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View Full Version : Update on O'Connor Creek Mine, Fairbanks Quadrangle, Alaska



Bill Bohan
09-21-2012, 12:14 PM
Prospective buyer Alan Gering ran a back hoe out to O'Connor Creek. He followed up on the man shoveled prospect pit dug last summer. If you recall the the test pit had been dug over a magnetic anomaly done with a DGGS fly over (see published rainbow maps for this area). The anomaly is shown in the pictures and map topo below.


http://img.photobucket.com/albums/v351/Bilbo907/OConnorCreekmagneticMapsamplelocation_zps2cd11cca. jpg


Here is a picture of last years pan from a shoveled prospect pit. This is dike intrusive gold. It is of fine mesh, however its tenor is in probably in the 90's . This is fine gold, but is also very coarse gold. These elluvial are suspended in permo rot over the decaying load deposit.

http://img.photobucket.com/albums/v351/Bilbo907/OConnorCreekGoldfromtheUpperBench_zps12963767.jpg

Two trenches were dug over the magnetic anomaly with a back hoe. The trenches were a hundred yard apart.

Upper trench: Here Ken Sr. and Buck Bedford are pan sampling the cut
http://img.photobucket.com/albums/v351/Bilbo907/OC18_zpsbf80c287.jpg

http://img.photobucket.com/albums/v351/Bilbo907/OC15_zpsb1a2de27.jpg

Pictures of Lower Treench:

http://img.photobucket.com/albums/v351/Bilbo907/OC20_zps49fa7694.jpg


Note laterite soils
http://img.photobucket.com/albums/v351/Bilbo907/OC21_zpsf0857829.jpg

Fine gold was retreived in the majority of pans from both these trenches

Bill Bohan
09-21-2012, 12:32 PM
These nine mining claims are for sale. Contact me at trampminerllc@hotmail.com if your interested in going out to sample the trenches.

Locating of trenches: You can drive to the sample site.
http://img.photobucket.com/albums/v351/Bilbo907/OConnerCreekMinesamplelocation_zpsc474ece4.png

Owner running a pan test. Clay is prevellent over these dike deposits
http://img.photobucket.com/albums/v351/Bilbo907/OC19_zpsef341a20.jpg

Reno Chris
09-21-2012, 10:00 PM
Interesting stuff. Did you get any feel for the source of the maroon bedrock and what that was?

Bill Bohan
09-24-2012, 06:32 PM
I am hoping the maroon elluvials are from sulfides that are more reduced than oxidized. The magnetite/ illmenite quantities per pan is tremenous hence the mag signature. There is Altered intrusive igneous dike rock in the pits piles too.

Reno Chris
09-24-2012, 07:20 PM
Take a look at the cons under magnification. If there are significant sulfides, you will see them or at least oxidized versions of them in those concentrates (normally in the form of lots of little limonite cubes after pyrite). Just in the cons pictured, I don't see much sign of that.

geowizard
09-25-2012, 12:20 PM
Bill,

"Prospective buyer Alan Gering ran a back hoe out to O'Connor Creek. He followed up on the man shoveled prospect pit dug last summer. If you recall the the test pit had been dug over a magnetic anomaly done with a DGGS fly over (see published rainbow maps for this area). The anomaly is shown in the pictures and map topo below."


Magnetic anomalies are not where they appear to be. It's like if you hold a magnet at an angle, 6" under a piece of paper and move a compass over the top. The magnetic flux emanates through the paper at a point away from the magnet. EM anomalies are on target.

So, what happened to Alan?

- Geowizard

Bill Bohan
09-25-2012, 01:52 PM
This is a fairly low fly over combined with a upper bench near bedrock signature
(permo bedrock is exposed in trench).

Dipole signature drift as you speak of Wiz, would have to be considered if the permo elluvials were accummulated beneath deeper gravels or more towards a basinal valley.

Magnetic drift was anticipated , but was hindsite. The discovery was made before the magnetic map was studied. The mag map allowed the geologist to anticipate an apparent demension of the deposit.

The pan samples are heavily laden with magnetite and illmenite and stibnite.

Alan is waiting for his assays to return before he negotiates. He does have first "no". The claims have been relisted on Fairbank's Craigslist as of this afternoon.

Bill Bohan
09-25-2012, 01:55 PM
Good point on the pyrite relics Chris. Maybe Maroon-ish leeching is hematiite on a variation of MnO2?