collapse


* User Info

 
 
Welcome, Guest. Please login or register.
Did you miss your activation email?

* Who's Online


Dot Guests: 235 | Dot Users
Dot Hidden: 0

* Board Stats

  • stats Total Members: 13016
  • stats Total Posts: 131029
  • stats Total Topics: 18328
  • stats Total Categories: 5
  • stats Total Boards: 48
  • stats Most Online: 814

* Advertisers

Mining Claims
Gear Pan
The lil Gold Spinner
BC GOLD
The lil Gold Spinner
The Pocket Sluice

Author Topic: Hello everyone...any idea what this could be  (Read 222 times)

0 Members and 2 Guests are viewing this topic.

Offline Yogicell2009

  • Member
  • **
  • Posts: 6
  • Province/State: Ontario
  • Country: ca
  • Kudos: 0
Hello everyone...any idea what this could be
« on: December 02, 2019, 01:08:42 PM »
Was at southern end of lake Ontario , between Hamilton and St.Catherines
They are using Hugh rocks like this as a break wall,   It took these rock from the escarpment in the Hamilton area...Any ideas which would cause this to form like this....

Thanks

Offline Yogicell2009

  • Member
  • **
  • Posts: 6
  • Province/State: Ontario
  • Country: ca
  • Kudos: 0
Re: Hello everyone...any idea what this could be
« Reply #1 on: December 02, 2019, 01:11:03 PM »
Ops forgot the picture

Offline jobinyt

  • PPT Invited
  • *****
  • Posts: 397
  • Kudos: 21
Re: Hello everyone...any idea what this could be
« Reply #2 on: December 02, 2019, 04:37:07 PM »
Hopefully you'll get something more definitive than I have but -

1) can you identify the host rock?

2) Does it appear to be a surface contamination - lots of steel industry around there - or does it appear to have been an inclusion in the rock?

3) It looks like iron rust. Rust - iron oxide - isn't magnetic, but that central blob likely contains virgin/un-oxidized material. If iron it would be attracted to the little super magnet you carry for testing such things. If not magnetically - or only weekly  - attracted by the magnet, take a few nodules for analysis

Offline JOE S (INDY)

  • PPT Invited
  • *****
  • Posts: 1300
  • Province/State: Trapper Creek, Alaska with Winters in Idaho
  • Country: us
  • Kudos: 80
  • Wiser Mining Through Endless Personal Mistakes
Re: Hello everyone...any idea what this could be
« Reply #3 on: December 02, 2019, 05:52:55 PM »
Job,

Point #3 -

Not so where I mine.  Iron Oxide ("rust") either natural or man made is quite magnetic as would, of course, any elemental Iron (Fe).

Iron Pyrites themselves are not magnetic - however - roast them over an open fire ("in an abundance of available Oxygen")  and the resulting FeO2 is magnetic.  I often use Neodymium magnets to pull out the magnetics from "super concentrates.

In fact, I did a quick write-up for another (unrelated) Gold Mining Forum and here that post is:

If you haven't tried a Neo Magnet (Neodymium is the actual name) as part of the process for pulling out the Hematite and Magnetite then life will get better if you do.

Neos are sometimes technically mis-identified as "Super Magnets" but even so they are incredibly powerful and can be used to pull Magnetite easily, Hematite with some difficulty and, of course, iron and any other mineral / element that has an affinity for really strong magnets.

2 tablespoons of fine cons in 1" of water in your pan. Pan firmly sitting flat down on the table top and 'flat shake', (slide back and forth or circularly swirl and stratify the whole mess - putting the Gold on the very bottom of the pan. Then put the Neo (I use the N-52 strength, which is the strongest available for sale currently) inside a plastic pill bottle with a bolt head stuck to the top of the magnet.

CAREFULLY! slip the Neo with a 2-4" bolt attached into the plastic bottle, then hold the bottle just above the water while slowly wiggling the bottle/magnet back and forth over the top of the water. 

Slowly lower the bottle while wiggling until the magnetics just start to rise up through the water (kind of like a reverse water fall). Go Slowly! At that point the Magnetite is being stripped from the top of the Gold and sticking to the bottom of the plastic pill bottle. The Gold is all the way under the black sand so it just sits there on the very bottom.

Move the magnet/bottle/bolt and magnetics over to a second pan with 1" (2.5cm+) of water and use the 2"-4" (5-10 cm)  bolt to drag the magnet up and away from the magnetics. Blacks stuff drops. Flat Shake and Repeat until no more Magnetite sticks to the bottle from the first pan. Do not pull up a lot of the black sands at one time!

THEN GET SNEAKY.

Pull the magnet out of the pill bottle and put it into a Baggie. Flat shake and drag the magnet (in the baggie) directly across the remaining black sand (Hematite). The Hematite is *slightly* magnetic and will stick to the magnet through the very thin baggie. Drop the Hematite into the second pan as well with the other magnetics. REPEAT. When done there will be a very little bit of "stuff" in amongst the gold and that pans off quite easily.

If you succumb to the theory that the black sand will, somehow, sweep Gold up to the magnet (so it ends up in the second pan) just do it all over again from Pan #2 to a third pan. See how much Gold you actually pulled from pan 1 to pan 2. 

Get "stuff" directly onto the magnet? Let it dry and use any type of dry sticky tape (scotch, masking, painter's, electrical, box or even duct tape) to remove the dry sands from the magnet. :o

Works like an 8 day clock!

My favorite source for Neodymium magnets on the internet is:    https://www.magnet4sale.com/neodymium-magnets/

I've been doing that for years and it works really, really well.

Joe
Wiser Mining Through Endless Personal Mistakes

Offline jobinyt

  • PPT Invited
  • *****
  • Posts: 397
  • Kudos: 21
Re: Hello everyone...any idea what this could be
« Reply #4 on: December 03, 2019, 02:07:20 PM »
That's interesting. I did some research based on your comment. I had made some invalid generalizations from other knowledge. Glad  I learned that - thanks Joe. I'd always thought the rust I collected on a magnet was because some un-oxidized iron remained in the material. It turns out that rust (FE2O3 - aka hematite) is paramagnetic - that is, it is weakly attracted to a magnet. It also turns out there are quite a few iron-oxygen chemicals - magnetite (Fe3O4) being another that is well known . Iron/oxygen magnetic properties vary widely.

Then there are chemicals involving other elements too such as limenite (FeTiO3 of which I once upon a time found a large deposit), and siderite (FeCO3).  Siderite is interesting as it is generally non-magnetic but becomes attracted to a magnet after being heated - a highly reliable test. You shouldn't ignore siderite as it is  sometimes found on top of deposits of other minerals, but so far I've had luck attracting exploration interest to a siderite outcrop. So, don't get too excited if you find a siderite outcrop - but if it's previously unknown you may get some interest.

"Black sand" is an even more varied and complex substance - and may itself be valuable quite aside from any gold values it contains. Black sand  - strongly magnetic, or not, may contain values, some of which can be worth much more than gold. Anyone finding a lot of black sand in their gold placer would be wise to do some analysis. To start, easily conducted "flame tests" and fusion tests are something you can do yourself.

Anyhow, I've gotten off topic. Looking at the little nodule in Yogi's picture - a couple pieces of that is sufficient for a flame test.

Offline geezir

  • Sr. Member
  • *****
  • Posts: 314
  • Kudos: 44
Re: Hello everyone...any idea what this could be
« Reply #5 on: December 03, 2019, 09:27:05 PM »
Was at southern end of lake Ontario , between Hamilton and St.Catherines
They are using Hugh rocks like this as a break wall,   It took these rock from the escarpment in the Hamilton area...Any ideas which would cause this to form like this....

Thanks

"They are using Hugh rocks like this as a break wall"
The Niagara Escarpment formed because the Lockport Dolostone (Dolomite) is much harder than the underling  easily eroded shale rocks.  The rock is likely dolomite being durable for use in a break wall. It also looks like dolomite.  The area dolomite has small pockets of mineralization and fossils from the old seas. 

 


Gear Pan
Gold Rat