constant or decreases, then it is only a high mineralised rock. If the audio increses, then further investigation of the rock is needed.
If it does increase, then it may be a meteorite, probably a nickle iron composition.
Tektite meteorites will not give a response to any detector as they do not contain any metalic material.
In regards to not getting a reply back from Mary at Garrets, it seems a bit strange.
I sent an email last night, Australian time, and had a reply from her this morning. Is it possible you have the email address incorrect.
Hope this helps out.
Regards,
Phil
 
Howdy philst... You have summed it up. I have posted above in this thread and suggested checking out the "meteorite" by filing and using
a loupe to check for nickel. Somehow, I feel the rock may be a hot rock. Most of the low iron Stony condrites as found in Arizona (I'm assuming it is) are more weakly magnetic. They contain very little "Metal" content and can easily hide amongst the other rocks.

Also, philst... you certainly get around.(GRIN)
 
Now I will add more. My youngest granddaughter who stays wirh has
my 250 in her room. This morning I got it and tested several LL (low)
iron Stony-chondrites from the fall in north-western Arizona. They would not "beep." I suspect the 250 (as other presets) even in all-metal will not beep the low metal (iron/nickel) content. Stony- chondrites contain small amounts of "metal."

Stony chondrites are the most common/fall find. But they can be most inconspicuous as they can "hide" amongst the county rock. They can be
designated as (H) for high-iron; (L) for low-iron; and (LL) for low-"metal"/and free iron content.

This is in no way a put-down on the 250. Actually the "stones" are
difficult to beep. They are not easily found with many VLF-type
gold machines. Usually while out nuggethunting with a gold machine
in the ground-balanced manual all-metal mode; a meteorite sounds
like a "hot rock." (Expensive gold machines if setup to ignore a hot
rock will not detect a low metal Stony chondrite.)The 250 does fine with the Irons and Stony-Irons.

If anyone reading this (my) post has anything more pro or con; please
do... this is how we learn! The more I try to learn, the less I find
I know.
 
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