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Offline wreaksTopic starter
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« on: December 19, 2009, 01:05:36 pm »
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Hello, I am very new here but I have been in treasure hunting for most of my life.

I have found what looks like an impact crater deep in the forest, and I was hoping to possibly rent a GPR for say a week and hopefully get the hang of it and determine if there is anything in this crater.

I see a few sites that offer systems like the SIR3000 for rent, just from what I have read, angle of impact and measurements done on site I think the object is no deeper than 30 feet.

I don't think even the best PI can go anywhere near that deep so I think I am stuck with a GPR of some type, has anyone ever rented one/ can recommend one that is not to hard to get the hang of.

I have extensive experience with electronics and computers and can usually pick up on how things work very quickly....

Thank you for your time.

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Offline GoldDigger1950
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« Reply #1 on: December 19, 2009, 04:03:55 pm »
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How old does it look to be?

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #2 on: December 23, 2009, 08:10:21 pm »
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crater looks very old....

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Offline GoldDigger1950
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« Reply #3 on: December 23, 2009, 09:58:03 pm »
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"Very" is far too subjective  a description. Estimate the age. Just pretend this is a serious inquiry.

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« Last Edit: December 24, 2009, 12:04:35 am by GoldDigger1950 »
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« Reply #4 on: December 23, 2009, 10:43:24 pm »
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GPRs are not cheap to rent. Before investing money in one, I'd suggest you evaluate the soil in the crater first.

1) Take soil core samples for 20 feet and have the samples analyzed for clay content. A high percentage of clay will reduce the penetration of the GPR to as little as a few feet. An honest/knowledgeable rental company will be able to tell you if the GPR can perform in a worthwhile manner on that soil.

2) Dig down 5 or 6 feet following your projected path of the object and examine the soil. Are there many rocks, shards of metal and other debris? If there's too much clutter, you'll get a lot of spurious reflected echos. It takes a trained GPR operator to interpret and sift out the relevant info.


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« Reply #5 on: December 27, 2009, 03:16:48 pm »
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soil disturbance age looks to be over a thousand years, comparing the pictures I have seen with the area in question.



Clay is pretty common in the area, high moisture content in the soil will reduce the effectiveness of the GPR as well correct?

I will see about getting a core sample, the area is not...easily accessible until summertime anyways so got a bit of time to research.


On GPR rentals I see SIR 3000s rentable for around 120-150 per day from environmental supply and pulseEKKOs for 160 per day from apollo geophysics, that seem reasonable?

Thank you for the input so far, appreciate it.

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Offline GoldDigger1950
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« Reply #6 on: December 27, 2009, 03:30:15 pm »
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Wreaks, with the GPS coordinates of the site (which I assume you have), go to Google Maps and use the satellite imaging to give you an idea of the impact shape. If it's perfectly round, the impact is most likely to have been nearly vertical. If not, the shape might indicate it was a glancing impact meaning that the meteorite could be miles away from the crater. In any event, there are formulas available to calculate the ejecta patterns from both kinds of impacts. Rather than place your hopes on a large piece remaining in the crater, see how many smaller chunks are around the crater in the ejecta area. In most cases, a pattern will emerge and tell you if enough mass was ejected to indicate the entire meteorite exploded and was ejected and indicate if a larger piece is still left.

Research is the key here before you go off renting any equipment. Keep the site location secret for now. Meteorites are worth several hundred dollars per kilogram and you'll be swamped with "helpers" if you reveal your location prematurely.

Keep good records. Draw a crater image and keep track of the finds around it. Record the mass, distance from the center impact area, general shape and a photo of each find. It could take you years to do the actual searching of the area but you may find yourself with a pile of rocks worth the effort. It also makes a grand story to tell your family afterward.

Good luck.

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« Last Edit: December 27, 2009, 03:33:21 pm by GoldDigger1950 »
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« Reply #7 on: December 27, 2009, 04:16:54 pm »
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You make a good point on the glancing blow, I will have to do a bit more research to determine that this wasn't the case. Thanks for the insight GD.

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Offline GoldDigger1950
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« Reply #8 on: December 27, 2009, 04:28:45 pm »
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Wreaks, those of us who hunt for all kinds of treasure learn all sorts of things along the way. Try the Google Maps thing. Even if it's now heavily forested, you might still find a clue. Perhaps a mile away you might spot an even bigger crater and discover that yours is a piece of ejecta from that much bigger strike. You just never know.

I sold a round, nickel/iron core meteorite the size of a walnut on eBay for $450.00 a few years back. The size and shape indicated it was a solo fall. It was found resting on the surface and spotted by eye. I wasn't even looking for a meteorite but I liked the shape and color of the rock. It was very heavy for its size and I pocketed it. Years later, I looked at it again with a new eye.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #9 on: December 27, 2009, 11:39:11 pm »
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If I had some pieces, where or who could I take it to/ send it ? Is it something you can determine on your own or could a local rock shop figure it out?

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