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  1. #16
    us
    Hardrock prospector

    May 2017
    Middle Oregon
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    Still learning about this. Thank you both Mad Machinist and StreamlineGold for the information.
    Last edited by Assembler; Dec 27, 2017 at 02:08 PM.

  2. #17
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
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    If the Ore contains small percentage of sulphur desulphurization can be by means of iron nails and is a standard means with a fire assay page 65b assay of so-called refractory ores (manual of assaying Miller).
    Amalgamation and chlorination tests are usually intended to give an approximate indication of the percentage of gold and silver that can be extracted by these methods on a working scale page 82. The mesh size of ore sample for amalgamation is 80-mesh. The mesh size of ore sample for fire assay is 40-mesh. The Chlorination test calls for a "Roast" of sample before the test.

  3. #18
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
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    "Scorification Assay"

    A "Scorification Assay" is often used when there is rich gold and silver ore. The problem with this test is that the "Scorification assay gives higher (uncorrected) results for silver" page 43 Miller. This of course is a type of fire assay.

  4. #19
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
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    Just posted the above to give everyone a idea of what a assayer may be dealing with with different types of rocks. Most people will not be dealing with the volatilization of bad things like sulphur, arsenic, mercury, lead, etc,.

  5. #20

    Apr 2013
    243
    125 times
    All Types Of Treasure Hunting
    Most ore is going to have a least some pyrite in it which can be mixed with arseno..I I have into a lot of ore with a garden variety of chalcopyrite, arsenopyrite, galena mixed with free milling gold. The levels of which made the difference whether it should be considered a complex ore or not.

    Galena (lead sulphide) in particular can run into the hundreds of oz per ton of gold. Its tough to assay those sulfides eat..
    Assembler likes this.

  6. #21
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
    1,372
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    Quote Originally Posted by StreamlineGold View Post
    Most ore is going to have a least some pyrite in it which can be mixed with arseno..I I have into a lot of ore with a garden variety of chalcopyrite, arsenopyrite, galena mixed with free milling gold. The levels of which made the difference whether it should be considered a complex ore or not.

    Galena (lead sulphide) in particular can run into the hundreds of oz per ton of gold. Its tough to assay those sulfides eat..
    Yes. The Galena ore can also run very lean of other values per ton then get much richer per ton as one goes down a "Lode line" of the ore.

  7. #22
    us
    captain

    Dec 2016
    ohio
    bounty hunter time ranger
    123
    76 times
    All Types Of Treasure Hunting
    I know this an older post but thanks to period six for the knowledge base.

  8. #23
    us
    Gold Tramp

    Dec 2012
    885
    1572 times
    Quote Originally Posted by StreamlineGold View Post
    Most ore is going to have a least some pyrite in it which can be mixed with arseno..I I have into a lot of ore with a garden variety of chalcopyrite, arsenopyrite, galena mixed with free milling gold. The levels of which made the difference whether it should be considered a complex ore or not.

    Galena (lead sulphide) in particular can run into the hundreds of oz per ton of gold. Its tough to assay those sulfides eat..
    Dont you mean silver in the galena. I rarely have found galena with gold. But thats in my district.
    Intresting.
    Gt....

  9. #24
    us
    Period Six Mining and Exploration LLC

    Mar 2015
    Sonoran Desert of AZ
    440
    597 times
    Prospecting
    Quote Originally Posted by gold tramp View Post
    Dont you mean silver in the galena. I rarely have found galena with gold. But thats in my district.
    Intresting.
    Gt....
    This is a very odd deposit we're working in Arizona, not like 99% of the state. I'll see if I can dig up the photos we have of the ore we crushed and put under a microscope, but it's running together.

    Here we go, had to hunt it down in our P6 internal archive. One or two of these is better at seeing the cubic nature of the galena in the concentrates.

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    These samples are pretty high grade, but strangely enough we don't have a good one on these samples. We've sent off several on various spots on the patent, but those were more for discriminating what portions of the mineralization were holding values.

    The translucent yellow pieces are mimetite, lead arsenate chloride. Not exactly the sort of stuff you want to make sand castles out of.
    Last edited by SaltwaterServr; May 15, 2018 at 12:16 AM.
    This ain't Michigan, its GOLD COUNTRY!

  10. #25
    us
    Period Six Mining and Exploration LLC

    Mar 2015
    Sonoran Desert of AZ
    440
    597 times
    Prospecting
    I should add, those photos are from what we're pretty sure is linked directly to a distal volcanic massive sulfide deposit. Some of our other properties nearby are proximal VMS/Sedex.
    This ain't Michigan, its GOLD COUNTRY!

  11. #26
    us
    Gold Tramp

    Dec 2012
    885
    1572 times
    I have to ask galena carrying 100 of ounces of gold values.
    Wouldnt you see this in a pan sample ?
    Gt..
    Last edited by gold tramp; May 15, 2018 at 09:07 PM.

  12. #27
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
    1,372
    440 times
    Prospecting
    Quote Originally Posted by gold tramp View Post
    I have to ask galena carrying 100 of ounces of gold values.
    Wouldnt you see this in a pan sample ?
    Gt..
    The crushed samples show mostly crystallized minerals. There could be trace amounts of values in some of the minerals.
    Think one would be better off trying to see if there is free values not locked up with the other minerals. There could be even crystallized gold near by.
    If there is crystallized gold near by this could explain the 100 ounces of gold values in that area. Just do not know.

    Is there enough values to off set the cost of a "Fire assay"?
    Last edited by Assembler; May 16, 2018 at 05:36 PM.

  13. #28
    us
    Period Six Mining and Exploration LLC

    Mar 2015
    Sonoran Desert of AZ
    440
    597 times
    Prospecting
    Quote Originally Posted by gold tramp View Post
    I have to ask galena carrying 100 of ounces of gold values.
    Wouldnt you see this in a pan sample ?
    Gt..
    I would expect so, but the samples we have I'd say are running mixed iron/galena. We'll know the values per ton in the next 3-5 days.
    Assembler likes this.
    This ain't Michigan, its GOLD COUNTRY!

  14. #29
    us
    Gold Tramp

    Dec 2012
    885
    1572 times
    Quote Originally Posted by SaltwaterServr View Post
    I would expect so, but the samples we have I'd say are running mixed iron/galena. We'll know the values per ton in the next 3-5 days.
    Forget the assay just show a pan sample so we get an idea of what the value size is.
    If theres gold in the sample no matter how small one can still see it in a pan.
    If you do a simple grind in a mortar. You can release all these values.
    Then just pan.
    That way we can see what comes out first hand with eyes.
    Pan samples always come before an assay at least in this miners world. Heck if you see yellow just go dig it out.
    Thanks
    Gt....
    Last edited by gold tramp; May 17, 2018 at 11:37 AM.

  15. #30
    us
    Hardrock prospector

    May 2017
    Middle Oregon
    Whites, Fisher, Garrett, and Falcon.
    1,372
    440 times
    Prospecting
    Would be interesting to grind each mineral separately and then pan for values to get a better idea what is best.
    For sure grind spots all along the mineral zone looking for values.
    Last edited by Assembler; May 17, 2018 at 04:32 PM.

 

 
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